JPH10224340A - Radio communication method and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication method and a radio communication system in which secrecy of information to be sent/received between a master set and a specific slave set is enhanced. SOLUTION: A master set encrypts a hop table in the frequency hopping system through the public key system (step S8) by using a public key from a slave set (step S7) and transmits the information to the slave set (step S9), the slave set uses a private key to decode the information and then both the master set and the slave set share the hop table in common and send/receive information by the frequency whipping system (step S13). Furthermore, both the master set and the slave set are provided with a hop table generator ad send/receives only an initial value encrypted by the public key encryption system and generate the hop table by using the initial value. Moreover, a password used to identify the slave set is encrypted by the public key encryption system and the master set and the slave set send/receive the password.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication for transmitting and receiving information while enhancing confidentiality and preventing information from leaking to outside in radio communication between a master and one or more slaves. It belongs to the technical field of communication methods and wireless communication systems.

[0002]

2. Description of the Related Art In recent years, a so-called wireless LAN (Local Area Network) has been developed.
Network) is becoming widespread, and a so-called spread-spectrum communication system has recently become popular as one of the communication modulation systems used for this wireless LAN. This spread spectrum communication system is a communication system in which the energy of a signal to be transmitted and received is spread over a wider frequency range than the original frequency of the signal and transmitted, and has advantages such as being able to suppress the power density. is there.

[0003] A frequency hopping system is becoming popular as one of the spread spectrum communication systems. This method is a method of transmitting information while changing the frequency with time, and has the advantage that the power density can be suppressed to the lowest when considered in a time sufficiently longer than the hopping cycle, and the transmitted frequency changes every moment, It has the advantage of high resistance to interference and eavesdropping.

In the radio communication using the frequency hopping method, a so-called hop table indicating a changing frequency is used in order to synchronize the hopping frequency in both a transmitting radio station transmitting information and a receiving radio station receiving information. Are held in common by both sides, and information is exchanged between the transmitting radio station and the receiving radio station while changing the transmission frequency and the reception frequency in accordance with the hop table.

[0005] At this time, when the reception non-selection station is added to the transmission non-selection station, when mutually exchanging information using the frequency hopping method, the above-mentioned hop table is stored in advance from the transmission non-selection station. It is necessary to transmit to a receiving unselected station and start transmitting and receiving information using the transmitted hop table in the receiving unselected station.

On the other hand, for example, when information is exchanged between a specific receiving radio station and a transmitting radio station set in advance, a specific so-called password is transmitted from the receiving radio station to the transmitting radio station in advance. In general, the transmitting wireless station acquires the password, decodes the password, determines that the receiving wireless station is the specific receiving wireless station, and starts transmitting information to the receiving wireless station.

[0007]

However, if the hop table is intercepted during the transmission of the hop table from the parent device before the transmission / reception of information, the hop table can be obtained by a third party. However, there has been a problem that the confidentiality of information in the frequency hopping scheme may be significantly reduced.

Further, if the password is intercepted when the password is transmitted from the receiving wireless station to the transmitting wireless station, the password can be obtained by a third party,
As a result, a radio station other than the specific receiving radio station can receive information as if it were a specific receiving radio station. In this case, the confidentiality of information to be transmitted and received is significantly reduced. Becomes

In order to avoid these problems, it is conceivable to encrypt the information to be transmitted and received between the transmitting radio station and the receiving radio station other than the hop table or the password. In addition, a large-scale operation is required for information encryption and decryption, and the circuit configuration for the operation is complicated. In addition, if simple encryption is used to reduce the operation scale, confidentiality may decrease. The problem arises.

Therefore, the present invention has been made in view of the above-mentioned problems, and the problem is that a transmitting radio station (hereinafter referred to as a base unit) which is connected to an external line such as a telephone line and used exclusively and fixed. ) And a specific, for example, mobile receiving radio station (hereinafter, referred to as a slave), a radio communication method and a radio communication system capable of improving confidentiality of information to be transmitted and received. It is in.

[0011]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, transmission and reception of information between a parent device and a child device or between the child devices is performed by the information transmission and reception method. Is a wireless communication method for performing wirelessly while concealing and decrypting using concealed information such as a hop table, wherein the concealed information from the master unit is received by the slave unit. When transmitting the concealment information for releasing and decrypting the concealment from the master unit to the slave unit that does not have the concealment information, the encryption key information for encrypting the concealment information is transmitted. Transmitting an encryption key information transmitted from the slave unit to the master unit, and encrypting the concealment information based on the received encryption key information in the master unit to generate encrypted concealment information An encryption step and the generated encrypted concealment Information from the master unit to the slave unit, and, in the slave unit, the decryption information transmitted from the master unit to the decryption information transmitted from the master unit. And a restoring step of restoring the confidential information using the decryption method.

According to the operation of the first aspect of the present invention, in the encryption key information transmitting step, when the confidential information is transmitted from the master unit to the slave unit having no concealment information, the concealment information is transmitted. Is transmitted from the slave unit to the master unit.

Next, in the encryption step, the concealment information is encrypted based on the encryption key information received by the master unit to generate encrypted concealment information.

Then, in the concealment information transmitting step, the generated encrypted concealment information is transmitted from the master unit to the slave unit.

Next, in the restoration step, the transmitted encrypted concealment information is decrypted by the slave unit using the decryption key information corresponding to the encryption key information, and the concealment information is restored.

Therefore, the confidential information for concealing the information to be transmitted / received is encrypted and transmitted from the master unit to the slave unit.
Since information is obtained while concealment is released using the concealed information restored in the child device, information on transfer between the parent device and the child device or between child devices is compared with the case where only the information itself is concealed. Confidentiality is improved.

Further, even when a new handset having no concealment information is newly added to start information transfer, the concealment information for transfer is encrypted and transmitted to the handset. Does not leak to the outside, and the confidentiality in information transfer is improved.

[0018] In order to solve the above-mentioned problem, the invention according to claim 2 is a method for determining whether or not a child device is a preset child device between the parent device and the child device. Wireless communication for transmitting and receiving identification information such as a password for identifying the wireless communication while keeping the identification information confidential, and wirelessly transmitting and receiving information between the master unit and the setting slave unit. A method, comprising: transmitting encryption key information for encrypting the identification information from the master unit to the slave unit; and in the slave unit, based on the received encryption key information. Encrypting the identification information to generate encrypted identification information, an identification information transmission step of transmitting the generated encrypted identification information from the slave unit to the master unit, and in the master unit, The transmitted encrypted identification information is Decrypting using the previously set decryption key information corresponding to the key information, and restoring the identification information, and, in the master unit, the encrypted identification information based on the restored identification information. A determining step of determining whether the transmitted slave unit is the setting slave unit; and determining that the slave unit that transmitted the encrypted identification information is the setting slave unit, A transmitting step of transmitting the information to the setting slave unit from the above.

According to the second aspect of the invention, in the encryption key information transmission step, the encryption key information is transmitted from the master unit to the slave unit.

Then, in the encryption step, the identification information is encrypted by the slave unit based on the received encryption key information, thereby generating encrypted identification information.

