JP2005094349A - Information processor and information processing method, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To freely change a device for performing radio communication and to prevent a cryptographic from being known to a user. <P>SOLUTION: When the user operates a switch 94, a CPU 41 sets an operation mode in a transmission mode for transmitting a WEP (Wired Equivalent Privacy) key. In the transmission mode, a radio transmitting/receiving module 92 transmits key information about the WEP key to a receiving part 31. Also, when the user operates a switch 104, the switch 104 sets an operation mode in a transmission mode. In the transmission mode, a radio transmitting/receiving module 101 receives the key information transmitted from the radio transmitting/receiving module 92. This invention is applicable, for example, to a wireless television. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information processing device, an information processing method, a program, and a recording medium, and more particularly, to an information processing device, an information processing method, a program, and a recording medium that perform wireless communication.

  For example, in IEEE (Institute of Electrical and Electronic Engineers) 802.11 wireless communication, an encrypted communication protocol called WEP (Wired Equivalent Privacy) is used to keep communication between the transmitter and the receiver confidential. The transmission data is encrypted (and decrypted).

  For communication of personal computers such as e-mail, the user sets an encryption key called a WEP key on the access point side, and the WEP key set on the access point side for a personal computer that needs to communicate with the access point. The method of setting the same WEP key as is common.

  AV data is also encrypted with a WEP key when AV data is transmitted and received in an AV (Audio Video) device by performing wireless communication of the IEEE 802.11 standard. This is to prevent the AV data of content restricted by copyrights recorded on DVD (Digital Versatile Disk) etc. from being intercepted and stored by a personal computer etc. This is to prevent being done.

As a method of creating an encryption key used for encryption, a method of creating an encryption key by using information unique to a wireless device such as a manufacturing number or a MAC (Media Access Control) address at the manufacturer or distributor of the wireless device. Has been proposed (see, for example, Patent Document 1). In addition, the transmitter and the receiver communicate with each other and exchange a unique ID (Identification) set in advance, and the transmitter and the receiver are preset in the exchanged ID and the own device. A method of creating an encryption key using a secret program is devised (see, for example, Patent Document 2).
JP 2003-110543 A International Publication Number 98/01975 Pamphlet

  When AV data is transmitted / received by performing wireless communication of the IEEE 802.11 standard in an AV device, the AV data is used with a WEP key so that the AV data of the copyrighted content recorded on the DVD or the like is not intercepted. Therefore, the user cannot freely set the WEP key on the transmitter side, which is an AV device that transmits AV data. This is because if the user can freely set the WEP key on the transmitter side, the user must set the same WEP key on a personal computer that is not a receiver that is an AV device that receives AV data. This is because the AV data transmitted by the transmitter can be intercepted and stored.

  For this reason, the same WEP key is set (set) at the time of manufacture in the transmitter and the receiver of the AV device that performs wireless communication, and the transmitter and the receiver are paired and shipped.

  As described above, when the WEP key is set at the time of manufacture, the user can exchange AV data only between the paired transmitter and receiver, and therefore only the transmitter or the receiver can receive the AV data. It was difficult to replace or buy only the machine. That is, when the receiver paired with the transmitter is, for example, a 15-inch TV (television receiver), a 32-inch TV as a receiver paired with another transmitter is used. For example, when a transmitter paired as a receiver is a BS (Broadcasting Satellite) tuner, for example, an HDD (Hard Disk Drive) recorder as a transmitter paired with another receiver It is difficult to change only the transmitter or only the receiver when it is desired to receive a stream transmitted from the HDD recorder. Therefore, the user cannot freely change the transmitter and the receiver, and there is a problem that it is difficult to meet the user's request.

  The present invention has been made in view of such a situation, and an apparatus for performing wireless communication can be freely changed, and an encryption key used for encryption and decryption of data exchanged by the wireless communication. Is not made known to the user.

  In the first information processing apparatus of the present invention, when the operation mode is set to a transmission mode for transmitting an encryption key used for data encryption or decryption, and when the transmission mode is set by the setting means, Transmitting means for transmitting encryption key information relating to the encryption key.

  The setting means can set the operation mode to the transmission mode in accordance with the operation of the mechanical switch.

  When the power is turned on, the setting means sets the operation mode to the transmission mode, and after the encryption key information is transmitted by the transmission means, the operation mode is changed to the normal mode in which the data is encrypted or decrypted using the encryption key. Can be set to

  The encryption key information may be a value obtained by multiplying the first value that is a prime number and the second value that is a prime number including the encryption key.

  The encryption key information can be a remainder obtained by dividing a multiplication value of the first value that is a prime number and the encryption key by a second value that is a prime number.

  The transmission means can transmit the encryption key information wirelessly or by wire.

  In the first information processing method of the present invention, the operation mode is set to a transmission mode for transmitting an encryption key used for data encryption or decryption, and the transmission mode is set by the processing of the setting step. And a transmission step of transmitting encryption key information related to the encryption key.

  In the first program of the present invention, when the operation mode is set to a transmission mode for transmitting an encryption key used for encryption or decryption of data, and when the transmission mode is set by the processing of the setting step, A transmission control step for controlling transmission of encryption key information related to the encryption key.

  The program recorded on the first recording medium of the present invention includes a setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for data encryption or decryption, and a transmission mode by processing of the setting step. And a transmission control step for controlling transmission of encryption key information related to the encryption key.

  In the second information processing apparatus of the present invention, when the operation mode is set to a transmission mode for transmitting an encryption key used for data encryption or decryption, and when the transmission mode is set by the setting means, Receiving means for receiving encryption key information relating to the encryption key.

  The setting means can set the operation mode to the transmission mode in accordance with the operation of the mechanical switch.

  When the power is turned on, the setting means sets the operation mode to the transmission mode, and after the encryption key information is received by the reception means, the operation mode is changed to the normal mode in which the data is encrypted or decrypted using the encryption key. Can be set to

  The encryption key information may be a value obtained by multiplying the first value that is a prime number and the second value that is a prime number including the encryption key.

  The encryption key information can be a remainder obtained by dividing a multiplication value of the first value that is a prime number and the encryption key by a second value that is a prime number.

  The information processing apparatus may further include storage means for storing the encryption key obtained based on the encryption key information received by the receiving means in association with the device that has transmitted the encryption key information.

  The receiving means can transmit the encryption key information wirelessly or by wire.

  In the second information processing method of the present invention, the operation mode is set to a transmission mode for transmitting an encryption key used for data encryption or decryption, and the transmission mode is set by the processing of the setting step. And a reception step of receiving encryption key information related to the encryption key.

  In the second program of the present invention, when the operation mode is set to the transmission mode for transmitting the encryption key used for data encryption or decryption, and when the transmission mode is set by the processing of the setting step, A reception control step for controlling reception of encryption key information related to the encryption key.

  The program recorded on the second recording medium of the present invention includes a setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for data encryption or decryption, and a transmission mode by processing of the setting step. And a reception control step for controlling reception of encryption key information related to the encryption key.

  In the present invention, when the operation mode is set to a transmission mode for transmitting an encryption key used for data encryption or decryption, encryption key information related to the encryption key is transmitted.

  In the present invention, when the operation mode is set to a transmission mode for transmitting an encryption key used for data encryption or decryption, encryption key information related to the encryption key is received.

  According to the present invention, it is possible to freely change a device that performs wireless communication without the user knowing the encryption key.

  Embodiments of the present invention will be described below. Correspondences between constituent elements described in the claims and specific examples in the embodiments of the present invention are exemplified as follows. This description is to confirm that specific examples supporting the invention described in the claims are described in the embodiments of the invention. Therefore, even if there are specific examples that are described in the embodiment of the invention but are not described here as corresponding to the configuration requirements, the specific examples are not included in the configuration. It does not mean that it does not correspond to a requirement. On the contrary, even if a specific example is described here as corresponding to a configuration requirement, this means that the specific example does not correspond to a configuration requirement other than the configuration requirement. not.

  Further, this description does not mean that all the inventions corresponding to the specific examples described in the embodiments of the invention are described in the claims. In other words, this description is an invention corresponding to the specific example described in the embodiment of the invention, and the existence of an invention not described in the claims of this application, that is, in the future, a divisional application will be made. Nor does it deny the existence of an invention added by amendment.

  The information processing apparatus according to claim 1 (for example, the reception apparatus 12 in FIG. 1) is an information processing apparatus that transmits or receives data wirelessly, and an operation mode is an encryption key used for encryption or decryption of the data. A setting unit (for example, the CPU 81 in FIG. 6) that sets a transmission mode for performing transmission, and when the transmission mode is set by the setting unit, transmits encryption key information (for example, a multiplication value s) related to the encryption key. Transmission means (for example, the wireless transmission / reception module 92 in FIG. 6).

  The information processing apparatus according to claim 4, wherein the encryption key information includes a first value that is a prime number (for example, a prime number p) and a second value that is a prime number that includes the encryption key (for example, a prime number q). And a value obtained by multiplying (for example, s).

  The information processing apparatus according to claim 5, wherein the encryption key information includes a multiplication value of a first value (for example, a prime number t) that is a prime number and the encryption key (for example, a WEP key v) as a prime number. It is a remainder obtained by dividing by a certain second value (for example, a prime number u).

The information processing method according to claim 7 is an information processing method of an information processing apparatus for transmitting or receiving data wirelessly, wherein the operation mode is a transmission mode for transmitting an encryption key used for encryption or decryption of the data. A setting step for setting (for example, step S11 in FIG. 8);
A transmission step (for example, step S15 in FIG. 8) for transmitting encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step.

  The information processing device according to claim 10 (for example, the display device 13 of FIG. 1) is an information processing device that wirelessly transmits or receives data, and an operation mode is an encryption key used for encryption or decryption of the data. A setting unit (for example, the CPU 102104 in FIG. 6) that sets a transmission mode for performing transmission, and a receiving unit (for example, FIG. 6) that receives encryption key information related to the encryption key when the transmission mode is set by the setting unit. 6 wireless transmission / reception modules).

  The information processing apparatus according to claim 13, wherein the encryption key information includes a first value that is a prime number (for example, a prime number p) and a second value that is a prime number that includes the encryption key (for example, a prime number q). And a value obtained by multiplying (for example, a multiplication value s).

  The information processing apparatus according to claim 14, wherein the encryption key information includes a multiplication value of a first value (for example, a prime number t) that is a prime number and the encryption key (for example, a WEP key v) as a prime number. It is a remainder obtained by dividing by a certain second value (for example, a prime number u).

  The information processing device according to claim 15, a storage unit that stores the encryption key obtained based on the encryption key information received by the receiving unit in association with the device that has transmitted the encryption key information. For example, the memory 103) of FIG. 6 is further provided.

The information processing method according to claim 17 is an information processing method of an information processing apparatus for transmitting or receiving data wirelessly, wherein the operation mode is a transmission mode for transmitting an encryption key used for encryption or decryption of the data. A setting step to set (for example, step S31 in FIG. 9);
A reception step (for example, step S39 in FIG. 9) for receiving encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step.

  The specific example of each step of the program according to claim 8 and the program of the recording medium according to claim 9 is also the same as the specific example in the embodiment of the invention of each step of the information processing method according to claim 7. Yes, a specific example of each step of the program according to claim 18 and the program of the recording medium according to claim 19 is also a specific example in the embodiment of the invention of each step of the information processing method according to claim 17. It is the same.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration example of an embodiment of an AV wireless transmission / reception system 1 to which the present invention is applied.

  The AV wireless transmission / reception system 1 shown in FIG. 1 includes an antenna coaxial cable 11, a receiving device 12, a display device 13, and a remote controller 14. Here, the receiving device 12 and the display device 13 constitute a television receiver as a whole. In the receiving device 12, the receiving device 12 constitutes a tuner portion of the television receiver, and the display device 13 constitutes a monitor portion of the television receiver.

  The receiving device 12 includes a tuner 21, a transmission unit 22, and a display unit 23.

  An analog broadcast signal received by an antenna (not shown) is input to the receiving device 12 via the antenna coaxial cable 11 and supplied to the tuner 21.

  Based on the information (channel information) of the channel desired by the user supplied from the transmission unit 22, the tuner 21 receives the AV signal of the desired channel from the broadcast signal input via the antenna coaxial cable 11. (AV data) is selected (detected, demodulated) and supplied to the transmitter 22.

  The transmission unit 22 communicates with the reception unit 31 of the display device 13 wirelessly according to the IEEE 802.11 standard. That is, the transmission unit 22 encrypts the AV signal from the tuner 21 using the WEP key, and transmits the encrypted data obtained as a result to the reception unit 31. The transmitter 22 receives channel information from the receiver 31 and supplies the channel information to the tuner 21. Furthermore, the transmission part 22 displays a message on the display part 23 as needed.