Next, in the identification information transmitting step, the generated encrypted identification information is transmitted from the slave unit to the master unit.

Thereafter, in the restoration step, the transmitted encrypted identification information is decrypted by the master unit using the decryption key information, and the identification information is restored.

In the determining step, based on the restored identification information, the master determines whether or not the slave that has transmitted the encrypted identification information is the set slave.

Finally, in the transmitting step, when it is determined that the slave unit that has transmitted the encrypted identification information is the set slave unit, the information is transmitted from the master unit to the set slave unit.

[0025] Therefore, it is possible to surely identify the set slave unit and transmit and receive the information without the identification information being known to the outside.

According to a third aspect of the present invention, there is provided an apparatus for transmitting and receiving information between a parent device and a child device or between the child devices, and concealing the information using a hop table or the like. A wireless communication system that performs wireless communication while performing concealment and decryption using encrypted information, wherein the encryption key information transmission means included in the slave unit, wherein the concealed information from the master unit is When transmitting the confidential information for receiving and decrypting the concealment and decrypting the received information at the child device from the parent device to the child device having no concealment information, the concealment information is encrypted. Encryption key information transmitting means, such as a transmission / reception unit, for transmitting encryption key information to the master device for encrypting the concealment information based on the received encryption key information while being included in the master device. Encryptor that generates encrypted concealed information The encryption means, and included in the master unit, concealment information transmission means such as a transmission and reception unit that transmits the generated encrypted concealment information to the slave unit, and included in the slave unit, A decryption unit that decrypts the transmitted encrypted confidential information using preset decryption key information corresponding to the encryption key information, and recovers the confidential information.

According to the operation of the third aspect, the encryption key information transmitting means included in the slave unit transmits the concealment information from the master unit to the slave unit not having the concealment information. Then, the encryption key information for encrypting the concealment information is transmitted to the master unit.

Then, the encryption means included in the master unit encrypts the concealment information based on the received encryption key information, and generates encrypted concealment information.

Then, the concealment information transmitting means included in the master unit transmits the generated encrypted concealment information to the slave unit.

Finally, the restoring means included in the slave unit decrypts the transmitted encrypted confidential information using the decryption key information to restore the confidential information.

Therefore, the concealment information for concealing the information to be transmitted / received is encrypted and transmitted from the master unit to the slave unit.
Since information is obtained while concealment is released using the concealed information restored in the child device, information on transfer between the parent device and the child device or between child devices is compared with the case where only the information itself is concealed. Confidentiality is improved.

Further, even when a new handset having no concealment information is newly added to start the transmission / reception of information, the concealment information for transmission / reception is encrypted and transmitted to the handset. Does not leak to the outside, and the confidentiality in information transfer is improved.

According to a fourth aspect of the present invention, in the wireless communication system according to the third aspect, the concealment of the information is performed by changing a frequency used for transmission and reception of the information. And the concealment information is configured to be table information that is referred to when the frequency is changed.

According to the operation of the invention described in claim 4, in addition to the operation of the invention described in claim 3, concealment of information is performed by:
Since the frequency used for transmitting and receiving the information is changed over time, and the concealment information is table information that is referred to when the frequency is changed, the transmission and reception of the table information is performed in a concealed manner, so that eavesdropping etc. Can be kept more effectively confidential.

According to a fifth aspect of the present invention, in the wireless communication system according to the third or fourth aspect, the encryption key information is a public key in a public key encryption system. The decryption key information is configured to be a secret key in the public key cryptosystem.

According to the operation of the invention described in claim 5, in addition to the operation of the invention described in claim 3, the encryption key information is a public key in a public key encryption system, and the decryption key information is Since it is a secret key in a public key cryptosystem, the confidentiality of information can be further improved.

According to a sixth aspect of the present invention, in the wireless communication system according to the fourth or fifth aspect, the concealment information is stored in a table referred to when the frequency is changed. The slave unit further includes a generation unit such as a hop table generator for generating the table information using the generation information as well as the generation information such as an initial value for generating the information.

According to the operation of the invention described in claim 6, in addition to the operation of the invention described in claim 4 or 5, the concealment information is used for generating table information referred to when changing the frequency. The information processing apparatus further includes a generation unit that generates the table information using the generated information as well as the generated information.

Therefore, it is possible to obtain the table information in the slave unit and decode the transmitted information more quickly than in the case where the table information itself is encrypted as confidential information and transmitted from the master unit to the slave unit. Can be.

In order to solve the above-mentioned problem, an invention according to claim 7 is a method for determining whether or not a child device between a parent device and a child device is a preset child device set in advance in the parent device. Wireless communication for transmitting and receiving identification information such as a password for identifying the wireless communication while keeping the identification information confidential, and wirelessly transmitting and receiving information between the master unit and the setting slave unit. An encryption key information transmitting unit included in the master unit, the encryption key information transmitting unit including a transmission / reception unit that transmits encryption key information for encrypting the identification information to the slave unit. Included in the slave unit, encrypting the identification information based on the received encryption key information, encrypting means such as an encryptor for generating encrypted identification information, and included in the slave unit, The generated encrypted identification information is transmitted to the master unit. Identification information transmitting means such as a transmitting and receiving unit for transmitting, and included in the master unit, decrypts the transmitted encrypted identification information using preset decryption key information corresponding to the encryption key information, Restoring means such as a decoder for restoring identification information, included in the master unit,
Determining means such as a controller for determining whether or not the slave unit that transmitted the encrypted identification information is the set slave unit based on the restored identification information; Transmission means such as a transmission / reception unit for transmitting the information to the set slave unit when it is determined that the slave unit that has transmitted the identification information is the set slave unit.

According to the operation of the present invention, the encryption key information transmitting means included in the master unit transmits the encryption key information to the slave unit.

Then, the encryption means included in the slave unit encrypts the identification information based on the received encryption key information, and generates encrypted identification information.

Thereafter, the identification information transmitting means included in the slave unit transmits the generated encrypted identification information to the master unit.

Next, the restoring means included in the master unit decodes the transmitted encrypted identification information using the decryption key information to restore the identification information.

The determining means included in the master unit determines whether or not the slave unit that has transmitted the encrypted identification information is the set slave unit based on the restored identification information.

Lastly, the transmitting means included in the master unit transmits information to the set slave unit when it is determined that the slave unit that transmitted the encrypted identification information is the set slave unit.

Therefore, the identification information is not known to the outside, and information can be transmitted and received by reliably identifying the set slave unit.

In order to solve the above-mentioned problem, the invention according to claim 8 is the wireless communication system according to claim 7, wherein the encryption key information is a public key in a public key encryption system, and The decryption key information is configured to be a secret key in the public key cryptosystem.

According to the operation of the invention described in claim 8, in addition to the effect of the invention described in claim 7, the encryption key information is a public key in a public key encryption system, and the decryption key information is a public key. Since it is a secret key in a cryptographic system, the confidentiality of information can be further improved.

[0050]

Next, a preferred embodiment of the present invention will be described with reference to the drawings.

(I) First Embodiment First, a first embodiment according to the present invention will be described with reference to FIGS. Here, the first described below
The embodiment is formed in advance by a master unit and one or more slave units, and transmits / receives information by the frequency hopping system by adding a new slave unit to a wireless communication system using a frequency hopping method. This is an embodiment to which the present invention is applied when starting.

First, an overall configuration and a schematic operation of the master unit constituting the wireless communication system of the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the master unit SO generates information to be transmitted and the like and processes the received information, and transmits the information to be transmitted to the slave unit via the antenna ANT. In addition, the transmission / reception unit 1 as confidential information transmission means for receiving information transmitted from the child device via the antenna ANT and outputting the information to the main unit 10.

The transmission / reception unit 1 includes an interface 2, a modulation / demodulation unit 3, an up-converter 4, a power amplifier 5, a transmission / reception switch 6, and a low noise amplifier 7.
, Down converter 8 and PLL (Phase Locked Loo
p) 9 and the antenna ANT.

The main unit 10 also has a random access memory (RAM) for temporarily storing information to be exchanged with the slave unit.
Memory) 11, a hop table storage unit 11A provided in the RAM 11 and storing information included in the hop table, an encryptor 12 as an encryption unit for encrypting the hop table in a process to be described later, and an encryptor A switch 13 for switching between the output of the master unit 12 and the information to be exchanged and outputting the information to the transmission / reception unit 1, a controller 14 for controlling the entire master unit SO, and a controller 14 for each component of the master unit SO. Power supply unit 15 that supplies power supply voltage
It is composed of

Next, the overall configuration and general operation of the slave unit constituting the wireless communication system of the present embodiment will be described with reference to FIG.

As shown in FIG. 2, slave unit SC generates information to be transmitted and the like and processes received information, and transmits information to be transmitted to master unit SO via antenna ANT. At the same time, the information transmitted from the master unit SO is received via the antenna ANT, and the main unit 30
And a transmission / reception unit 20 as encryption key information transmission means for outputting the information to the user.

The transmitting / receiving unit 20 includes an interface 21, a modem unit 22, an up-converter 23,
Power amplifier 24, transmission / reception switch 25, low noise amplifier 26, down converter 27, PLL
(Phase Locked Loop) 28 and the antenna ANT.

The main unit 30 is provided with a RAM 31 for temporarily storing information to be exchanged with the master unit, and the like.
M31, a hop table storage unit 31A for storing information included in the hop table, a decoder 32 as a restoration unit for restoring a hop table transmitted in a process described later, and an output of the decoder 32. A changeover switch 33 for switching the information to be exchanged and outputting the information to the transmission / reception unit 20, a controller 34 for controlling the whole handset SC, and supplying a power supply voltage to each component of the handset SC via the controller 34 And a power supply unit 35.

Next, detailed operations of the master unit SO and the slave unit SC will be described with reference to FIGS.

First, transmission and reception of general information in the wireless communication system of the present embodiment (hop tables are acquired in the parent device SO and the child device SC, and information transmission and reception performed by the frequency hopping method based on the hop tables are performed). 1) will be described with reference to FIGS.

First, information is transmitted from the master unit SO and the slave unit S
The processing when C receives this will be described.

When information is transmitted from parent device SO to child device SC, as shown in FIG.
, The information of the hop table stored in the hop table storage unit 11A in the RAM 11 is output to the PLL 9 as a table signal Stt. Based on the table signal Stt, a local signal Sc having a frequency set in the hop table is generated, frequency locked, and output to the up converter 4. On the other hand, the information to be transmitted is temporarily stored in the RAM 11.
After being stored in the switch 13 as the information signal Sif
Is output to At this time, the changeover switch 13 is switched to the information signal Sif side based on a control signal Ssw ₁ from the controller 14.

When the information signal Sif is output to the transmission / reception unit 1 via the changeover switch 13, the interface 2 performs a fetch operation (interface operation) to the transmission / reception unit 1 in accordance with the attribute of the information signal Sif. Then, the signal is subjected to predetermined modulation in the modulator / demodulator 3, output as a modulation signal Smi, and output to the up-converter 4.

As a result, in the up-converter 4 constituted by a mixer or the like, the frequency of the modulation signal Smi and the frequency of the local signal Sc are added, and the sum is output to the power amplifier 5 as a transmission signal St and is output at a predetermined amplification factor. Amplified. Thereafter, the transmission signal St is transmitted to the antenna ANT slave unit SC via the duplexer switch 6 (is switched to the transmission signal St side based on a control signal Ssw ₂ from the controller 14.). By the operation of the up-converter 4, the frequency at which the transmission signal St is transmitted changes corresponding to time so as to include the frequency set as the hop table.

Next, the receiving operation in the slave unit will be described with reference to FIG.
This will be described with reference to FIG.

Information including the transmission signal St transmitted from the parent device SO while changing the frequency is received by the antenna ANT of the child device SC, and transmitted and received by the transmission / reception switch 2.
5, and is amplified by the low noise amplifier 26 at a predetermined amplification factor as a reception signal Sr. At this time, the transmission / reception changeover switch 25 operates the control signal Ssw from the controller 34.
₂ is switched to the low noise amplifier 26 side. Then, the received signal Sr amplified by the low noise amplifier is output to the down converter 27.

On the other hand, when the information from the master unit SO is received by the slave unit SC, the hop table (having the same contents as the hop table of the master unit SO) stored in the hop table storage unit 31A in the RAM 31 is used. Is output to the PLL 28 as a table signal Stt, and the PLL 28 refers to the table signal Stt based on the control signal Spl from the controller 34, and outputs a local signal of the frequency set in the hop table. Sc is output to the down converter 27.

Thus, in the down converter 27 constituted by a mixer or the like, the reception signal Sr
The frequency of the local signal Sc is subtracted from the frequency of
A demodulated signal S which is a signal similar to the modulated signal Smi in O
ni and output to the modem 22
, A demodulation operation is performed and output to the main unit 30 via the interface 21.

After that, the demodulated signal is output as an information signal Sif via the changeover switch 33 in the main body 30 and is temporarily stored in the RAM 31. At this time,
Changeover switch 33 is switched to the information signal Sif side based on a control signal Ssw ₁ from the controller 34.

Thereafter, a predetermined process or the like is performed on the stored information by a processing unit (not shown).

Here, the structure of information transmitted and received between the parent device SO and the child device SC in the present embodiment will be described with reference to FIG.

In the wireless communication system of the present embodiment, bidirectional communication is performed using a so-called TDD (Time Division Duplex) method. That is, for example, when information is transmitted from the parent device SO to the child device SC, the parent device SO
As shown in (a), frequency hop phase block 1
6A, a transmission phase block 16B, a transmission / reception switching phase block 16C, and a reception phase block 16D.
On the other hand, as shown in FIG. 3A, the slave unit SC includes a frequency hop phase block 17A, a reception phase block 1
7B, and operates by configuring information in units of a frame 17 including a transmission / reception switching phase block 17C and a transmission phase block 17D. At this time, the timing from the start to the end of each phase block in each frame is set and managed in advance. In addition, the frequency hopping (switching) is performed for each frame, and the frequency does not change when information forming one frame is transmitted and received.