  The display unit 23 is composed of, for example, a liquid crystal panel and displays information supplied from the transmission unit 22.

  The display device 13 includes a receiving unit 31, a light receiving unit 32, and a display unit 33.

  The reception unit 31 receives the encrypted data transmitted from the transmission unit 22 of the reception device 12 and converts the encrypted data into an AV signal using the same WEP key used in the transmission unit 22. Decrypt. Further, the receiving unit 31 supplies the decoded AV signal to the display unit 33 for display. In addition, the receiving unit 31 sends channel information indicating a user's desired channel to the transmitting unit 22 of the receiving device 12 based on a control signal corresponding to the operation of the user's remote controller 14 supplied from the light receiving unit 32. Transmit according to the IEEE802.11 standard.

  The light receiving unit 32 receives infrared light or the like as a control signal corresponding to a user operation from the remote controller 14 and supplies the control signal to the receiving unit 31.

  The display unit 33 corresponds to a CRT (Cathode Ray Tube) or a liquid crystal panel of a television receiver, and displays an image of the AV signal from the reception unit 31. Note that the audio in the AV signal is output from a speaker (not shown).

  The remote controller 14 is operated by the user and transmits a control signal corresponding to the user's operation to the light receiving unit 32 of the display device 13 by infrared rays or the like. For example, when the user operates the remote controller 14 to indicate a desired channel, the remote controller 14 transmits a control signal representing the user's desired channel to the light receiving unit 32.

  In the AV wireless transmission / reception system 1 configured as described above, the tuner 21 of the reception device 12 supplies the AV signal of the channel corresponding to the operation of the remote controller 14 to the transmission unit 22, and the transmission unit 22 Is encrypted into encrypted data with a WEP key, and transmitted by wireless communication compliant with the IEEE 802.11 standard.

  On the other hand, the reception unit 31 of the display device 13 receives the encrypted data transmitted from the transmission unit 22 and decrypts it into an AV signal using the WEP key. The receiving unit 31 supplies the decoded AV signal to the display unit 33 for display.

  FIG. 2 shows a configuration example of the receiving unit 22 of the receiving device 12 and the transmitting unit 31 of the display device 13 in the case where the WEP key is set in advance at the time of factory shipment.

  The transmission unit 22 includes an MPEG (Moving Picture Experts Group) encoder 51, a CPU (Central Processing Unit) 52, a wireless transmission / reception module 53, and a memory 54.

  An AV signal is supplied from the tuner 21 to the MPEG encoder 51, and the MPEG encoder 51 encodes the AV signal in the MPEG format, and supplies a digitized MPEG-TS (Transport Stream) packet obtained as a result to the CPU 52. .

  The CPU 52 processes the MPEG-TS packet (hereinafter referred to as TS packet as appropriate) supplied from the MPEG encoder 51 to obtain a MAC frame (Frame) compliant with the IEEE802.11 standard. Then, the CPU 52 supplies the MAC frame to the wireless transmission / reception module 53, reads the WEP key 61 stored in the memory 54, and supplies it to the wireless transmission / reception module 53. In addition, the CPU 52 supplies channel information representing a user's desired channel supplied from the wireless transmission / reception module 53 to the tuner 21.

  The wireless transmission / reception module 53 encrypts the MAC frame supplied from the CPU 52 into encrypted data using the WEP key 61 supplied from the CPU 52, and transmits the encrypted data to the reception unit 31 wirelessly based on the IEEE 802.11 standard. The wireless transmission / reception module 53 receives the encrypted channel information representing the desired channel of the user from the wireless transmission / reception module 71 of the transmission unit 31, and wirelessly receives the channel information using the WEP key. The data is decrypted and supplied to the CPU 52.

  The memory 54 is composed of, for example, a nonvolatile memory, and stores, for example, a WEP key 61 that is set when the receiving device 12 is shipped from a manufacturing factory.

  On the other hand, the reception unit 31 includes a wireless transmission / reception module 71, a CPU 72, a decoder 73, and a memory 74.

  The wireless transmission / reception module 71 receives encrypted data transmitted wirelessly in accordance with the IEEE 802.11 standard from the wireless transmission / reception module 53 of the transmission unit 22, and uses the WEP key supplied from the CPU 72 for the encrypted data. The MAC frame is decoded and supplied to the CPU 72. Further, the wireless transmission / reception module 71 encrypts channel information supplied from the CPU 72 using the WEP key 74 and transmits the encrypted channel information to the transmission unit 22 wirelessly in accordance with the IEEE 802.11 standard.

  The CPU 72 reads the WEP key 81 from the memory 74 and supplies it to the wireless transmission / reception module 71, and also supplies the channel information supplied from the light receiving unit 32 to the wireless transmission / reception module 71. Further, the CPU 72 extracts a TS packet from the MAC frame supplied from the wireless transmission / reception module 71 and supplies it to the MPEG decoder 73.

  The MPEG decoder 73 decodes the TS packet supplied from the CPU 72 by the MEPG method, and supplies the AV signal obtained as a result to the display unit 33 to display an image.

  The memory 74 is composed of, for example, a non-volatile memory, and stores, for example, a WEP key 81 set when the display device 13 is shipped from a manufacturing factory.

  The WEP key 81 has the same value as the WEP key 61 stored in the memory 54 of the transmission unit 22. That is, the same value is set as the WEP key 61 and the WEP key 81 at the time of factory shipment.

  In the transmission unit 22 and the reception unit 31 configured as described above, first, the AV signal is converted into a TS packet in the MPEG 51 of the transmission unit 22 and supplied to the CPU 52. The CPU 52 converts the TS packet from the MPEG 51 into a MAC frame and supplies it to the wireless transmission / reception module 53 together with the WEP key 61 stored in the memory 54. The wireless transmission / reception module 53 encrypts the MAC frame from the CPU 52 into encrypted data with the WEP key from the CPU 52 and transmits the encrypted data wirelessly.

  On the other hand, in the reception unit 31, the wireless transmission / reception module 71 receives encrypted data transmitted from the wireless transmission / reception module 53, and decrypts it into a MAC frame with the WEP key 81 stored in the memory 74 supplied from the CPU 72. Then, it is supplied to the CPU 72. The CPU 72 obtains a TS packet from the MAC frame from the wireless transmission / reception module 71 and supplies it to the MPEG decoder 73. The MPEG decoder 73 decodes the TS packet from the CPU 72 and outputs an AV signal obtained as a result.

  FIG. 3 is a diagram for explaining processing in which the CPU 52 in FIG. 2 uses TS packets as MAC frames.

  The CPU 52 encapsulates the TS packet into, for example, a MAC layer (Layer), an IP (Internet Protocol) layer, a UDP (User Datagram Protocol) layer, and an RTP (Real-time Transport Protocol) layer.

  That is, the CPU 52 collects an appropriate number of TS packets and generates an RTP packet. The data part of the RTP packet is TS packet data (Packet Data), and the header part of the RTP packet is an RTP header (Header). The CPU 52 adds a UDP header (Header) to the RTP packet, and generates a UDP packet for real-time transmission. Then, the CPU 52 adds an IP header (Header) including the IP address of the transmission source, the IP address of the transmission destination, and the like to the UDP packet to generate an IP packet, and the MAC header (Header) is added to the IP packet. To generate a MAC frame. That is, an IP packet is arranged in the frame body of the MAC frame.

  In FIG. 3, a UDP header is added to the RTP packet to generate a real-time transmission UDP packet, but a TCP (Transmission Control Protocol) header is added instead of the UDP header to generate a TCP packet. You can also

  FIG. 4 shows the format of the MAC frame.

  The MAC frame starts from the beginning with 2 octets of frame control (Frame Control), 2 octets of time / ID, 6 octets of addresses 1 to 4 and 2 octets of sequence control (Sequence Control), 0 A frame body 125 from octets to 2312 octets and a 4-octet FCS (Frame Check Sequence) are sequentially arranged.

  Of these, the head frame control is configured as shown in FIG. The time / ID describes a waiting time until the transmission unit 22 can transmit data, and the address 1 describes the destination MAC address. In addition, the MAC address of the transmission source is described in address 2, and the BSSID (Basic Service Set Identifier) is described in address 3. Further, information for sequence control is described in the sequence control, and nothing is described in the address 4 in the case of wireless communication. The IP packet described in FIG. 3 is arranged in the frame body, and data for checking the MAC frame is described in the FCS.

  FIG. 5 shows the format of the frame control of FIG.

  The frame control starts from the beginning with a 2-bit protocol version, 2-bit type, 4-bit subtype, 1-bit To DS, 1-bit From DS, 1-bit More flag (More Flag), 1-bit retry (Retry), 1-bit Pwr Mgt, 1-bit More Data, 1-bit WEP, and 1-bit order (Order) are sequentially arranged.

  Protocol version information describes protocol version information, and types and subtypes describe types of frames such as management frames, control frames, and data frames. To DS describes the communication type of the destination (transmission destination), and From DS describes the communication type of the transmission source. More Frag, Retry, Pwr Mgt More Data, and Order describe information such as frame retransmission and division. WEP describes data indicating whether or not the data of the frame body is encrypted using the WEP key. That is, when the frame body data is encrypted using the WEP key, the WEP bit is set to 1. On the other hand, when the data of the frame body is not encrypted using the WEP key, the WEP bit is set to 0.

  2, the WEP key 61 and the WEP key 81 used for encryption or decryption in the wireless transmission / reception module 53 and the wireless transmission / reception module 71 are stored in the memory 54 and the memory 74, respectively, at the time of manufacture. Stored (set).

  That is, in the transmission unit 22 of the reception device 12 and the reception unit 31 of the display device 13 in FIG. 2, AV data transmitted from the transmission unit 22 to the reception unit 31 is stored in a personal computer or the like and reused. In order to prevent eavesdropping by the wireless transmission / reception system, the WEP key used for encryption or decryption is not disclosed to the third party as well as the users of the reception device 12 and the display device 13, and the reception device 12 and the display device 13 is set. Therefore, even if the user purchases another display device, for example, the same WEP key as the WEP key 61 of the receiving device 12 is not always set in the display device. May not be able to view the AV signal transmitted from the receiving device 12 on a newly purchased display device.

  6 shows another configuration example of the transmission unit 22 and the reception unit 31 of the AV wireless transmission / reception system 1 of FIG. In the transmission unit 22 and the reception unit 31 in FIG. 6, the WEP key is transmitted from one to the other without being disclosed to the outside so that encryption and decryption using the same WEP key can be performed. It has become.

  The transmission unit 22 includes an MPEG encoder 51, a CPU 91, a wireless transmission / reception module 92, a memory 93, and a switch 94. The receiving unit 31 includes an MPEG decoder 73, a wireless transmission / reception module 101, a CPU 102, a memory 103, and a switch 104.

  2 are the same as those in FIG. 2, and the description thereof will be omitted.

The CPU 91 of the transmission unit 22 converts the TS packet supplied from the MPEG encoder 51 into a MAC frame and supplies it to the wireless transmission / reception module 92. Further, the CPU 91 reads two prime numbers p and prime number q, which will be described later, stored in the memory 93, multiplies the prime number p and the prime number q, and uses the multiplied value s as key information (encryption key) about the WEP key. Information) to the wireless transmission / reception module 92. Further, the CPU 91 reads only the prime number q from the memory 93 and supplies the upper predetermined number of bits as a WEP key to the wireless transmission / reception module 92. Further, the voltage V _H or V _L is supplied to the CPU 91 according to the operation of the switch 94. The CPU 91 sets the operation mode of the receiving device 12 according to the voltage from the switch 94 and supplies a mode signal representing the operation mode to the wireless transmission / reception module 92. Further, the CPU 91 supplies channel information representing a user's desired channel supplied from the wireless transmission / reception module 92 to the tuner 21. Further, the CPU 91 displays a predetermined message on the display unit 23 in accordance with a signal supplied from the wireless transmission / reception module 92. The CPU 91 controls data transmission and reception by the wireless transmission / reception module 92.

  Based on the mode signal supplied from the CPU 91, the wireless transmission / reception module 92 transmits the multiplication value s as key information supplied from the CPU 91 to the receiving unit 101 wirelessly without encryption. Alternatively, the MAC frame supplied from the CPU 91 is encrypted into encrypted data using the WEP key supplied from the CPU 91 and transmitted to the receiving unit 101 wirelessly in accordance with the IEEE 802.11 standard. The wireless transmission / reception module 92 receives channel information representing a desired channel of the encrypted user transmitted from the wireless transmission / reception module 101 of the transmission unit 31 wirelessly in accordance with the IEEE 802.11 standard, and the channel information. Is decrypted using the WEP key supplied from the CPU 91 and supplied to the CPU 91.

  The memory 93 is composed of, for example, a non-volatile memory, and stores a prime number p having a predetermined number of bits such as 160 bits set when the receiving device 12 is shipped from the manufacturing factory. Further, the memory 93 stores a prime number q of 1 or more of a predetermined number of bits, such as 160 bits in which the upper 104 bits serve as a WEP key.

The switch 94 is operated by the user when setting the operation mode of the receiving device 12. That is, the switch 94 can be operated upward and downward in the drawing. When the switch 94 is operated upward, the switch 94 supplies (applies) the voltage V _H to the CPU 91. Further, when the switch 94 is operated to the lower side, the switch 94 supplies the voltage V _L to the CPU 91. Here, when the voltage V _H is supplied from the switch 94, the CPU 91 sets the operation mode of the receiving device 12 to the transmission mode for transmitting the WEP key. Further, when the voltage V _L is supplied from the switch 94, the CPU 91 sets the operation mode of the receiving device 12 to a normal mode in which encryption or decryption using the WEP key is performed. Therefore, when the switch 94 is operated to the upper side, the operation mode of the receiving device 12 is the transmission mode. On the other hand, when the switch 94 is operated downward, the operation mode of the receiving device 12 is the normal mode.

  The wireless transmission / reception module 101 of the reception unit 31 receives the encrypted data transmitted from the wireless transmission / reception module 92 of the transmission unit 22 or the multiplication value s as unencrypted key information wirelessly according to the IEEE802.11 standard. To do. Then, the wireless transmission / reception module 101 determines whether the received data is encrypted data or non-encrypted data, that is, a multiplication value s as key information. Here, it is recognized (determined), for example, by referring to the WEP bit described with reference to FIG. 5 whether the received data received by the wireless transceiver module 101 is encrypted data or non-encrypted data. Can do. When determining that the unencrypted multiplication value s has been received, the wireless transmission / reception module 101 supplies the unencrypted multiplication value s to the CPU 102. If the wireless transmission / reception module 101 determines that the encrypted data has been received, the wireless transmission / reception module 101 decrypts the encrypted data using the WEP key supplied from the CPU 102 and supplies the decrypted data to the CPU 102. In addition, the wireless transmission / reception module 101 encrypts channel information supplied from the CPU 102 using the WEP key, and transmits the encrypted information to the transmission unit 22 wirelessly in accordance with the IEEE 802.11 standard.

The CPU 102 reads the prime number p stored in the memory 103, obtains a prime number q using the prime number p and the multiplication value s supplied from the wireless transmission / reception module 101, and further obtains a WEP key from the prime number q. In addition, the CPU 102 supplies the WEP key to the memory 103 for storage, reads the WEP key stored in the memory 103, and supplies it to the wireless transmission / reception module 101. Further, the CPU 102 extracts a TS packet from the decoded MAC frame supplied from the wireless transmission / reception module 101 and supplies it to the MPEG decoder 73. Further, channel information is supplied to the CPU 102 from the light receiving unit 32, and the CPU 102 supplies the channel information to the wireless transmission / reception module 101. Further, the voltage V _H or V _L is supplied to the CPU 102 according to the operation of the switch 104. The CPU 102 sets the operation mode of the display device 13 according to the voltage from the switch 104 and supplies a mode signal representing the operation mode to the wireless transmission / reception module 101. In addition, the CPU 91 displays a predetermined message on the display unit 33 in accordance with a signal supplied from the wireless transmission / reception module 101. The CPU 102 controls data transmission and reception by the wireless transmission / reception module 101.

  The memory 103 is composed of, for example, a non-volatile memory, and stores a prime number p having a predetermined number of bits such as 160 bits set when the display device 13 is shipped from the manufacturing factory. The memory 103 stores a WEP key supplied from the CPU 102. Note that the prime p stored in the memory 103 is the same value as the prime p stored in the memory 93 of the transmission unit 22.

The switch 104 is operated by the user when setting the operation mode of the display device 13. That is, the switch 104 can be operated upward and downward in the drawing. When the switch 104 is operated upward, the switch 104 supplies (applies) the voltage V _H to the CPU 102. Further, when the switch 104 is operated downward, the switch 104 supplies the voltage V _L to the CPU 102. Here, when the voltage V _H is supplied from the switch 104, the CPU 102 sets the operation mode of the display device 13 to a transmission mode for transmitting the WEP key. Further, when the voltage V _L is supplied from the switch 104, the CPU 102 sets the operation mode of the display device 13 to a normal mode in which encryption or decryption using a WEP key is performed. Therefore, when the switch 104 is operated upward, the operation mode of the display device 13 is the transmission mode. On the other hand, when the switch 104 is operated downward, the operation mode of the display device 13 is the normal mode.

  In the transmission unit 22 and the reception unit 31 configured as described above, when the operation mode is the normal mode, that is, when the switch 94 and the switch 104 are operated downward, the CPU 91 of the transmission unit 22 The TS packet supplied from the MPEG encoder 51 is converted into a MAC frame and supplied to the wireless module 92, and the upper 104 bits of the prime number q stored in the memory 93 is supplied to the wireless transmission / reception module 92 as a WEP key. The wireless module 92 encrypts the MAC frame from the CPU 91 into encrypted data using the WEP key from the CPU 91 and transmits the encrypted data.

  In the reception unit 31, the wireless transmission / reception module 101 receives the encrypted data transmitted from the wireless transmission / reception module 92 and decrypts it using the WEP key supplied from the CPU 102. The CPU 101 supplies the MAC frame obtained by the decoding to the CPU 102. The CPU 102 extracts a TS packet from the MAC frame from the wireless transmission / reception module 101 and supplies it to the MPEG decoder 73.

  On the other hand, when the operation mode is the transmission mode, that is, when the switch 94 and the switch 104 are operated upward, the CPU 91 reads the prime number p and the prime number q from the memory 93 and uses the multiplication value s as key information. Calculate. Further, the CPU 91 configures, for example, an IP packet (TCP / IP packet) in which a multiplication value s as key information is arranged, adds a MAC header to the IP packet, configures a MAC frame, This is supplied to the wireless transmission / reception module 92. The wireless transmission / reception module 92 transmits the MAC frame from the CPU 91 wirelessly in accordance with the IEEE 802.11 standard without encryption.

  In the reception unit 31, the wireless module 101 receives the MAC frame transmitted from the wireless transmission / reception module 92 of the transmission unit 22 and supplies the MAC frame to the CPU 102. The CPU 102 extracts an IP packet from the MAC frame from the wireless transmission / reception module 101, and further extracts a multiplication value s as key information arranged in the IP packet. Then, the CPU 102 reads the prime number p from the memory 103 and divides the multiplication value s by the prime number p to obtain the prime number q. Further, the CPU 102 extracts the upper 104 bits of the prime number q, supplies it to the memory 103 as a WEP key, and stores it.

  As described above, the transmission unit 22 in FIG. 6 transmits the multiplication value s of the 160-bit prime number p and the 160-bit prime number q whose upper 104 bits are composed of the WEP key, and the reception unit 31 A WEP key is obtained from the multiplication value s and a 160-bit prime number p. That is, the receiving unit 31 calculates the prime number q by dividing the multiplication value s by the prime number p, and sets the higher 104 bits in the WEP key.

  Therefore, the receiving unit 31 can obtain the same WEP key as that used in the transmitting unit 22, and encryption and decryption are performed between the transmitting unit 22 and the receiving unit 31 using the WEP key. Can do. As a result, for example, even when the display device 13 is changed to another display device, the other display device obtains the same WEP key as that used in the reception device 12 and In between, encryption and decryption can be performed using the WEP key. Therefore, the user can easily change a device that performs wireless communication, such as replacement or addition of the display device 13.

  Further, it is very difficult to obtain a factor of the original two prime numbers p and prime q by multiplying the product s of two large prime numbers p and prime q of 160 bits or more into prime factors. By employing the product s of p and prime q, the WEP key is transmitted from the transmission unit 22 of the reception device 12 to the reception unit 31 of the display device 13 without the user or third party knowing the value of the WEP key. be able to.

  FIG. 7 shows an outline of the format of a MAC frame generated when the CPU 91 of the transmission unit 22 in FIG. 6 transmits key information.

  The CPU 91 arranges key information in the TCP / IP payload portion, adds a TCP header (Header), and generates a TCP packet. Further, the CPU 91 generates an IP packet by adding an IP header including the source IP address, the destination IP address, and the like to the TCP packet. Further, the CPU 91 adds a MAC header to the IP packet to generate a MAC frame.

  Next, processing performed when the transmission unit 22 in FIG. 6 transmits key information will be described with reference to the flowchart in FIG. This process is started, for example, when the switch 94 is operated upward.

  In step S11, the CPU 91 sets the operation mode of the receiving device 12 to the transmission mode of the transmission mode or the normal mode, and proceeds to step S12. Specifically, the CPU 91 loads a program for performing the processing of steps S12 to S18 described below, and starts its execution.

  In step S <b> 12, the CPU 91 determines whether or not the wireless transmission / reception module 92 has received a WEP key transmission request for requesting transmission of a WEP key from the wireless transmission / reception module 101 of the reception unit 31.

  That is, as will be described later, when the receiving unit 31 of the display device 13 is in the transmission mode, the WEP key transmission request is placed in, for example, the TCP / IP payload portion in the MAC frame having the format shown in FIG. In step S12, the CPU 91 determines whether the wireless transmission / reception module 92 has received the WEP key transmission request transmitted as described above.

  If it is determined in step S12 that the WEP key transmission request has not been received, the CPU 91 waits until the wireless transmission / reception module 92 receives the WEP key transmission request.

  On the other hand, if it is determined in step S12 that the wireless transmission / reception module 92 has received a WEP key transmission request, the process proceeds to step S13, and the CPU 91 obtains a 160-bit prime number p from the memory 93 and the upper 104 bits from the WEP key. The constructed prime number q is read out, and the process proceeds to step S14.

  In step S14, the CPU 91 multiplies the prime number p and the prime number q read in step S13, and uses the multiplication value s as key information related to the WEP key, and the key information is arranged in the TCP / IP payload portion as shown in FIG. A MAC frame of a different format. Then, the process proceeds from step S14 to step S15.

  In step S15, the CPU 91 supplies the MAC frame (FIG. 7) in which the multiplication value s configured in step S14 is arranged in the TCP / IP payload section to the wireless transmission / reception module 92 for transmission, and proceeds to step S16.

  In step S <b> 16, the CPU 91 determines whether or not the wireless transmission / reception module 92 has received the MAC frame of FIG. 7 described in the TCP / IP payload portion indicating that the reception unit 31 has received the key information normally. To do.

  If it is determined in step S16 that the acknowledge ACK has not received the MAC frame described in the TCP / IP payload part, the process returns to step S12, and the WEP key transmission request is received again from the wireless transceiver module 101 of the receiver 31. Wait until it is received, and repeat the above-described processing.

  Note that one prime number is stored in the memory 93 as the prime number q, and the one prime number q can be read from the memory 93 each time the process of step S13 is performed. Further, a plurality of prime numbers are stored in the memory 93 as the prime number q, and one prime number is selected at random from the plurality of prime numbers stored in the memory 93 each time the process of step S13 is performed. It is also possible to read as a prime number q. Further, a prime number may be randomly generated and stored in the memory 93 immediately before the processing in step S13 is performed, and in step S13, the prime number stored immediately before that may be read from the memory 93 as the prime number q. it can. When a plurality of prime numbers are stored in the memory 93 and when a prime number is randomly generated and stored in the memory 93, in step S13, the prime number q obtained in the previous step S13 and A prime number q having a different value is basically obtained.

  If it is determined in step S16 that ACK has not been received, the process can return to step S13 instead of step S12. In this case, the transmission unit 22 retransmits the key information without waiting for a WEP key transmission request from the reception unit 31.

  On the other hand, if it is determined in step S16 that the acknowledge ACK has received the MAC frame described in the TCP / IP payload part, the process proceeds to step S17, and the CPU 91 displays a message indicating the completion of transmission of the WEP key on the display part 23. Then, the process proceeds to step S18.

  In step S18, the CPU 91 configures a MAC frame in which a message indicating completion of transmission of the WEP key is arranged in the TCP / IP payload portion, supplies the MAC frame to the wireless transmission / reception module 92, and ends the processing.

  Thereafter, when the switch 94 is operated downward, the CPU 91 sets the operation mode to the normal mode. In the normal mode, the CPU 91 supplies the upper 104 bits of the prime number q read from the memory 93 in step S13 performed immediately before to the wireless transmission / reception module 92 as a WEP key. Then, the wireless transmission / reception module 92 encrypts and decrypts data using the WEP key.

  Next, processing performed when the receiving unit 31 in FIG. 6 receives key information will be described with reference to the flowchart in FIG. 9. This process is started, for example, when the switch 104 is operated upward.