Among these phase blocks, the frequency hop phase blocks 16A and 17A are used for stabilizing the transmission / reception frequency which is in a transition state with the switching of the frame. Not performed.

Transmission phase block 1 of master SO
6B (ie, the reception phase block 17 of the slave unit SC)
In B), during a period in which information is transmitted from the master unit SO to the slave unit SC, the information includes, in addition to the transmission signal St, a synchronization signal for each frame between the master unit SO and the slave unit SC as a control signal. Signal, a call signal for calling the slave unit SC, a connection permission signal indicating that the call from the slave unit SC has been accepted, a busy signal indicating that the master unit SO is communicating, and the like. Have been.

Further, the transmission / reception switching phase block 16C or 17C is a transition period in which transmission and reception are switched in the master unit SO and the slave unit SC, respectively.
No information is transmitted and received between Cs.

Finally, the reception phase block 16D of the master unit SO (ie, the transmission phase block 17 of the slave unit SC)
D) is a period during which information is transmitted from the child device SC to the parent device SO by an operation described later. The information includes a transmission signal St in the child device SC described later and a control signal as a control signal.
A synchronization confirmation signal that replies that synchronization with the master unit SO has been achieved, a call signal that calls the master unit SO, a connection acknowledgment signal indicating that a call has been received from the master unit SO, and the slave unit SC are communicating. And a busy signal indicating the fact.

Transmission / reception is performed in one frame in units of a frame constituted by the above-described phase blocks, and the transmission / reception is repeatedly performed over a plurality of frames, so that bidirectional communication is performed between the master unit SO and the slave unit SC. Is executed. Also, each of the above frames,
It is configured based on a control signal Sm from each controller in the parent device SO and the child device SC.

Next, information is transmitted from slave unit SC, and
The processing when this is received at O will be described.

The operation when information is transmitted from child device SC to parent device SO is basically the same as that for transmitting information from parent device SO to child device SC. This is equivalent to the processing when the slave unit SC is replaced.

That is, the information stored in the RAM 11 of the slave unit SC is used as the information signal Sif as the changeover switch 3
3. The modulated signal Smi is output to the up-converter 23 via the interface 21 and the modem 22.
Then, in the up-converter 23, the PLL 28
, The frequency of the local signal Sc corresponding to the frequency information in the hop table is added and amplified by the power amplifier 24, and transmitted to the antenna AN via the transmission / reception switch 25.
Sent from T. At this time, the frequency for transmission / reception changes for each frame.

The signal received by the antenna ANT of the master unit SO is amplified by the low-noise amplifier 7 via the transmission / reception switch 6 as a reception signal Sr.
In the down-converter 8, the frequency of the local signal Sc is subtracted from the frequency of the received signal Sr to become a demodulated signal Sni, which is demodulated in the modem 3 and sent to the main unit 10 via the interface 2 and the changeover switch 13 Via the RAM 11.

By the operation of each unit described above, two-way communication of information is performed between the master unit SO and the slave unit SC using the frequency hopping method.

Next, a hop table used in the frequency hopping method will be described with reference to FIG. 3B. FIG. 3B shows a state in which four types of tables (tables f to k each including N types of frequencies) are stored in the hop table storage unit 11A of the master unit SO as hop tables.

At this time, for example, the N kinds of frequencies described in the table f are used for paging control or for changing the frequency at the time of transmission from the master unit SO of the hop table itself to the slave unit SC described later. The N kinds of frequencies described in the tables g to k respectively store information to be concealed in the base unit SO.
Is used to change the frequency when the data is actually transmitted to the slave unit SC (at the time of information communication). At this time, the frequencies included in one table are used for communication with one child device SC. That is, in the case shown in FIG. 3B, three slaves SC are wirelessly connected to one master SO, and one of the tables g to k is connected to one slave SC. It becomes possible to transmit and receive information by allocating.

Next, according to the present invention, the above-described hop table for wirelessly connecting the child device SC to the parent device SO is stored in the parent device S.
Processing for transmitting data from O to the slave unit SC will be described with reference to the flowcharts shown in FIGS. 1 and 2 and FIGS. 4 and 5. The flowchart shown in FIG.
5 shows the processing in O, and the flowchart shown in FIG. 5 shows the processing in the slave unit SC, and mainly shows the processing in the controller 14 or 34.

First, the operation of the master unit SO will be described.
This will be described with reference to FIGS.

When transmitting a hop table for information communication (for example, any one of tables g to k in FIG. 3B) from master unit SO to new slave unit SC, First, wait for reception (step S
1) It is determined whether or not a call has been made from the child device SC to be newly connected to the parent device SO that is performing the connection (step S2), and if there has been a call (step S2; YE).
S) ID information from the child device SC (information for specifying one child device SC, information included at the top of each frame. This ID information is transmitted and received without being encrypted. Is normal.) (Step S3).
The child device SC in which the child device SC is registered in advance based on the received ID information (ID information is a child device S that can be connected to the parent device SO (it is likely to be connected in the future).
It is registered in advance as ID information of C. ) Is determined (step S4).

On the other hand, if it is determined in step S2 that there is no call from the slave unit SC (step S2; NO), it is determined whether or not a predetermined time set in advance has elapsed (step S6). Time is (Step S6; N
O) The reception standby state (step S1) is continued, and when it has elapsed (step S6; YES), the main unit SO is put into the sleep state (step S15).

If it is determined in step S4 that the slave unit SC is not registered (step S4; NO),
Since it is not the slave SC that has been scheduled to be connected in advance, the communication with the slave SC is cut off (step S5), and the process returns to step S1 to wait for reception.

Further, if it is determined in step S4 that the slave unit SC is registered (step S4; YES).
Next, the transmission / reception unit 1 receives the public key signal Sko transmitted from the slave unit SC in the same manner as ordinary information (step S7), and transmits the public key information included in the received public key signal Sko. Hop table storage unit 11A
Any one of the hop tables for information communication stored in the device (a hop table to be used for wireless communication with the slave unit SC to be connected)
Is encrypted in the encryptor 12, and an encrypted table signal St a is output (step S).
8). Thereafter, the encryption table signal Sta is transmitted to the slave unit SC via the transmission / reception unit 1 (step S9). At this time, the changeover switch 13 has been switched to the encryptor 12 side. In addition, for the frequency hopping when transmitting the encryption table signal Sta to the slave unit SC, a table f shown in FIG. 3B (only this table is provided in advance by all the slave units SC) is used. It is transmitted while the frequency is changed.
Further, in the encryption in step S8, for example, RSA (Rivest-Shamir-
Adleman) Encryption, ElGamal encryption, Elliptic curve encryption, Ellipse R
Encryption is performed using an encryption method such as SA encryption or reciprocal encryption.

Here, the public key is used in a so-called public key cryptosystem, and in the present embodiment, the child device SC from which the hop table for wireless communication is to be obtained is transmitted to the parent device SO. A public key signal Sko corresponding to the public key is transmitted, and the master SO that has received the public key signal encrypts the hop table for wireless communication using the public key,
The encrypted hop table is transmitted to the slave unit SC.
Then, the slave unit SC that has received this decrypts the cipher using the secret key (which is different from the public key itself) corresponding to the public key and obtains a hop table. .