  In step S31, the CPU 102 sets the operation mode of the display device 13 to the transmission mode of the transmission mode or the normal mode, and proceeds to step S32. Specifically, the CPU 102 loads a program for performing the processing of steps S32 to S40 described below, and starts its execution.

  In step S32, the CPU 102 configures the MAC frame of FIG. 9 in which the WEP key transmission request is arranged, controls the wireless transmission / reception module 101 to transmit the MAC frame, and proceeds to step S33.

  In step S33, the CPU 102 arranges the multiplication value s as key information, which is transmitted from the wireless transmission / reception module 92 of the transmission unit 22 in response to the WEP key transmission request, in the TCP / IP payload section. It is determined whether the received MAC frame (FIG. 7) has been received.

  If it is determined in step S33 that the wireless transmission / reception module 101 has not received a MAC frame in which the multiplication value s is placed in the TCP / IP payload portion, the wireless transmission / reception module 101 waits until the MAC frame is received.

  On the other hand, if it is determined in step S33 that the wireless transmission / reception module 101 has received a MAC frame in which the multiplication value s is arranged in the TCP / IP payload portion, the process proceeds to step S34, and the CPU 102 determines the multiplication value s as key information. It is determined whether or not the MAC frame arranged in the TCP / IP payload part is normally received.

  If it is determined in step S34 that the MAC frame in which the multiplication value s is arranged in the TCP / IP payload portion is not normally received, the process returns to step S32, and the CPU 102 requests the WEP key transmission request to transmit the WEP key again. Is transmitted to the wireless transmission / reception module 101, and the above-described processing is repeated.

  If it is determined in step S34 that the multiplication value s has not been normally received, the process returns to step S33, not step S32, and waits for the retransmission of the multiplication value s from the transmission unit 22. be able to.

  On the other hand, if it is determined in step S34 that the MAC frame in which the multiplication value s is arranged in the TCP / IP payload part is normally received, the process proceeds to step S35, and the CPU 102 describes the acknowledge ACK in the TCP / IP payload part. The MAC frame of FIG. 7 is configured and transmitted to the wireless transmission / reception module 101, and the process proceeds to step S36.

  In step S36, the CPU 102 reads a 160-bit prime p from the memory 103, and proceeds to step S37.

  In step S37, the CPU 102 divides the multiplication value s received by the wireless transmission / reception module 101 by the prime number p read in step S36, obtains a prime number q as a result of the division, and proceeds to step S38.

  In step S38, the CPU 102 stores the upper 104 bits of the prime q obtained in step S37 in the memory 103 as a WEP key, and proceeds to step S39.

  In step S39, the CPU 102 determines whether or not the wireless transmission / reception module 101 has received a MAC frame in which a message indicating completion of transmission of the WEP key is received.

  If it is determined in step S39 that the MAC frame in which the message indicating the completion of the transmission of the WEP key is not received, the process waits until the MAC frame in which the message indicating the completion of the transmission of the WEP key is received.

  On the other hand, if it is determined in step S39 that a MAC frame in which a message indicating completion of transmission of the WEP key is received has been received, the process proceeds to step S40, and the CPU 102 displays a message indicating completion of transmission of the WEP key on the display unit 33. Display and finish the process.

  Thereafter, when the switch 104 is operated downward, the CPU 102 sets the operation mode to the normal mode. In the normal mode, the CPU 102 reads out the WEP key stored in step S38 and supplies it to the wireless transmission / reception module 101.

  Next, the key information transmission / reception process between the transmission unit 22 of the reception device 12 of FIG. 6 and the reception unit 31 of the display device 13 performed in the transmission mode will be further described with reference to FIG.

  In transmitting / receiving the key information between the transmission unit 22 and the reception unit 31, the MAC frame in FIG. 7 is used as described with reference to FIGS. The MAC frame in FIG. 7 includes an IP header, that is, includes an IP packet. Therefore, an IP address is set in the transmission unit 22 and the reception unit 31 for the exchange of the IP packet. It is necessary to keep it.

  As an IP address setting method for the transmission unit 22 and the reception unit 31, for example, there is a method in which a user sets an IP address. Further, when a DHCP (Dynamic Host Configuration Protocol) server exists in the network to which the transmission unit 22 and the reception unit 31 belong, even if an IP address is set in the transmission unit 22 and the reception unit 31 by the DHCP server. Good.

  Furthermore, for example, there is a method of setting IP addresses to the transmission unit 22 and the reception unit 31 by APIPA (Automatic Private IP Addressing). Here, for example, it is assumed that IP addresses are set in the transmission unit 22 and the reception unit 31 by APIPA.

  In step S71, as described in step S32 in FIG. 9, the receiving unit 31 wirelessly transmits the MAC frame (FIG. 7) in which the WEP key transmission request is described in the TCP / IP payload portion to the transmitting unit 22.

  Here, according to APIPA, for example, in IPv4 (Internet Protocol version 4), any IP address in the range of 169.254.0.0 to 169.254.255.255 is assigned. The subnet mask is 255.255.0.0.

  When an IP address is assigned to the transmission unit 22 and the reception unit 31 by APIPA, the transmission unit 22 and the reception unit 31 cannot recognize what value is assigned as the IP address of the other party.

  Therefore, in step S71, the receiving unit 31 wirelessly transmits each IP packet addressed to all IP addresses that can be set by APIPA (excluding the IP address of the own device (receiving unit 31)). .

  In step S51, as described in step S12 of FIG. 8, the transmission unit 22 is addressed to itself among the IP packets transmitted by the reception unit 31 in step S71, that is, addressed to the IP address assigned to the transmission unit 22. IP packets are received wirelessly. In step S52, as described in step S15 of FIG. 8, the transmission unit 22 responds to the WEP key transmission request arranged in the IP packet with the prime number p and the prime number q stored in the memory 93. An IP packet (which is a MAC frame) in which the key information, which is the multiplication value s of, is described in the TCP / IP payload portion, is transmitted to the receiving portion 31 wirelessly. At this time, the transmission unit 22 recognizes the IP address of the reception unit 31 that is the destination of the reception unit 31 from the IP packet received in step S51. That is, the IP packet transmitted by the receiving unit 31 includes the IP address of the receiving unit 31, and the transmitting unit 22 receives the IP address of the receiving unit 31 from the IP packet received from the receiving unit 31 in step S51. In step S52, an IP packet in which key information is arranged is wirelessly transmitted to the recognized IP address.

  In step S72, the receiving unit 31 wirelessly transmits an IP packet addressed to the receiving unit 31 in which the key information transmitted from the transmitting unit 22 is described in the TCP / IP payload portion, as described in step S33 of FIG. Receive. After that, the receiving unit 31 divides the multiplication value s as key information by the prime number p stored in the memory 103 to obtain the prime number q, and sets the higher 104 bits in the WEP key. The memory 103 of the receiving unit 31 stores the WEP key. Thereafter, in step S73, as described in step S35 of FIG. 9, the receiving unit 31 sends an IP packet in which an acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion to the transmitting unit 22. To wirelessly. At this time, the reception unit 31 recognizes the IP address of the transmission unit 22, which is the destination of the transmission unit 22, from the IP packet received in step S72. That is, the IP packet transmitted by the transmission unit 22 includes the IP address of the transmission unit 22, and the reception unit 31 uses the IP packet from the transmission unit 22 received in step S72 to determine the IP address of the transmission unit 22. In step S73, an IP packet in which an acknowledge ACK is arranged is transmitted wirelessly to the recognized IP address.

  In step S53, the transmission unit 22 wirelessly receives an IP packet in which the acknowledge ACK transmitted from the reception unit 31 is described in the TCP / IP payload portion, as described in steps S16 and S17 of FIG. A message indicating completion of transmission of the WEP key is displayed on the display unit 23. In step S54, the transmission unit 22 wirelessly transmits an IP packet of a message indicating completion of WEP key transmission to the reception unit 31, as described in step S18 of FIG.

  In step S74, the reception unit 31 wirelessly receives the IP packet transmitted by the transmission unit 22 in step S54 as in steps S39 and S40 of FIG. 9, and transmits the WEP key arranged in the IP packet. A message indicating completion is displayed on the display unit 33.

  Thereafter, when the user looks at the message displayed on the display unit 23 and the display unit 33 and operates the switch 94 and the switch 104 downward, the transmission unit 22 and the reception unit 31 change their operation modes to the transmission mode. To normal mode. Then, the transmission unit 22 and the reception unit 31 encrypt the data to be transmitted from one to the other using the same WEP key (the upper 104 bits of the prime number q), and decrypt the received data using the WEP key. To do.

  For example, when the receiving unit 31 receives user-desired channel information from the remote controller 14 via the light receiving unit 32 by the operation of the user's remote controller 14, the receiving unit 31 encrypts the channel information using the WEP key. Then, the data is transmitted to the transmission unit 22 wirelessly according to the IEEE802.11 standard. Then, the transmission unit 22 receives the channel information wirelessly according to the IEEE 802.11 standard, decodes it using the WEP key, and supplies the decoded channel information to the tuner 21, so that the tuner 21 can display the display device. 13 can be switched to the AV signal of the channel desired by the user.

  Further, when the transmission unit 22 supplies the AV signal of the user's desired channel to the reception unit 31, the transmission unit 22 uses the TS packet encoded with the AV signal of the user's desired channel supplied from the tuner 21 as a MAC frame. The data is encrypted using a WEP key and transmitted to the receiving unit 31 wirelessly in accordance with the IEEE 802.11 standard. Then, the receiving unit 31 receives the MAC frame wirelessly in accordance with the IEEE 802.11 standard, decodes it using the WEP key, extracts a TS packet from the decoded MAC frame, and decodes the TS packet. Are displayed on the display unit 33.

  As described above, since the transmission unit 22 transmits the multiplication value s as key information to the reception unit 31, the key information is transmitted from the wireless device by the user operating the barcode reader as in Patent Document 1. The load on the user can be reduced compared to the case of reading the serial number or the like and transmitting it to a personal computer. Further, since the transmission unit 22 transmits the multiplication value s of the prime number p and the prime number q including the WEP key to the reception unit 31, the personal computer uses the generated WEP key itself as a wireless device as in Patent Document 1. As compared with the case of transmitting to the mobile phone, it is possible to prevent leakage at the time of transmitting the WEP key.

  Further, the transmission unit 22 transmits the multiplication value s, which is key information, to the reception unit 31 when the operation mode of the reception device 12 is set to the transmission mode by operating the switch 94. The reception unit 31 When the operation mode of the display device 13 is set to the transmission mode by operating the switch 104, the multiplication value s is received from the transmission unit 22. Therefore, as in Patent Document 2, when the printer is turned on, That is, in the standby state, it is possible to prevent leakage of key information to a device existing in a neighbor or the like as compared with a method of receiving a unique ID that is key information from a personal computer. That is, in Patent Document 2, when the power of a device existing in a neighbor is turned on, key information is also received by that device, but in FIG. 6, only when the operation mode is the transmission mode. Since the receiving unit 31 receives the multiplication value s that is key information, if the operation mode is not the transmission mode in the device existing in the neighbor, the key information is received even when the power is turned on. In this way, it is possible to prevent leakage of key information to a device existing in a neighboring house or the like.

  8 to 10, the WEP key transmission completion message is displayed on the display unit 23 and the display unit 33 to notify the user of the completion of the WEP key transmission. In addition, for example, the user may be notified by lighting of an LED (Light Emitting Diode) or the like.

  In the description of FIGS. 6 to 10, the case where the AV wireless transmission / reception system 1 is configured by one reception device 12 and one display device 13 has been described, but the reception device 12 and the display device 13 of the AV wireless transmission / reception system are There may be a plurality of each.

  FIG. 11 shows a configuration example of an AV wireless transmission / reception system including one receiving device 12, two display devices 121-1, and a display device 121-2.

  In addition, what attached | subjected the code | symbol same as FIG. 1, ie, the antenna coaxial cable 11, the display apparatus 12, the tuner 21, the transmission part 22, and the display part 23 of FIG. 11, are the same as those of FIG. The description will be omitted because it will be repeated.

  Further, the display device 121-1 and the display device 121-2 in FIG. 11 are configured in the same manner as the display device 13 in FIG. That is, the receiving unit 131-1, the light receiving unit 132-1 and the display unit 133-1 of the display device 121-1 in FIG. 11, the receiving unit 131-2, the light receiving unit 132-2, and the display unit of the display device 121-2. 133-2 correspond to the receiving unit 31 (FIG. 6), the light receiving unit 32, and the display unit 33 of the display device 13 of FIG. 1, respectively, and the display device 121-1 and the display device 121-2 of FIG. The same processing as each of the above is performed. Furthermore, the remote controller 122-1 and the remote controller 122-2 in FIG. 11 are configured in the same manner as the remote controller 14 in FIG. 1, and perform the same processing.

  Next, referring to FIG. 12, in the AV wireless transmission / reception system of FIG. 11, between the transmission unit 22 of the reception device 12 and the reception unit 131-1 of the display device 121-1, which are performed in the transmission mode, and the reception device. A transmission / reception process of key information between the 12 transmission units 22 and the reception unit 131-2 of the display device 121-2 will be described.

  In the transmission / reception of key information between the transmission unit 22 and the reception unit 131-1 and between the transmission unit 22 and the reception unit 131-2, as described with reference to FIGS. A frame is used. The MAC frame in FIG. 7 includes an IP header, that is, includes an IP packet. Therefore, for the exchange of the IP packet, the transmission unit 22, the reception unit 131-1, and the reception unit 131 are included. -2 needs to set an IP address.

  For example, as described above, the IP address setting for the transmission unit 22, the reception unit 131-1 and the reception unit 131-2 may be performed by the user or by a DHCP server or APIPA. However, for example, it is assumed that IP addresses are set in the transmission unit 22, the reception unit 131-1, and the reception unit 131-2 by APIPA.

  In step S131, the reception unit 131-2 wirelessly transmits the MAC frame (FIG. 7) in which the WEP key transmission request is described in the TCP / IP payload portion to the transmission unit 22, as described in step S71 of FIG. Send.

  That is, in step S131, the receiving unit 131-2 receives each IP packet addressed to all IP addresses that can be set by APIPA (except for the IP address of the own unit (receiving unit 131-2)). Send wirelessly.

  In step S91, as in the case described in step S51 of FIG. 10, the transmission unit 22 is addressed to itself among the IP packets transmitted by the reception unit 131-2 in step S131, that is, assigned to the transmission unit 22. An IP packet addressed to the IP address is received wirelessly.

  In step S111, the reception unit 131-1 wirelessly transmits a MAC frame in which the WEP key transmission request is described in the TCP / IP payload part to the transmission unit 22, as described in step S71 of FIG. At this time as well, as in step S91, the receiving unit 131-1 receives each IP packet addressed to all IP addresses that can be set by APIPA (except for the IP address of the own device (receiving unit 131-1)). The arranged MAC frame) is transmitted wirelessly.

  In step S92, the transmission unit 22 is assigned to itself, that is, to the transmission unit 22 among the IP packets transmitted by the reception unit 131-1 in step S111, as in the case described in step S51 of FIG. An IP packet addressed to the IP address is received wirelessly. Then, in step S93, the transmission unit 22 responds to the WEP key transmission request arranged in the IP packet received from the reception unit 131-2 in step S91, as in the case described in step S52 of FIG. 93, an IP packet in which key information that is a multiplication value s of the prime number p and the prime number q stored in 93 is described in the TCP / IP payload portion (which is a MAC frame) is wirelessly transmitted to the reception portion 131-2. Send with. At this time, the transmission unit 22 recognizes the IP address of the reception unit 131-2 that is the destination of the reception unit 131-2 from the IP packet received in step S91. That is, the IP packet transmitted by the receiving unit 131-2 includes the IP address of the receiving unit 131-2, and the transmitting unit 22 uses the IP packet from the receiving unit 131-2 received in step S91. The IP address of the receiving unit 131-2 is recognized, and in step S93, an IP packet in which key information is arranged is transmitted wirelessly to the recognized IP address.

  In step S132, the reception unit 131-2 is addressed to the reception unit 131-2 in which the key information transmitted from the transmission unit 22 is described in the TCP / IP payload portion, as in the case described in step S72 of FIG. The IP packet is received wirelessly. After that, the reception unit 131-2 divides the multiplication value s as key information by the prime number p stored in the memory 103 of the reception unit 131-2 to obtain the prime number q, and the higher 104 bits are obtained as the WEP key. Set to. Then, the memory 103 of the receiving unit 131-2 stores the WEP key.

  In step S94, the transmission unit 22 responds to the WEP key transmission request placed in the IP packet received from the reception unit 131-1 in step S92 in the memory 93 as in the case described in step S52 of FIG. An IP packet (which is a MAC frame) in which the key information, which is the multiplication value s of the stored prime number p and prime number q, is described in the TCP / IP payload portion is wirelessly transmitted to the receiving portion 131-1. To do. At this time, the transmission unit 22 recognizes the IP address of the reception unit 131-1 that is the destination of the reception unit 131-1 from the IP packet received in step S92. That is, the IP packet transmitted by the receiving unit 131-1 includes the IP address of the receiving unit 131-1, and the transmitting unit 22 uses the IP packet from the receiving unit 131-1 received in step S92. The IP address of the receiving unit 131-1 is recognized, and in step S94, an IP packet in which key information is arranged is transmitted wirelessly to the recognized IP address.

  In step S112, the receiving unit 131-1 is addressed to the receiving unit 131-1 in which the key information transmitted from the transmitting unit 22 is described in the TCP / IP payload portion, as in the case described in step S72 of FIG. The IP packet is received wirelessly. After that, the reception unit 131-1 divides the multiplication value s as key information by the prime number p stored in the memory 103 of the reception unit 131-1, obtains the prime number q, and uses the upper 104 bits as the WEP key. Set to. Then, the memory 103 of the receiving unit 131-1 stores the WEP key.

  Thereafter, in step S133, the receiving unit 131-2, like the case described in step S73 of FIG. 10, receives an IP packet in which an acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion. It transmits to the transmission unit 22 by radio. At this time, the reception unit 131-2 recognizes the IP address of the transmission unit 22, which is the destination of the transmission unit 22, from the IP packet received in step S132. That is, the IP packet transmitted by the transmission unit 22 includes the IP address of the transmission unit 22, and the reception unit 131-2 receives the IP packet from the transmission unit 22 received in step S132, and The IP address is recognized, and in step S133, an IP packet in which an acknowledge ACK is arranged is transmitted to the recognized IP address by radio.

  In step S95, the transmission unit 22 wirelessly receives an IP packet in which the acknowledge ACK transmitted from the reception unit 131-2 is described in the TCP / IP payload portion, as in the case described in step S53 of FIG. .

  In step S113, as in the case described in step S73 of FIG. 10, the reception unit 131-1 transmits an IP packet in which an acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion. 22 is transmitted wirelessly. At this time, the reception unit 131-1 recognizes the IP address of the transmission unit 22 that is the destination of the transmission unit 22 from the IP packet received in step S <b> 112. That is, the IP packet transmitted by the transmission unit 22 includes the IP address of the transmission unit 22, and the reception unit 131-1 receives the IP packet from the transmission unit 22 received in step S 112. The IP address is recognized, and in step S113, an IP packet in which an acknowledge ACK is arranged is transmitted wirelessly to the recognized IP address.

  In step S96, the transmission unit 22 wirelessly receives an IP packet in which the acknowledge ACK transmitted from the reception unit 131-1 is described in the TCP / IP payload portion, as in the case described in step S53 of FIG. The display unit 23 displays a message indicating the completion of the WEP key transmission to the two display devices 121-1 and 121-2. In step S97, the transmitting unit 22 transmits WEP keys to the two display devices 121-1 and 121-2 addressed to the receiving unit 131-2, similarly to the case described in step S54 of FIG. An IP packet of a message indicating the completion of is transmitted wirelessly.

  Here, the transmission unit 22 receives the acknowledgment ACK from the reception unit 131-1 and the reception unit 131-2, thereby transmitting the WEP key to the two reception units 131-1 and 131-2. Recognizing the completion, but there are two devices, the display device 121-1 and the display device 121-2, to which the WEP key should be transmitted. For example, an IP packet in which a WEP key transmission request is arranged is transmitted. Recognize by the number of devices that have been used.

  In step S134, similarly to the case described in step S74 of FIG. 10, the reception unit 131-2 wirelessly receives the IP packet transmitted by the transmission unit 22 in step S97, and is placed in the IP packet. A message indicating completion of WEP key transmission to the two display devices 121-1 and 121-2 is displayed on the display unit 133-2.

  In step S98, the transmission unit 22 completes the transmission of the WEP key to the two display devices 121-1 and 121-2 addressed to the reception unit 131-1, similarly to the case described in step S54 of FIG. An IP packet of a message representing is transmitted wirelessly.

  In step S114, similarly to the case described in step S74 of FIG. 10, the reception unit 131-2 wirelessly receives the IP packet transmitted by the transmission unit 22 in step S98, and is arranged in the IP packet 2 A message indicating completion of WEP key transmission to the two display devices 121-1 and 121-2 is displayed on the display unit 133-2.

  Thereafter, the user looks at the messages displayed on the display unit 23, the display unit 133-1, and the display unit 133-2, and switches the receiver 94, the switch 94, and the display devices 121-1 and 121-2. When 104 is operated downward, the transmission unit 22, the reception unit 131-1 and the reception unit 131-2 set their respective operation modes from the transmission mode to the normal mode. Then, the transmission unit 22, the reception unit 131-1 and the reception unit 131-2 encrypt the data to be transmitted to another device using the same WEP key (the upper 104 bits of the prime number q) and receive the received data. Is decrypted using the WEP key.

  Here, as described above, the transmission unit 22, the reception unit 131-1, and the reception unit 131-2 each perform wireless communication, but half-duplex communication is performed in wireless communication. Accordingly, the receiving unit 131-1 and the receiving unit 131-2 cannot simultaneously transmit a WEP key transmission request packet to the transmitting unit 22 (the transmitting unit 22 receives the receiving unit 131-1 and the receiving unit 131-2). For example, the transmission unit 22 waits for several seconds to several tens of seconds after receiving the last WEP key transmission request packet, and further receives from other reception units. Check if the WEP key transmission request packet is sent. When the WEP key transmission request is not transmitted, the transmission unit 22 sequentially transmits the key information to the reception unit 131-1 and the reception unit 131-2 that have transmitted the WEP key transmission request, and receives the key information. After receiving the key information normally, unit 131-1 and receiving unit 131-2 sequentially transmit an acknowledge ACK to transmitting unit 22.

  The receiving unit 131-1 and the receiving unit 131-2 transmit the WEP key transmission request to the transmitting unit 22, and the transmitting unit 22 transmits the key information to the receiving unit 131-1 and the receiving unit 131-2. The order of transmission, the order in which the receiving unit 131-1 and the receiving unit 131-2 transmit ACK to the transmitting unit 22, and the transmitting unit 22 transmits the WEP key to the receiving unit 131-1 and the receiving unit 131-2. The order in which messages indicating completion are transmitted is not necessarily the order shown in FIG.

  FIG. 13 shows a display example of a message indicating the completion of WEP key transmission displayed on the display unit 23 of the receiving device 12 of FIG.

  In FIG. 13, the display unit 23 includes a liquid crystal display unit 141 and a display lamp 142.

  In FIG. 11, when the transmission of the key information from the transmission unit 22 of the reception device 12 to the display device 131-1 and the display device 131-2 is completed, the liquid crystal display unit 141 includes two units as shown in FIG. “Key Transfer to 2 Units Completed”, which is a message indicating completion of WEP key transmission to the device, is displayed. Further, the display lamp 142 is composed of, for example, an LED (Light Emitting Diode), and blinks at the start of the transmission mode, for example, and lights up when transmission of the WEP key is completed.

  Thus, in the receiving apparatus 12, when the transmission of the WEP key is completed, the display lamp 142 is turned on. Therefore, the user can complete the transmission of the WEP key by checking whether the display lamp 42 is lit. You can know if you did. Further, since the number of display devices transmitted to the WEP key is displayed on the liquid crystal display unit 141, the user can transmit the WEP key to the number of display devices by viewing the display on the liquid crystal display unit 141. Can know. Then, when the transmission of the WEP key is not completed or the number of display devices to which the WEP key is transmitted is not as expected, the user, for example, the switch 94 of the receiving device 12, the display device 121-1, and By operating the switch 104 of the display device 121-2 downward once and then operating it again upward, the WEP key transmission / reception process can be performed again. At this time, the transmitting unit 22 of the receiving device 12 can use a new prime number different from the previously used prime number q as the prime number q used to obtain the multiplication value s as key information.

  FIG. 14 illustrates an example of a message that the transmission unit 22 transmits to the reception unit 131-1 and the reception unit 131-2.

  In FIG. 14, numbers at the beginning of each line and a colon symbol (:) are added for convenience of explanation.

  The <wep-key-transger> in the first line of the message in FIG. 14 and the </ wep-key-transger> in the fourth line are the fourth to the <wep-key-transger> in the first line of the message. This indicates that a message indicating completion of transmission of the WEP key is described up to </ wep-key-transger> on the line. Also, <transfer-completed no = ”0” yes ”1”> 1 </ transger-completed> in the second line indicates that the transmission of the WEP key has been completed, and <key-transgerred in the third line -units> 2 <key-transgerred-units> represents that the WEP key is transmitted to two devices (the display device 121-1 and the display device 121-2). If the transmission of the WEP key is not completed for some reason, <transfer-completed no = “0” yes ”1”> 0 </ transger-completed> on the second line.

  FIG. 15 shows an example of a display screen of a message indicating completion of WEP key transmission displayed on the display unit 133-1 by the reception unit 131-1 of the display device 121-1 that has received the message of FIG.

  In addition, although the display screen of the display part 133-1 is demonstrated in FIG. 15, the same display screen is displayed also on the display part 133-2.

  Since the message in FIG. 14 indicates the completion of transmission of the WEP key to the two devices, the display screen in FIG. 15 displays, for example, a message indicating the completion of transmission of the WEP key by OSD (Original Software Display) display. “Transmission of encryption key to two devices completed” is displayed.

  As described above, in the display device 121-1, the number of devices to which the WEP key has been transmitted is displayed on the display unit 133-1. Therefore, the user can see how many units are displayed by viewing the display on the display unit 133-1. It is possible to know whether the WEP key is transmitted to the device. If the number of devices to which the WEP key is transmitted is not as expected, the user lowers the switch 94 of the receiving device 12 and the switch 104 of the display device 121-1 and the display device 121-2 once. The WEP key transmission / reception process can be performed again by operating the side and operating the side upward again.

  FIG. 16 illustrates a configuration example of an AV wireless transmission / reception system including two reception devices 161-1, a reception device 161-2, and one display device 13.

  1, that is, the display device 13 and the remote controller 14 shown in FIG. 16 are the same as those shown in FIG.

  16 includes a tuner 171-1, a transmission unit 172-1, and a display unit 173-1, and a tuner 171-2, a transmission unit 172-2, and a display unit 173-2 of the reception device 161-2. 1 correspond to the tuner 21, the transmission unit 22, and the display unit 23 of the receiving device 12 in FIG. 1, and the same processing as that of the tuner 21, the transmission unit 22, and the display unit 23 of the receiving device 12 in FIG. To do. However, the tuner 171-1 and the tuner 171-2 receive different broadcast signals, for example. That is, the tuner 171-1 receives, for example, a terrestrial digital broadcast signal, and the tuner 171-2 receives, for example, a BS or CS (Communication Satellite) signal.

In addition, a predetermined prime number q ₁ is stored in the memory 93 of the transmission unit 172-1 as a prime number q of a total of 160 bits, the upper 104 bits being configured by the WEP key, and the memory 93 of the transmission unit 172-2 is stored in the memory 93. , Q ₂ different from the prime number q ₁ is stored.

  Next, with reference to FIG. 17, in the AV wireless transmission / reception system of FIG. 16, between the transmission unit 172-1 of the reception device 161-1 and the reception unit 31 of the display device 13 performed in the transmission mode, and the reception device A transmission / reception process of key information between the transmission unit 172-2 of 161-2 and the reception unit 31 of the display device 13 will be described.

  In the transmission / reception of key information between the transmission unit 172-1 and the reception unit 31 and between the transmission unit 172-2 and the reception unit 31, the MAC of FIG. A frame is used. The MAC frame in FIG. 7 includes an IP header, that is, includes an IP packet. Therefore, for the exchange of the IP packet, the transmitting unit 172-1, the transmitting unit 172-2, and the receiving unit are included. The unit 31 needs to be set with an IP address.

  For example, as described above, setting of IP addresses for the transmission unit 172-1, the transmission unit 172-2, and the reception unit 31 may be performed by the user or by a DHCP server or APIPA. However, for example, it is assumed that the IP address is set in the transmission unit 172-1, the transmission unit 172-2, and the reception unit 31 by APIPA.

  In step S191, the receiving unit 31 transmits a MAC frame (FIG. 7) in which the WEP key transmission request is described in the TCP / IP payload part to the transmitting unit 172-1 and the transmitting unit, as described in step S71 of FIG. It is transmitted wirelessly to 172-2.

  That is, in step S191, each IP packet addressed to all IP addresses that can be set by APIPA (except for the IP address of the own device (reception unit 31)) is transmitted wirelessly.

  In step S151, as in the case described in step S51 of FIG. 10, the transmission unit 172-1 is addressed to itself among the IP packets transmitted by the reception unit 31 in step S191, that is, to the transmission unit 172-1. An IP packet addressed to the assigned IP address is received wirelessly.

  In step S171, as in the case described in step S51 of FIG. 10, the transmission unit 172-2 is addressed to itself among the IP packets transmitted by the reception unit 31 in step S191, that is, to the transmission unit 172-2. An IP packet addressed to the assigned IP address is received wirelessly.

In step S152, the transmitter 172-1 responds to the WEP key transmission request placed in the IP packet received in step S151 in the same manner as described in step S52 of FIG. The IP packet (which is a MAC frame) in which the key information, which is the multiplication value s ₁ of the prime p stored in 93 and the prime q ₁ , is described in the TCP / IP payload portion is wirelessly transmitted to the receiving portion 31. Send with. At this time, the transmission unit 172-1 recognizes the IP address of the reception unit 31 that is the destination of the reception unit 31 from the IP packet received in step S151. That is, the IP packet transmitted by the receiving unit 31 includes the IP address of the receiving unit 31, and the transmitting unit 172-1 receives the IP packet from the receiving unit 31 received in step S151. The IP address is recognized, and in step S152, an IP packet in which key information is arranged is transmitted wirelessly to the recognized IP address.

In step S192, the reception unit 31 sends the key information transmitted from the transmission unit 172-1 to the reception unit 31 described in the TCP / IP payload unit, as in the case described in step S72 of FIG. IP packets are received wirelessly. After that, the receiving unit 31 divides the multiplication value s ₁ as key information by the prime number p stored in the memory 103 to obtain the prime number q ₁ , and sets the higher 104 bits in the WEP key. Then, the memory 103 of the reception unit 31 stores the WEP key in association with the reception device 161-1.

In step S172, the transmitter 172-2 responds to the WEP key transmission request placed in the IP packet received in step S171 in the same manner as described in step S52 of FIG. The IP packet (which is a MAC frame) in which the key information, which is the multiplication value s ₂ of the prime number p and the prime number q ₂ stored in 93, is described in the TCP / IP payload portion is wirelessly transmitted to the receiving portion 31. Send with. At this time, the transmission unit 172-2 recognizes the IP address of the reception unit 31 that is the destination of the reception unit 31 from the IP packet received in step S171. That is, the IP packet transmitted by the receiving unit 31 includes the IP address of the receiving unit 31, and the transmitting unit 172-2 receives the IP packet from the receiving unit 31 received in step S171. The IP address is recognized, and in step S172, an IP packet in which key information is arranged is transmitted wirelessly to the recognized IP address.

In step S193, the reception unit 31 sends the key information transmitted from the transmission unit 172-2 to the reception unit 31 described in the TCP / IP payload unit, as in the case described in step S72 of FIG. IP packets are received wirelessly. After that, the receiving unit 31 divides the multiplication value s ₂ as key information by the prime number p stored in the memory 103 to obtain the prime number q ₂ , and sets the higher 104 bits in the WEP key. Then, the memory 103 of the receiving unit 31 stores the WEP key in association with the receiving device 161-2.

  Thereafter, in step S194, the receiving unit 31 transmits an IP packet in which an acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion, as in the case described in step S73 of FIG. Wirelessly transmit to 172-1. At this time, the reception unit 31 recognizes the IP address of the transmission unit 172-1 that is the destination of the transmission unit 172-1 based on the IP packet received in step S192. That is, the IP packet transmitted by the transmission unit 172-1 includes the IP address of the transmission unit 172-1, and the reception unit 31 uses the IP packet from the transmission unit 172-1 received in step S192, The IP address of the transmission unit 172-1 is recognized, and in step S194, an IP packet in which an acknowledge ACK is arranged is transmitted to the recognized IP address wirelessly.

  In step S153, as in the case described in step S53 of FIG. 10, the transmission unit 172-1 wirelessly receives an IP packet in which the acknowledge ACK transmitted from the reception unit 31 is described in the TCP / IP payload portion. The display unit 173-1 displays a message indicating completion of WEP key transmission to one display device 13.

  In step S195, similarly to the case described in step S73 of FIG. 10, the reception unit 31 transmits an IP packet in which an acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion, to the transmission unit 172- 2 is transmitted wirelessly. At this time, the reception unit 31 recognizes the IP address of the transmission unit 172-2, which is the destination of the transmission unit 172-2, based on the IP packet received in step S193. That is, the IP packet transmitted by the transmission unit 172-2 includes the IP address of the transmission unit 172-2, and the reception unit 31 uses the IP packet from the transmission unit 172-2 received in step S193, Recognizing the IP address of the transmission unit 172-2, in step S195, an IP packet in which an acknowledge ACK is arranged is wirelessly transmitted to the recognized IP address.

  In step S173, the transmission unit 172-2 receives the IP packet in which the acknowledge ACK transmitted from the reception unit 31 is described in the TCP / IP payload portion by radio, similarly to the case described in step S53 of FIG. The display unit 173-2 displays a message indicating the completion of WEP key transmission to one display device 13.

  In step S154, the transmission unit 172-1 wirelessly transmits an IP packet of a message indicating completion of WEP key transmission to one display device 13 to the reception unit 31, as in the case described in step S54 of FIG. Send with.

  In step S196, the reception unit 31 wirelessly receives the IP packet transmitted by the transmission unit 172-1 in step S154, as in the case described in step S74 of FIG. A message indicating completion of transmission of the WEP key to one display device 13 is displayed on the display unit 33.

  In step S174, the transmission unit 172-2 wirelessly transmits an IP packet of a message indicating completion of transmission of the WEP key to one display device 13 to the reception unit 31, as in the case described in step S54 of FIG. Send.

  In step S197, similarly to the case described in step S74 of FIG. 10, the reception unit 31 wirelessly receives the IP packet transmitted by the transmission unit 172-2 in step S174, and the WEP arranged in the IP packet is received. A message indicating completion of key transmission is displayed on the display unit 33.

Thereafter, the user sees the messages displayed on the display unit 173-1, the display unit 173-2, and the display unit 33, and the switch 94 of the reception device 161-1 and the reception device 161-2, and the display device 13 When switch 104 is operated downward, transmission unit 172-1, transmission unit 172-2, and reception unit 31 set their respective operation modes from the transmission mode to the normal mode. And, between the transmitting unit 172-1 and the receiving unit 31, data transmitted from one to the other is encrypted using the WEP key is the upper 104-bit prime q _1, a transmission unit 172-2 The data transmitted from one to the other is encrypted with the receiving unit 31 using the WEP key which is the upper 104 bits of the prime number q ₂ , and the received data is decrypted using the WEP key. That is, when exchanging data with the receiving device 171-1 or the receiving device 171-2, the receiving unit 31 performs encryption and decryption using a WEP key stored in association with each other.

  Note that the order in which the reception unit 31 transmits the WEP key transmission request to the transmission unit 172-1 and the transmission unit 172-2, and the transmission unit 172-1 and the transmission unit 172-2 provide key information to the reception unit 31. The order of transmission, the order in which the reception unit 31 transmits ACK to the transmission unit 172-1 and the transmission unit 172-2, and the transmission unit 172-1 and transmission unit 172-2 transmit the WEP key to the reception unit 31. The order in which messages indicating completion are transmitted is not necessarily the order shown in FIG.

In the above description, the prime number q ₁ stored in the memory 93 of the reception device 161-1 is different from the prime number q ₂ stored in the memory 93 of the reception device 161-2, but the reception device 161- 1 and the memory 93 of the receiving device 161-2 may store a prime number q including the same WEP key.

  In FIG. 16 and FIG. 17 described above, the key information is transmitted from the receiving device 161-1 and the receiving device 161-2 to the display device 13, but the upper 104 bits are transmitted from the WEP key to the memory 103 of the display device 13. The configured prime number q may be stored, and the WEP key may be transmitted from the display device 13 to the receiving device 161-1 and the receiving device 161-2. Further, the prime number q may be stored in one of the receiving device 161-1 and the receiving device 161-2, and the WEP key may be transmitted from one to the display device 13, and the WEP key may be transmitted from the display device 13 to the other. .

  FIG. 18 illustrates a configuration example of an AV wireless transmission / reception system in which a WEP key is transmitted from the reception device 161-1 to the display device 13 and a WEP key is transmitted from the display device 13 to the reception device 161-2.

  In addition, what attached | subjected the code | symbol same as FIG. 16, ie, the display apparatus 13, the remote controller 14, the receiver 161-1, and the receiver 161-2 of FIG. 16, are the same as those of FIG. The description will be omitted because it will be repeated.