After transmitting the encryption table signal Sta, it is checked whether or not there is a request for retransmission of an encryption table signal Sta described later from the slave unit SC (step S10). Is retransmitted (step S10; YES) (step S9), and when there is no retransmission request (step S10).
10; NO), next, it is confirmed whether or not a later-described reception completion signal has been received from the slave unit SC (step S11). If it has not been received (step S11; NO), the process stands by until it is received.

On the other hand, when the reception completion signal is received (step S11; YES), the hop table for wireless communication is transmitted from the table f which has been used so far (encrypted and transmitted (step S9)). Hop table) (step S12), and a specific communication by the frequency hopping method is started with the slave unit SC which has transmitted the wireless communication hop table (step S9) (step S13).

Then, it is determined whether or not the communication has been completed (step S14). If the communication has not been completed (step S1).
4; NO) Communication is continued as it is (step S13),
When the processing has been completed (step S14; YES), the processing shifts to the sleep state (step S15). And the master SO
Is determined (step S1).
6) If the processing is terminated (step S16; YES), the processing is terminated as it is, and if the processing is not terminated (step S16).
16; NO) Continue the sleep state (step S1)
5).

Next, the hop table acquisition operation of the slave unit SC corresponding to the operation of the master unit SO will be described with reference to FIGS.
This will be described with reference to FIG.

In response to the operation of the master unit SO, the slave unit SC to be newly connected first transmits the ID information (see step S3 in FIG. 4) (step S2).
0) Next, the public key signal Sko corresponding to the public key stored in the RAM 11 of
(Step S21). In the transmission of the public key signal Sko, frequency hopping using the table f is performed.

Next, a transmission is made from master SO in response to transmitted public key signal Sko (see step S9 in FIG. 4).
The encryption table signal Sta is received (step S2).
2). Then, it is determined whether or not the reception was successful (step S23). If the reception was not possible (step S23; YES), a retransmission request is made to the master unit SO (step S24; see step S10 in FIG. 4). S2
2 and receives the retransmitted encryption table signal Sta.

On the other hand, if the encryption table signal Sta has been received without error (step S23; NO), then R
Using the secret key signal Ssc corresponding to the secret key stored in the AM 31, the received encryption table signal Sta is restored as the original hop table in the decoder 32 (step S25). Then, the encryption table signal Sta
Is transmitted to the master unit SO indicating that the reception has been completed (step S26; see step S11 in FIG. 4),
Next, the table f that used the hop table until then
Is switched to the wireless communication hop table restored from (step S27), and specific communication by the frequency hopping method with the master SO is started (step S27).
28).

Then, it is determined whether or not the communication has been completed (step S29). If the communication has not been completed (step S2).
9; NO) Communication is continued as it is (step S28),
When the processing has been completed (step S29; YES), the processing shifts to the sleep state (step S30). And child unit SC
It is determined whether or not the power supply has been turned off (step S3).
1) When the processing is terminated (step S31; YES), the processing is terminated as it is, and when the processing is not terminated (step S31).
31; NO) Continue the sleep state (step S3)
0).

According to the operation of the wireless communication system of the first embodiment described above, the hop table for concealing the information to be transmitted / received is encrypted, and the master SO and the slave S are encrypted.
C, and the information is received using the hop table restored in the slave unit SC. Therefore, the information in the exchange between the master unit SO and the slave unit SC is smaller than in the case where only the information itself is concealed by the frequency hopping method. Confidentiality is improved.

Further, even when a new handset SC having no hop table is newly added to start information transfer, the hop table for transfer is encrypted and transmitted to the handset SC. There is no leakage to the outside, and confidentiality in information transfer is improved.

Further, by concealing the transmission and reception of the hop table in the frequency hopping method, the information can be concealed more effectively against eavesdropping and the like.

Since the hop table is transmitted using the public key cryptosystem, the confidentiality of information can be further improved.

If the slave SC obtains the hop table by the above-described method, the hop table does not leak to the outside. Therefore, when a plurality of slaves SC are connected to the master, The confidentiality of information exchange between the slave units SC is also improved.

In the above embodiment, the public key signal Sko and the encryption table signal Sta are obtained via each interface. However, the present invention is not limited to this. You may.

(II) Second Embodiment Next, a second embodiment which is another embodiment of the present invention will be described with reference to FIGS. Here, FIG. 6 is a diagram illustrating a configuration of a parent device SO ′ according to the second embodiment, and FIG. 7 is a diagram illustrating a configuration of a child device SC ′ according to the second embodiment.

In the first embodiment, the slave unit SC
In the second embodiment, the hop table itself is encrypted by the master SO using the public key from the client, and the hop table itself is transmitted to the slave SC to be restored and the hop table is acquired. Only the initial value for generation is encrypted in the parent device SO using the public key from the child device SC and transmitted to the child device SC, and the hop table is encrypted using the initial value encrypted in the child device SC. Generate.

In FIGS. 6 and 7, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the detailed description is omitted.

First, the configuration of a master unit SO 'according to the second embodiment will be described with reference to FIG.

As shown in FIG. 6, a master unit SO ′ according to the second embodiment is provided with an initial value storage unit for storing an initial value used when generating a hop table, instead of the RAM 11 in the first embodiment. A RAM 40 having a 40A is provided, and a hop table generator 41 for generating a hop table for wireless communication using the initial value is provided. The other configuration is the same as that of the master unit SO.

Next, the configuration of the child device SC 'according to the second embodiment will be described with reference to FIG.

As shown in FIG. 7, the slave unit SC 'according to the second embodiment includes a RAM 50 having an initial value storage unit 50A for storing the initial values, instead of the RAM 31 in the first embodiment. And a hop table generator 51 as generating means for generating a hop table for wireless communication using the initial values. Other configurations are the same as those of the slave unit SC.

Next, the operation of the second embodiment in the wireless communication system constituted by the master unit SO 'and the slave unit SC' having the above configuration will be described.

When connecting a new slave unit SC ′ in the second embodiment, first, the slave unit SC ′ is connected to the new slave unit SC ′.
Transmits a public key signal Sko corresponding to the public key.

In the master SO 'receiving this, a hop table to be used for wireless communication with the slave SC' to be connected is generated by using the public key. The initial value signal Si corresponding to the encrypted initial value signal Sia is encrypted in the encryptor 12, and the encrypted initial value signal Sia is output.
ia is transmitted to the slave unit SC ′ via the transmission / reception unit 1.

On the other hand, in the slave unit SC 'which has received the encrypted initial value signal Sia, the main unit 30' obtains the encrypted initial value signal Sia via the transmission / reception unit 20, and sends it to the secret key signal Ssc. And restores the original initial value signal Si in the decoder 32 using the initial value storage unit 5 in the RAM 50.
Store at 0A.

Next, at the time of transmission of information to be transmitted / received, the hop table generator 41 generates a hop table using the previously stored initial value in the master unit SO ', and the corresponding table The signal Stt is output to the PLL 9 to exchange information while performing frequency hopping.

On the other hand, in slave unit SC ', master unit SO'
From the initial value storage unit 50A, generates a hop table in the hop table generator 51, and converts the corresponding table signal Stt into a PLL.
28 to transmit and receive information while performing frequency hopping.

According to the operation of the wireless communication system of the second embodiment described above, only the initial value is encrypted and transmitted.
By receiving and decoding this, the slave unit SC ′ obtains the hop table more quickly and decrypts the transmitted information as compared with the case where the hop table itself is encrypted and transmitted from the master unit to the slave unit. can do.

Note that the hop table generators 41 and 51 are controlled by the controller 1 using software.
The functions of the hop table generators 41 and 51 may be achieved by the function of the hop table generators 4 and 34. In addition, it is possible to use a shift register having a predetermined feedback tap.

(III) Third Embodiment Next, a third embodiment which is another embodiment according to the present invention will be described with reference to FIGS. here,
FIG. 8 is a diagram illustrating a configuration of a parent device SO ″ according to the third embodiment, and FIG. 9 is a diagram illustrating a configuration of a child device SC ″ according to the third embodiment. FIG. 10 is a flowchart illustrating the operation of the master unit SO ″ in the third embodiment, and FIG. 11 is a flowchart illustrating the operation of the slave unit SC ″ in the third embodiment.

In the first or second embodiment,
The embodiment of the wireless communication system that conceals the acquisition of the hop table for the frequency hopping scheme has been described. In the third embodiment, the slave unit to be connected to the master unit SO ″ is set and registered in advance. This is an embodiment of a wireless communication system for concealing the transmission and reception of a so-called password for determining whether or not the mobile device SC "is a child device.

In FIGS. 6 and 7, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and the detailed description is omitted.

First, the configuration of a master unit SO ″ according to the third embodiment will be described with reference to FIG.

As shown in FIG. 8, the parent machine SO ″ according to the third embodiment temporarily stores information to be transmitted and received and stores a password, instead of the main body 10 in the first embodiment. RAM with password storage unit 60A
60, a decryptor 61 for restoring a password based on an encrypted password signal Stw to be described later, and a main unit 1 including the controller 14 and the power supply unit 15 as determination means.
0 ". Other configurations are basically the same as those of the base unit S.
Same as O.

Next, the configuration of the slave unit SC ″ according to the third embodiment will be described with reference to FIG.

As shown in FIG. 9, the child device SC "according to the third embodiment temporarily stores information to be transmitted and received and stores a password, instead of the main unit 30 in the first embodiment. RAM with password storage unit 70A
70, an encryptor 71 for generating an encrypted password signal Stw, which will be described later, and a main unit 30 "including the controller 34 and the power supply unit 35. Other configurations are basically the same as those of the slave SC. The same is true.

Next, a description will be given of a password transmission operation of the third embodiment in the wireless communication system constituted by the master unit SO ″ and the slave unit SC ″ having the above configuration, with reference to FIG. 10 and FIG. The flowchart shown in FIG. 10 and the flowchart shown in FIG. 11 mainly show processing in the controller 14 or 34.

First, the operation of the master unit SO ″ will be described with reference to FIGS. 8 and 10.

When the parent device SO "determines whether or not the connected child device is the child device SC" which has been set and registered in advance, first, it synchronizes with the connected child device. A public key signal Sko corresponding to the signal and the public key is transmitted (step S40). In this case, the public key signal Sko corresponding to the public key stored in the RAM 60 in advance is transmitted via the transmission / reception unit 1 as a transmission unit.
At this time, transmission may be performed by the frequency hopping method using the table f (see FIG. 3B).

After transmitting the public key signal Sko, the process shifts to a reception standby state (step S41), and it is determined whether or not there is a call from the connected slave unit (step S41).
42). If there is no call (step S42; N
O) Then, it is determined whether or not a predetermined time that has been set in advance has elapsed (step S43). If not (step S43; NO), the reception standby state is continued (step S41). When the predetermined time has elapsed (step S43; YES), the processing shifts to the sleep state (step S44). Then, it is determined whether or not a predetermined time set in the sleep state has elapsed (Step S).
45) When it has not elapsed (step S45; NO)
The sleep state is continued (step S44). When the sleep state has elapsed (step S45; YES), it is then determined whether or not the power of the master unit SO "is turned off (step S4).
6) When it is disconnected (step S46; YES)
The process is terminated as it is, and when it is not determined (step S46; NO), the process returns to step S40 to transmit the public key signal Sko and the like again. By the processing of steps S43 to S46, the synchronization signal and the public key signal Sko are repeatedly transmitted at predetermined time intervals during the reception standby.

On the other hand, if it is determined in step S42 that there is a call from the connected slave unit (step S42).
42; YES), obtains the ID information from the slave unit (step S47), and further obtains an encrypted password signal Stw described later transmitted from the slave unit via the transmission / reception unit 1 (step S48). Then, the decrypted encrypted password signal Stw is restored in the decoder 61 using the secret key signal Ssc corresponding to the secret key stored in the RAM 60 in advance, and the password signal Spw is obtained (step S49).

Next, the obtained password signal Spw is output to the controller 14, and the password signal Spw is registered in advance and indicates a password indicating the slave unit SC "(the password is not transmitted from outside by wireless transmission, but Master S
It is determined whether or not the password corresponds to O "itself (step S50). If the password does not correspond to the password indicating the slave unit SC" (step S50) S50; NO), and disconnects the communication connected as not being the slave SC "to be connected (step S51) and returns to step S40.

On the other hand, when the password corresponds to the password indicating the slave SC "(step S50; YES), it is determined that the connected slave is the slave SC" and the connection is permitted. SC ”(step S5).
2) Then, specific communication with the slave unit SC "is started (step S53). At this time, the hop table for wireless communication (the master unit SO" and the slave unit SC "are provided in advance). The communication may be performed by the frequency hopping method using

Then, it is determined whether or not a predetermined time set in advance has elapsed during the communication continuation (step S5).
4) If it has not elapsed (step S54; NO),
Next, it is determined whether or not the communication itself has ended (Step S).
55), when it is completed (step S55; YE)
S), the process returns to step S40 to perform the next communication, and when the communication is not completed (step S55; NO), the process is continued as it is (step S53).

On the other hand, if it is determined in step S54 that the predetermined time has elapsed (step S54; YES), a request signal (including the above-mentioned public key signal Sko) for transmitting the password again is issued to the slave unit SC. (Step S
56) Return to step S47. By the operations in steps S54 and S56, the password confirmation is repeated at predetermined time intervals during the communication continuation.

Next, a password transmission operation in slave unit SC "corresponding to the operation of master unit SO" will be described with reference to FIG. 9 and FIG.