  However, the prime number p and the prime number q including the WEP key are stored in the memory 93 of the transmission unit 172-1 in advance, but only the prime number p is stored in the memory 93 of the transmission unit 172-2. .

  Next, with reference to FIG. 19, in the AV wireless transmission / reception system of FIG. 18, between the transmission unit 172-1 of the reception device 161-1 and the transmission unit 172-2 of the reception device 161-2 performed in the transmission mode. The key information transmission / reception processing between the transmission unit 172-2 of the reception device 161-2 and the reception unit 31 of the display device 13 will be described.

  In the transmission / reception of key information between the transmission unit 172-1 and the reception unit 31 and between the transmission unit 172-2 and the reception unit 31, the MAC of FIG. A frame is used. The MAC frame in FIG. 7 includes an IP header, that is, includes an IP packet. Therefore, for the exchange of the IP packet, the transmitting unit 172-1, the transmitting unit 172-2, and the receiving unit are included. The unit 31 needs to be set with an IP address.

  For example, as described above, setting of IP addresses for the transmission unit 172-1, the transmission unit 172-2, and the reception unit 31 may be performed by the user or by a DHCP server or APIPA. However, for example, it is assumed that the IP address is set in the transmission unit 172-1, the transmission unit 172-2, and the reception unit 31 by APIPA.

  For example, the user operates the switch 94 of the reception device 161-1 and the switch 104 of the display device 13 to set the reception device 161-1 and the display device 13 to the transmission mode.

  In this case, in step S251, the receiving unit 31 transmits a MAC frame (FIG. 7) in which the WEP key transmission request is described in the TCP / IP payload portion as in the case described in step S71 of FIG. To wirelessly.

  That is, in step S251, the receiving unit 31 wirelessly transmits each IP packet addressed to all IP addresses that can be set by APIPA (except for the IP address of the own device (receiving unit 31)). .

  In step S211, the transmission unit 172-1 is addressed to itself among the IP packets transmitted by the reception unit 31 in step S251, that is, to the transmission unit 172-1, as in the case described in step S51 of FIG. An IP packet addressed to the assigned IP address is received wirelessly. In step S212, the transmission unit 172-1 responds to the WEP key transmission request arranged in the IP packet in the memory 93 of the transmission unit 172-1 in the same manner as described in step S52 of FIG. An IP packet (which is a MAC frame) in which key information, which is a multiplication value s of the stored prime number p and prime number q, is described in the TCP / IP payload portion is transmitted to the receiving portion 31 wirelessly. At this time, the transmission unit 172-1 recognizes the IP address of the reception unit 31 that is the destination of the reception unit 31 from the IP packet received in step S211. That is, the IP packet transmitted by the receiving unit 31 includes the IP address of the receiving unit 31, and the transmitting unit 172-1 receives the IP packet from the receiving unit 31 received in step S211. The IP address is recognized, and in step S212, an IP packet in which key information is arranged is transmitted wirelessly to the recognized IP address.

  In step S252, as in the case described in step S72 of FIG. 10, the receiving unit 31 receives the IP address addressed to the receiving unit 31 in which the key information transmitted from the transmitting unit 172-1 is described in the TCP / IP payload unit. Receive packets wirelessly. After that, the receiving unit 31 divides the multiplication value s as key information by the prime number p stored in the memory 103 to obtain the prime number q, and sets the higher 104 bits in the WEP key. The memory 103 of the receiving unit 31 stores the WEP key and the prime number q. Thereafter, in step S253, the receiving unit 31 transmits a packet in which the acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion, as in the case described in step S73 of FIG. -1 is transmitted wirelessly. At this time, the reception unit 31 recognizes the IP address of the transmission unit 172-1 that is the destination of the transmission unit 172-1 based on the IP packet received in step S252. That is, the IP packet transmitted by the transmission unit 172-1 includes the IP address of the transmission unit 172-1, and the reception unit 31 uses the IP packet from the transmission unit 172-1 received in step S252, The IP address of the transmission unit 172-1 is recognized, and in step S253, an IP packet in which an acknowledge ACK is arranged is transmitted to the recognized IP address wirelessly.

  In step S213, the transmission unit 172-1 wirelessly receives an IP packet in which the acknowledge ACK transmitted from the reception unit 31 is described in the TCP / IP payload portion, similarly to the case described in step S53 of FIG. A message indicating that the transmission of the WEP key to one display device 13 is completed is displayed on the display unit 173-1. In step S214, the transmission unit 172-1 wirelessly transmits an IP packet of a message indicating the completion of transmission of the WEP key to one display device 13 to the reception unit 31, as described in step S54 of FIG. Send with.

  In step S254, the receiving unit 31 receives the IP packet transmitted by the transmitting unit 172-1 in step S214, as described in step S74 of FIG. 10, and one display device arranged in the IP packet. A message indicating completion of transmission of the WEP key to 13 is displayed on the display unit 33.

  Thereafter, when the user operates the switch 94 of the reception device 161-2 and the switch 104 of the display device 13 to set the reception device 161-2 and the display device 13 to the transmission mode, for example, in step S231, the transmission unit 172 -2 wirelessly transmits the MAC frame (FIG. 7) in which the WEP key transmission request is described in the TCP / IP payload section to the receiving section 31.

  In step S231, as in step S251, the transmission unit 172-2 transmits each IP packet addressed to all IP addresses that can be set by APIPA except the IP address of its own device (transmission unit 172-2). The arranged MAC frame) is transmitted wirelessly.

  In step S255, the receiving unit 31 wirelessly receives an IP packet addressed to itself, that is, an IP address assigned to the IP address assigned to the receiving unit 31 among the IP packets transmitted by the transmitting unit 172-1 in step S231. In step S256, in response to the WEP key transmission request arranged in the IP packet, the reception unit 31 multiplies the prime number p stored in the memory 103 and the prime number q stored in step S252. An IP packet in which the key information is described in the TCP / IP payload portion (which is a MAC frame) is wirelessly transmitted to the transmission portion 172-2. At this time, the reception unit 31 recognizes the IP address of the transmission unit 172-2, which is the destination of the transmission unit 172-2, based on the IP packet received in step S255. That is, the IP packet transmitted by the transmission unit 172-2 includes the IP address of the transmission unit 172-2, and the reception unit 31 receives the IP packet from the reception unit 31 received in step S255. In step S256, an IP packet in which key information is arranged is transmitted wirelessly to the recognized IP address.

  In step S232, the transmission unit 172-2 wirelessly receives an IP packet addressed to the transmission unit 172-2 in which the key information transmitted from the reception unit 31 is described in the TCP / IP payload portion. After that, the transmission unit 172-2 divides the multiplication value s as key information by the prime number p stored in the memory 93 of the transmission unit 172-2 to obtain the prime number q, and the higher 104 bits are obtained as WEP. Set to key. Then, the memory 93 of the receiving unit 31 stores the WEP key. Thereafter, in step S233, the transmission unit 172-2 wirelessly transmits a packet in which an acknowledge ACK indicating that the key information has been normally received is described in the TCP / IP payload portion to the reception unit 31. At this time, the transmission unit 172-2 recognizes the IP address of the reception unit 31 that is the destination of the reception unit 31 from the IP packet received in step S232. That is, the IP packet transmitted by the receiving unit 31 includes the IP address of the receiving unit 31, and the transmitting unit 172-2 receives the IP packet from the receiving unit 31 received in step S232. The IP address is recognized, and in step S233, an IP packet in which an acknowledge ACK is arranged is transmitted to the recognized IP address by radio.

  In step S257, the reception unit 31 wirelessly receives an IP packet in which the acknowledge ACK transmitted from the transmission unit 172-2 is described in the TCP / IP payload portion, and receives a WEP key to one reception device 161-2. A message indicating that the transmission is completed is displayed on the display unit 33. In step S258, the reception unit 31 wirelessly transmits an IP packet of a message indicating completion of transmission of the WEP key to one reception device 161-2 to the transmission unit 172-2.

  In step S234, the transmission unit 172-2 wirelessly receives the IP packet transmitted by the reception unit 31 in step S258, and completes transmission of the WEP key to one reception device 161-2 arranged in the IP packet. A message to be displayed is displayed on the display unit 173-2.

  Thereafter, the user looks at the messages displayed on the display unit 173-1, the display unit 173-2, and the display unit 33, and sets the switch 94 and the switch 104 of the reception device 161-1 and the reception device 161-2 on the lower side. When the operation is performed, the transmission unit 172-1, the transmission unit 172-2, and the reception unit 31 set the operation mode from the transmission mode to the normal mode. And between the transmission unit 172-1, the transmission unit 172-2, and the reception unit 31, the data transmitted from one to the other is encrypted and received using the WEP key which is the upper 104 bits of the prime number q. Decrypt data using its WEP key.

  In the description of FIG. 19, the WEP key transmitted from the receiving unit 31 to the transmitting unit 172-2 is the same as the WEP key transmitted from the transmitting unit 172-1 to the receiving unit 31, but the receiving unit 31 is Instead of the WEP key transmitted from the transmission unit 172-1, a new WEP key can be generated, and the WEP key can be transmitted to the transmission unit 172-2.

  Further, in the above description, the prime number p and the prime number q in which the upper 104 bits constitute the WEP key are 160 bits, but may not be 160 bits. However, in order to increase the difficulty of prime factorization of the multiplication value s of the prime number p and the prime number q (difficulty in decoding the WEP key), the prime number p and the prime number q are preferably 160 bits or more. Also, although the WEP key is 104 bits, any number of bits may be used as long as it is within the range of the prime number q.

  FIG. 20 shows another configuration example of the transmission unit 22 and the reception unit 31 of the AV wireless transmission / reception system 1 of FIG.

  The transmission unit 22 includes an MPEG encoder 51, a CPU 91, a wireless transmission / reception module 92, a switch 94, and a memory 201. The receiving unit 31 includes an MPEG decoder 73, a wireless transmission / reception module 101, a CPU 102, a switch 104, and a memory 211.

  6, that is, the MPEG encoder 51, the MPEG decoder 73, the CPU 91, the wireless transmission / reception module 92, the switch 94, the wireless transmission / reception module 101, the CPU 102, and the switch 104 in FIG. Since these are the same as those described above and the description will be repeated, they will be omitted as appropriate.

  In the transmission unit 22 of FIG. 20, the memory 201 stores a 160-bit prime number p in FIG. 6 and a 160-bit prime number q for the WEP key whose upper 104 bits are WEP keys in advance, instead of the 160-bit prime number. t (first value), prime number u (second value), and one or more WEP keys v (encryption key) are stored in advance. The memory 211 of the receiving unit 31 stores in advance a prime number t and a prime number u that are the same as the prime number t and the prime number u stored in the memory 201, instead of the 160-bit prime number p.

  The WEP key v does not have to be a prime number and may be an arbitrary value. The WEP key v can be generated by a random number generator (not shown) of the transmission unit 22, for example.

  21 reads out the prime number t, prime number u, and WEP key v stored in the memory 201, and multiplies the prime number t by the WEP key v. Further, the multiplication value is divided by the prime number u, and the remainder w obtained as a result of the division is transmitted to the reception unit 31 via the wireless transmission / reception module 92 as key information regarding the WEP key v. On the other hand, the CPU 102 of the reception unit 31 in FIG. 20 reads the prime number t and the prime number u stored in the memory 211 and obtains the WEP key v using the prime number t, the prime number u, and the remainder w received from the transmission unit 22. .

  20 transmits the result of calculation using the WEP key v directly to the receiving unit 31, the WEP key v only needs to be stored in the memory 201 of the transmitting unit 22. The time for calculating the prime number q can be omitted as compared with the case where the prime number q of a total of 160 bits in which the upper 104 bits constitute the WEP key is stored in the memory 93 of FIG.

  In addition, since the remainder obtained as a result of calculation using the WEP key v is wirelessly transmitted to the reception unit 31 in the transmission unit 22 in FIG. 20, the multiplication value s for obtaining the WEP key by prime factorization is transmitted. 6 can transmit the WEP key v to the receiving unit 31 more safely.

  Note that the wireless AV transmission / reception system 1 including the reception device 12 including the transmission unit 22 and the display device 13 including the reception unit 31 illustrated in FIG. 20 is similar to the case of FIG. The device 13 can be configured.

  In addition, the WEP key transmission / reception processing of the transmission unit 22 and the reception unit 31 in FIG. 20 can be performed in the same manner as in FIG. 8 to FIG. 10, but the display unit 23 of the reception device 12 or the display unit 33 of the display device 13 When the user determines that the error is due to the displayed WEP key transmission completion message and instructs the WEP key transmission / reception process to be performed again, the CPU 91 of the transmission unit 22 does not use the new prime q, The remainder w calculated as a result of using the new WEP key v is transmitted to the receiving unit 31. Here, a plurality of WEP keys can be stored in the memory 201 in advance, and any one of them can be used as a new WEP key v. It is also possible to generate a random number in the transmission unit 22 and use the random number as a new WEP key.

  As in the case of using the prime numbers p and q, it is possible to further increase the difficulty of decrypting the WEP key by increasing the number of bits of the prime numbers t and u.

  FIG. 21 shows still another configuration example of the transmission unit 22 and the reception unit 31 of the AV wireless communication system 1 of FIG.

  The transmission unit 22 includes an MPEG encoder 51, a CPU 91, a wireless transmission / reception module 92, a switch 94, a memory 201, and a network card (NIC) 231. The reception unit 31 includes a CPU 102, an MPEG decoder 73, a wireless transmission / reception module 101, a switch 104, a memory 211, and a network card 241.

  20 with the same reference numerals as in FIG. 20, that is, MPEG encoder 51, CPU 91, wireless transmission / reception module 92, switch 94, MPEG decoder 73, wireless transmission / reception module 101, CPU 102, switch 104, memory 201 in FIG. The memory 211 is the same as that shown in FIG. 20, and the description thereof will be repeated.

  21 includes a network card 231 and a network card 241, respectively. The network card 231 and the network card 241 are connected via a LAN (Local Area Network) cable 251. Yes. The network card 231 and the network card 241 perform communication based on, for example, the IEEE 802.3 standard.

  In the transmission mode, the CPU 91 multiplies the prime number t and the WEP key v, and supplies the remainder w obtained by dividing the multiplication value by the prime number u to the network card 231. The network card 231 is connected to the LAN cable 251. Then, the remainder w is transmitted to the network card 241 of the receiving unit 31. That is, the transmission unit 22 transmits the key information to the reception unit 31 via a LAN cable 251 instead of wirelessly. As a result, wireless interception of the WEP key can be prevented, and the decryption resistance can be further enhanced.

  In the embodiment of FIG. 21, it is possible to employ a multiplication value s of the prime number p and the prime number q including the WEP key, instead of the remainder w, as the key information. In addition, the wireless AV transmission / reception system 1 including the reception device 12 including the transmission unit 22 and the display device 13 including the reception unit 31 illustrated in FIG. The device 13 can be configured. In this case, however, the plurality of receiving devices 12 or display devices 13 need to be connected by the LAN cable 251 via, for example, a router or a hub.

  Next, a series of processing according to the flowchart described above is performed by the CPU 91 and the CPU 102 executing a program as software, but the series of processing can also be performed by dedicated hardware. A series of processing can be performed by installing a program in a general-purpose computer or the like.

  Therefore, FIG. 22 shows a configuration example of an embodiment of a computer in which a program for executing the series of processes described above is installed.

  The program can be recorded in advance in a hard disk 905 or a ROM 903 as a recording medium built in the computer.

  Alternatively, the program is stored temporarily on a removable recording medium 911 such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), an MO (Magneto Optical) disk, a DVD (Digital Versatile Disc), a magnetic disk, or a semiconductor memory. It can be stored permanently (recorded). Such a removable recording medium 911 can be provided as so-called package software.

  The program is installed on the computer from the removable recording medium 911 as described above, or transferred from the download site to the computer wirelessly via a digital satellite broadcasting artificial satellite, or a LAN (Local Area Network), The program can be transferred to a computer via a network such as the Internet. The computer can receive the program transferred in this way by the communication unit 908 and install it in the built-in hard disk 905.

  The computer includes a CPU (Central Processing Unit) 902. An input / output interface 910 is connected to the CPU 902 via a bus 901, and the CPU 902 operates an input unit 907 including a keyboard, a mouse, a microphone, and the like by the user via the input / output interface 910. When a command is input as a result, the program stored in a ROM (Read Only Memory) 903 is executed accordingly. Alternatively, the CPU 902 may be a program stored in the hard disk 905, a program transferred from a satellite or a network, received by the communication unit 908 and installed in the hard disk 905, or a removable recording medium 911 attached to the drive 909. The program read and installed in the hard disk 905 is loaded into a RAM (Random Access Memory) 904 and executed. Thereby, the CPU 902 performs processing performed by the configuration of blocks other than the CPU in the block diagram described above. Then, the CPU 902 outputs the processing result from the output unit 906 configured with an LCD (Liquid Crystal Display), a speaker, or the like via the input / output interface 910, or from the communication unit 908 as necessary. Transmission, and further recording on the hard disk 905 is performed.

  Here, in this specification, the processing steps for describing a program for causing a computer to perform various types of processing do not necessarily have to be processed in time series according to the order described in the flowchart, but in parallel or individually. This includes processing to be executed (for example, parallel processing or processing by an object).

  Further, the program may be processed by a single computer, or may be processed in a distributed manner by a plurality of computers. Furthermore, the program may be transferred to a remote computer and executed.

  The key information may be transmitted after being encrypted with a common WEP key prepared in advance.

  In FIG. 16, as described above, the display device 13 associates the receiving device 161-1 (information thereof) with its WEP key, and associates the receiving device 161-2 (information thereof) with its WEP key. For example, a MAC address can be used as information on the receiving device 161-1 or the receiving device 161-2. In this case, the display device 13 decodes the MAC frame from the reception device 161-1 using the WEP key associated with the MAC address of the transmission source, and the MAC frame from the reception device 161-2. Decryption is performed using the WEP key associated with the source MAC address. In addition, the display device 13 encrypts the MAC frame addressed to the receiving device 161-1 or the receiving device 161-2 using the WEP key associated with the destination MAC address.

  Furthermore, as the switch 94 and the switch 104, for example, a mechanical switch that can be operated by the user can be used, or an electrical switch that works in conjunction with power-on can be used. In this case, when the power is turned on, the operation mode is set to the transmission mode, and after the transmission / reception of the key information, the normal mode is set.

  Further, for example, in FIG. 6, the WEP key transmission completion message is not displayed on both the display unit 23 of the reception device 12 and the display unit 33 of the display device 13, but only on one of them. It may be.

  Furthermore, the IP addresses of the receiving device 12 and the display device 13 are recognized by sending an IP packet to all IP addresses that can be set by APIPA, sending a PING by a PING command, and receiving the response. It is also possible to do this.

  Further, for example, the AV wireless transmission / reception system 1 of FIG. 1 can be applied to, for example, a wireless television. Instead of the receiving device 12, for example, a VTR (Video Tape Recorder), an HDD recorder, a DVD player, or the like can be employed. In addition, a printer, a speaker, or the like can be employed instead of the display device 13.

  Further, although the receiving device 12 and the display device 13 perform wireless communication conforming to the IEEE802.11 standard, other wireless communication may be performed.

  In the above description, key information is generated using prime numbers (p, q, etc.), but key information can also be generated using values that are not prime numbers.

  Further, the encryption method is not limited to the one using the WEP key.

It is a figure which shows the structural example of one Embodiment of AV radio | wireless transmission / reception system to which this invention is applied. FIG. 2 is a block diagram illustrating a configuration example of a transmission unit and a reception unit in FIG. 1 when a WEP key is set in advance at the time of factory shipment. FIG. 3 is a diagram for explaining processing in which the CPU of FIG. 2 converts TS packets into MAC frames. It is a figure which shows the example of a format of a MAC frame. It is a figure which shows the frame control of FIG. It is a block diagram which shows the other structural example of the transmission part of the AV radio | wireless transmission / reception system of FIG. It is a figure which shows the outline | summary of the format of the MAC frame produced | generated when CPU of the transmission part of FIG. 6 transmits key information. It is a flowchart explaining the process performed when the transmission part of FIG. 6 transmits key information. It is a flowchart explaining the process performed when the receiving part of FIG. 6 receives key information. 7 is a flowchart for explaining a transmission / reception process of key information between a transmission unit and a reception unit in FIG. 6. It is a figure which shows the structural example of AV radio | wireless transmission / reception system comprised from one receiving apparatus and two display apparatuses. It is a flowchart explaining the transmission / reception process of the key information between the transmission part of FIG. 11, and a reception part. It is a figure which shows the example of a display of the message showing the completion of WEP key transmission displayed on the display part of FIG. It is a figure which shows the example of the message which the transmission part of FIG. 11 transmits to a receiving part. It is a figure which shows the example of the display screen of the message showing the WEP key transmission completion which the receiving part which received the message of FIG. 14 displays on a display part. It is a figure which shows the structural example of AV radio | wireless transmission / reception system comprised from two receiving apparatuses and one display apparatus. It is a flowchart explaining the transmission / reception process of the key information between the transmission part of FIG. 16, and a reception part. It is a figure which shows the structural example of AV radio | wireless transmission / reception system comprised from two receiving apparatuses and one display apparatus. It is a flowchart explaining the transmission / reception process of the key information between the transmission part of FIG. 18, and a reception part. 3 shows another configuration example of the transmission unit and the reception unit of the AV wireless transmission / reception system of FIG. 3 shows still another configuration example of the transmission unit and the reception unit of the AV wireless communication system of FIG. It is a block diagram which shows the structural example of one Embodiment of the computer to which this invention is applied.

Explanation of symbols

  11 antenna coaxial cable, 12 receiver, 13 display, 14 remote controller, 21 tuner, 22 transmitter, 23 display, 31 receiver, 32 light receiver, 33 display, 51 MPEG encoder, 73 MPEG decoder, 91 CPU , 92 wireless transceiver module, 93 memory, 94 switch, 101 wireless transceiver module, 102 CPU, 103 memory, 901 bus, 902 CPU, 903 ROM, 904 RAM, 905 hard disk, 906 output unit, 907 input unit, 908 communication unit, 909 drive, 910 input / output interface, 911 removable recording medium

Claims (19)

In an information processing apparatus that transmits or receives data wirelessly,
Setting means for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
An information processing apparatus comprising: transmission means for transmitting encryption key information related to the encryption key when the transmission mode is set by the setting means. The information processing apparatus according to claim 1, wherein the setting unit sets the operation mode to the transmission mode according to an operation of a mechanical switch. When the power is turned on, the setting unit sets the operation mode to the transmission mode, and after the encryption key information is transmitted by the transmission unit, the operation mode is set to the data using the encryption key. The information processing apparatus according to claim 1, wherein the information processing apparatus is set to a normal mode for encryption or decryption. The information processing apparatus according to claim 1, wherein the encryption key information is a value obtained by multiplying a first value that is a prime number and a second value that is a prime number including the encryption key. The said encryption key information is a remainder obtained by dividing the product of the first value that is a prime number and the encryption key by the second value that is a prime number. Information processing device. The information processing apparatus according to claim 1, wherein the transmission unit transmits the encryption key information wirelessly or by wire. In an information processing method of an information processing apparatus that transmits or receives data wirelessly,
A setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
An information processing method comprising: a transmission step of transmitting encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step. In a program that causes a computer to perform processing to transmit or receive data wirelessly,
A setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
A transmission control step for controlling transmission of encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step. In a recording medium on which a program for causing a computer to perform processing of transmitting or receiving data wirelessly is recorded,
A setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
And a transmission control step for controlling transmission of encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step. In an information processing apparatus that transmits or receives data wirelessly,
Setting means for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
An information processing apparatus comprising: receiving means for receiving encryption key information related to the encryption key when the transmission mode is set by the setting means. The information processing apparatus according to claim 10, wherein the setting unit sets the operation mode to the transmission mode according to an operation of a mechanical switch. When the power is turned on, the setting means sets the operation mode to the transmission mode, and after the encryption key information is received by the reception means, the operation mode is set to the data using the encryption key. The information processing apparatus according to claim 10, wherein the information processing apparatus is set to a normal mode for encryption or decryption. The information processing apparatus according to claim 10, wherein the encryption key information is a value obtained by multiplying a first value that is a prime number and a second value that is a prime number including the encryption key. The said encryption key information is the remainder obtained by dividing the multiplication value of the 1st value which is a prime number, and the said encryption key by the 2nd value which is a prime number. Information processing device. 11. The storage device according to claim 10, further comprising: a storage unit that stores the encryption key obtained based on the encryption key information received by the reception unit in association with a device that has transmitted the encryption key information. The information processing apparatus described. The information processing apparatus according to claim 10, wherein the reception unit transmits the encryption key information wirelessly or by wire. In an information processing method of an information processing apparatus that transmits or receives data wirelessly,
A setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
And a receiving step of receiving encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step. In a program that causes a computer to perform processing to transmit or receive data wirelessly,
A setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
A reception control step of controlling reception of encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step. In a recording medium on which a program for causing a computer to perform processing of transmitting or receiving data wirelessly is recorded,
A setting step for setting an operation mode to a transmission mode for transmitting an encryption key used for encryption or decryption of the data;
And a reception control step for controlling reception of encryption key information related to the encryption key when the transmission mode is set by the processing of the setting step.

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