In response to the operation of the master unit SO ", the slave unit SC" to which the password is to be transmitted is first transmitted from the master unit SO "(see step S40 in FIG. 10) and the synchronization signal and the disclosure are made. The key signal Sko is received by the transmission / reception unit 20 (step S60), the next received public key signal Sko is obtained by the main unit 30 ″, and is used by the encryptor 71 to store the password stored in the password storage unit 70A. The password signal Si corresponding to (the same password as that registered in the master unit SO ") is encrypted to generate an encrypted password signal Stw (step S61). Or, as in the second embodiment, for example, RSA encryption, ElGamal encryption,
Encryption is performed using an encryption method such as elliptic curve encryption, elliptical RSA encryption, or reciprocal encryption.

Next, a calling signal is transmitted to the parent device SO "(step S62; see step S42 in FIG. 10), and then the ID information of the child device SC" is transmitted (step S63, FIG. 10 step). See S47).

Subsequently, the encrypted password signal Stw is transmitted via the transmission / reception unit 20 (step S64; FIG. 10).
See step S48). At this time, the data may be transmitted by the frequency hopping method using the table f.

Next, upon receiving the connection permission signal from the master unit SO "(step S65, step S52 in FIG. 10).
(Refer to step S66; see step S53 in FIG. 10). At this time, communication is performed by the frequency hopping method using the hop table for wireless communication. Is also good.

Next, it is determined whether there has been a periodic password transmission request (see step S56 in FIG. 10) from master device SO "(step S67), and if so (step S67; YES), the above-mentioned steps are performed. S61 and S64
And the encrypted password signal Stw is changed to the parent device SO ".
And returns to step S66 to continue the communication.

On the other hand, if it is determined in step S67 that there is no password transmission request (step S67;
NO), it is then determined whether or not the communication has been completed (step S68), and if not, (step S68; N)
O) The communication is continued as it is (step S66), and when the communication is completed (step S68; YES), the state shifts to the sleep state (step S69). Then, it is determined whether or not the power of the slave unit SC "has been turned off (step S70). If the power has not been turned off (step S70; NO), the sleep state is continued as it is (step S69) and turned off. At this time (step S70; YES), the process ends.

According to the operation of the wireless communication system of the third embodiment described above, the password is encrypted and
O "and decrypts it, so that the password is not known to the outside, and the slave unit S to be securely connected is not transmitted.
C "can be identified to exchange information.

Further, since encryption is performed using the public key cryptosystem, the confidentiality of the transfer of the password and the subsequent information can be further improved.

In the third embodiment, the master unit S
O ”, a password transmission request signal for each fixed time (FIG. 1
If the public key included in step S56 is changed every time a request signal is issued, the confidentiality of the password is further improved.

Further, the master unit SO "receives the ID information from the slave unit SC" (see step S47 in FIG. 10).
Thereafter, for example, the random number is transmitted to the child device SC ", and the child device SC" that has received the random number encrypts the result of adding the random number to the password using the public key from the parent device SO "(see step S64 in FIG. 11). ) It may be configured to transmit to the master unit SO ″, to restore the master unit SO ″ with the secret key (see step S49 in FIG. 10), and to obtain a password by subtracting a random number. .
By doing so, the content of the encrypted password signal Stw transmitted from the child device SC "to the parent device SO" will be different each time, and the confidentiality of the password will be further improved.

In each of the above embodiments,
Although only the portion related to the transmission and reception of information has been described, the information to be transmitted and received by the wireless communication system of each embodiment may be, for example, facsimile information to be transmitted and received by facsimile, or voice information to be transmitted and received by telephone. There may be. Further, the information may be information to be exchanged between a computer and a printer (or a facsimile machine or the like). In this case, the master unit or the slave unit in each embodiment is mounted on a facsimile, a telephone, or a computer and a printer, respectively. The configuration of the interface in each embodiment includes a codec and a compressor for performing mutual conversion between voice and digital information when the master unit or the slave unit is provided in the telephone. Alternatively, when the information of a computer or the like is handled in the slave unit, the slave unit includes a buffer, a data converter for performing error correction processing, and the like.

Further, the transmission of the encryption table signal Sta, the encryption initial value signal Sia or the encryption password signal Stw in the above-described embodiment may be performed in the registration mode only when a new slave unit is registered. It may be performed every time communication starts.

Further, the generation information for generating the hop table may be transmitted at any time during the communication to further enhance the confidentiality.

[0152]

As described above, according to the first aspect of the present invention, the confidential information for concealing the information to be transmitted / received is encrypted and transmitted from the master unit to the slave unit. Since information is acquired while concealment is released using the concealed information restored in the handset, information is not transferred between the base unit and the handset or between handset as compared to the case where only the concealment of the information itself is performed. Confidentiality is improved.

Also, even when a new handset having no concealment information is newly added to start the transmission / reception of information, the concealment information for transmission / reception is encrypted and transmitted to the handset. Does not leak to the outside, and the confidentiality in information transfer is improved.

According to the second aspect of the present invention, the identification information is encrypted based on the encryption key information and transmitted, and after receiving and restoring, it is determined whether or not the slave unit is the set slave unit. Can be surely identified and the information can be exchanged without the information being known to the outside.

Therefore, it is possible to prevent information from being transmitted to the slave units other than the set slave unit, and it is possible to further enhance the confidentiality of the information.

According to the third aspect of the present invention, the confidential information for concealing the information to be transmitted / received is encrypted, transmitted from the master unit to the slave unit, and the concealed information restored in the slave unit is transmitted. Since the information is acquired while the concealment is canceled by using the information, the confidentiality of the information in the transfer between the parent device and the child device or between the child devices is improved as compared with the case where only the information itself is concealed.

[0157] Also, even when information transfer is started by newly adding a slave unit having no concealment information in advance, the confidential information for transfer is encrypted and transmitted to the slave unit. Does not leak to the outside, and the confidentiality in information transfer is improved.

According to the invention set forth in claim 4, according to claim 3,
In addition to the effects of the invention described in (1), information concealment is performed by temporally changing the frequency used for transmission and reception of the information, and the concealment information is table information referred to when changing the frequency. Therefore, by confidentially transmitting and receiving the table information, the information can be concealed more effectively against eavesdropping and the like.

According to the invention set forth in claim 5, according to claim 3,
Or, in addition to the effect of the invention described in 4, since the encryption key information is a public key in the public key encryption system and the decryption key information is a secret key in the public key encryption system, the confidentiality of the information is further improved. be able to.

According to the invention described in claim 6, according to claim 4,
Or in addition to the effect of the invention described in 5, the concealment information is generation information for generating table information to be referred to when changing the frequency, and the slave generates the table information using the generation information. In addition, since the table information itself is encrypted as confidential information and transmitted from the master unit to the slave unit, the slave unit acquires and transmits the table information more quickly than in the case where the table information itself is encrypted as confidential information. The information can be decrypted.

According to the seventh aspect of the present invention, the identification information is encrypted based on the encryption key information and transmitted, and after receiving and restoring, it is determined whether or not the slave unit is the set slave unit. Is not known to the outside, and information can be transmitted and received by reliably identifying the set slave unit.

Therefore, it is possible to prevent information from being transmitted to the slave units other than the set slave unit, and it is possible to further enhance the confidentiality of the information.

According to the invention of claim 8, according to claim 7,
In addition to the effects of the invention described in the above, since the encryption key information is a public key in a public key encryption system and the decryption key information is a secret key in a public key encryption system, the confidentiality of information can be further improved. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a master device according to a first embodiment.

FIG. 2 is a block diagram illustrating a schematic configuration of a slave unit according to the first embodiment.

FIG. 3 is a diagram illustrating an example of a frame configuration and a hop table; FIG. 3A is a diagram illustrating a frame configuration;
(B) is a diagram showing an example of a hop table.

FIG. 4 is a flowchart showing an operation of the master unit of the first embodiment.

FIG. 5 is a flowchart showing an operation of the slave unit of the first embodiment.

FIG. 6 is a block diagram illustrating a schematic configuration of a master unit according to a second embodiment.

FIG. 7 is a block diagram illustrating a schematic configuration of a slave unit according to the second embodiment.

FIG. 8 is a block diagram illustrating a schematic configuration of a master unit according to a third embodiment.

FIG. 9 is a block diagram illustrating a schematic configuration of a slave according to a third embodiment.

FIG. 10 is a flowchart illustrating an operation of a master unit according to the third embodiment.

FIG. 11 is a flowchart showing an operation of the slave unit of the third embodiment.

[Explanation of symbols]

1, 20 ... Transceiver unit 2, 21 ... Interface 3, 22 ... Modulator / demodulator 4, 23 ... Up converter 5, 24 ... Power amplifier 6, 25 ... Transmission / reception switch 7, 26 ... Low noise amplifier 8, 27 ... Down converter 9, 28 PLL 10, 30, 10 ', 30', 10 ", 30" ... main body 11, 31, 40, 50, 60, 70 ... RAM 11A, 31A ... hop table storage unit 12 ... encryptors 13, 33 ... Changeover switches 14, 34 Controller 15, 35 Power supply 16, 17 Frame 16A, 17A Frequency hop phase block 16B, 17D Transmission phase block 16C, 17C Transmission / reception switching phase block 16D, 17B Reception phase block 32 ... Decoders 40A, 50A ... Initial value storage units 41, 51 ... Hop table generation Vessel 60A, 70A ... password storage unit SO, SO ', SO "... the parent device SC, SC', SC" ... the handset Stt ... table signal Sif ... information signal Sta ... encryption table signal Sko ... public key signal Ssw _1, Ssw ₂ , Sm, Spl ... Control signal Sc ... Local signal St ... Transmission signal Sr ... Reception signal Smi ... Modulation signal Sni ... Demodulation signal Ssc ... Private key signal Si ... Initial value signal Sia ... Encryption initial value signal Spw ... Password signal Stw: Encrypted password signal ANT: Antenna

Claims (8)

[Claims] 1. A wireless communication method for exchanging information between a parent device and a child device or between the child devices while concealing and decrypting the information using concealment information and wirelessly performing decryption. Wherein the concealed information for receiving the concealed information from the master unit at the slave unit to release the concealment and decrypt the concealment information does not have the concealment information from the master unit. When transmitting to the slave unit, an encryption key information transmitting step of transmitting encryption key information for encrypting the confidential information from the slave unit to the master unit; Encrypting the concealment information based on the obtained encryption key information and generating encrypted concealment information; and transmitting the generated encrypted concealment information from the master unit to the slave unit. Concealed information transmitting step, and A decryption step of decrypting the encrypted encrypted confidential information received using predetermined decryption key information corresponding to the encryption key information, and restoring the confidential information. Method. And transmitting and receiving identification information for identifying whether or not the child device is a preset child device in the parent device between the parent device and the child device. A wireless communication method for wirelessly transmitting and receiving information between the master unit and the setting slave unit while performing concealment wirelessly, wherein the encryption key information for encrypting the identification information is An encryption key information transmission step of transmitting from the master unit to the slave unit, and an encryption step of encrypting the identification information based on the received encryption key information in the slave unit to generate encryption identification information; An identification information transmitting step of transmitting the generated encrypted identification information from the slave unit to the master unit; and in the master unit, the transmitted encryption identification information is set in advance corresponding to the encryption key information. Decrypted using the decryption key information A restoring step of restoring identification information, and a judging step of judging whether or not the slave unit that transmitted the encrypted identification information is the set slave unit based on the restored identification information in the master unit. And transmitting the information from the master unit to the setting slave unit when it is determined that the slave unit that has transmitted the encrypted identification information is the setting slave unit. A wireless communication method comprising: 3. A wireless communication system for transmitting and receiving information between a parent device and a child device or between the child devices while concealing and decrypting the information using concealment information and wirelessly. The encryption key information transmitting means included in the slave unit, wherein the concealment information for receiving the concealed information from the master unit in the slave unit, and canceling and decrypting the concealment information. Is transmitted from the master unit to the slave unit not having the concealment information, the encryption key information transmitting means for transmitting encryption key information for encrypting the concealment information to the base unit. An encryption unit that is included in the master unit, encrypts the concealment information based on the received encryption key information, and generates encrypted concealment information. Sends the generated encrypted concealment information to the slave unit. Confidential information transmitting means, which is included in the slave unit, and decrypts the transmitted encrypted confidential information using preset decryption key information corresponding to the encryption key information; And a restoring means for restoring encryption information. 4. The wireless communication system according to claim 3, wherein the concealment of the information is performed by temporally changing a frequency used for transmission and reception of the information, and the concealment information is the frequency. Wireless communication system characterized by table information that is referred to when changing. 5. The wireless communication system according to claim 3, wherein the encryption key information is a public key in a public key encryption system, and the decryption key information is a secret key in the public key encryption system. A wireless communication system, comprising: 6. The wireless communication system according to claim 4, wherein the concealment information is generation information for generating table information referred to when changing the frequency, and the slave unit is And a generating unit for generating the table information using the generated information. 7. Transmission and reception of identification information for identifying whether or not the child device is a preset child device in the parent device between the parent device and the child device, A wireless communication system for wirelessly transmitting and receiving information between the master unit and the setting slave unit while wirelessly performing concealment, and an encryption key information transmitting unit included in the master unit. An encryption key information transmitting means for transmitting encryption key information for encrypting the identification information to the slave unit, and including the identification information based on the received encryption key information while being included in the slave unit. An encryption unit that encrypts and generates encrypted identification information; an identification information transmission unit that is included in the slave unit and that transmits the generated encrypted identification information to the master unit; and is included in the master unit. Together with the transmitted encrypted identification information Decryption means for decrypting using the previously set decryption key information corresponding to the encryption key information and restoring the identification information, the decryption means being included in the master unit and encrypting based on the restored identification information; Determining means for determining whether or not the slave unit that has transmitted the identification information is the set slave unit; and the slave unit that is included in the master unit and that has transmitted the encrypted identification information is the set slave unit. Transmitting means for transmitting the information to the setting slave unit when it is determined that there is a wireless communication device. 8. The wireless communication system according to claim 7, wherein the encryption key information is a public key in a public key encryption system, and the decryption key information is a secret key in the public key encryption system. A wireless communication system, comprising: