WO2008059569A1

WO2008059569A1 - Communication terminal apparatus, content distributing apparatus, content distributing system, content distributing method and content receiving method

Info

Publication number: WO2008059569A1
Application number: PCT/JP2006/322769
Authority: WO
Inventors: Naoki Adachi
Original assignee: Panasonic Corporation
Priority date: 2006-11-15
Filing date: 2006-11-15
Publication date: 2008-05-22

Abstract

A communication terminal apparatus wherein a higher transmission speed during a content distribution is achieved to allow a large amount of contents to be distributed within a short time in which they pass a gate. In this apparatus, a noncontact communication part (111) transmits a user ID, a content number and ticket information and receives a use permission key. A wireless communication part (113), which is activated when the noncontact communication part (111) receives a communication area signal, receives contents at a transmission speed that is higher than a transmission speed at which the noncontact communication part (111) receives the use permission key. A use permission key decoding part (115) uses the user ID to decode the use permission key, thereby generating a decoding key. A content decoding part (116) uses the decoding key to decode a content.

Description

Specification

COMMUNICATION TERMINAL APPARATUS, CONTENTS S COMMUNICATION APPARATUS, CONTENTS S COMMUNICATION SYSTEM, CONTENT DISTRIBUTION METHOD, AND CONTENT RECEPTION METHOD

Technical field

The present invention relates to a communication terminal device, a content distribution device, a content distribution system, and a content distribution method that perform distribution and reception of content during a short period of time passing through a gate, for example.

Background art

Conventionally, as a method for notifying information in a content distribution system, for example, when a user passes an automatic ticket gate, the departure time and arrival time of a transportation facility that can be used by the user following the passing process In addition, a system that provides transportation use information such as the presence / absence of transfer is known (for example, Patent Document 1). FIG. 1 is a schematic diagram for explaining a conventional content distribution system described in Patent Document 1. In FIG.

[0003] In FIG. 1, when a user 1 carrying a wireless commuter pass 2 in which user information such as a service section is written passes the automatic ticket gate 3 to the automatic ticket gate 3 from the wireless commuter pass 2 User information is sent. The automatic ticket gate 3 that has received the user information is based on the user information and timetable data, and the transportation system such as the departure time, arrival time, and whether or not there is a transfer available to the user 1 at the present time. Calculate usage information and send the calculated transportation usage information to the wireless commuter pass 2.

Patent Document 1: Japanese Patent Laid-Open No. 7-81804

Disclosure of the invention

Problems to be solved by the invention

[0004] However, in the conventional system, the communication between the wireless commuter pass 2 and the automatic ticket gate 3 has a relatively small capacity such as user information such as a service section and ID number, and transportation use information, etc. Because it is a low-speed contactless communication suitable for information transfer, it is impossible to provide large contents with a capacity of several megabytes in a short time passing through the gate 4! / And! / There is. [0005] An object of the present invention is to provide a communication terminal device capable of delivering a large amount of content during a short time passing through a gate by increasing the transmission speed at the time of content delivery. A content distribution apparatus, a content distribution system, a content distribution method, and a content reception method are provided.

Means for solving the problem

[0006] The communication terminal device of the present invention includes a storage unit that preferentially stores identification information that is information for identifying a user and content specification information that is information for specifying content, and a communication unit. Transmitting means for transmitting the identification information and the content specifying information stored in the storage means to the communication partner when recognizing that it is within communication range with the communication partner by approaching the partner; A use permission key generated by the communication partner encrypting the decryption key for decrypting the content specified by the content specifying information transmitted by the transmitting means with the identification information transmitted by the transmitting means. A first receiving means for receiving the content, and the content transmitted by the transmitting means at a transmission speed higher than a transmission speed at which the first receiving means receives the use permission key. A second receiving means for receiving the content specified by the specific information, and a use for generating the decryption key by decrypting the use permission key received by the first receiving means with the identification information transmitted by the transmitting means. It adopts a configuration comprising permission key decryption means and content decryption means for decrypting the content received by the second reception means using the generated decryption key.

[0007] The content distribution apparatus of the present invention receives identification information that is information for identifying the communication partner and content specification information that is information for specifying the content when the communication partner approaches. A receiving means; a use permission key calculating means for generating a use permission key by encrypting a decryption key for decrypting the content specified by the received content specifying information with the received identification information; A first transmission means for transmitting a use permission key, a content selection means for selecting the content specified by the received content specifying information, and the use permission key for transmitting the selected content by the first transmission means. And a second transmission means for transmitting at a transmission rate higher than the transmission rate at the time of transmission. [0008] The content distribution system of the present invention is a content authentication system comprising a communication terminal device that receives content distribution and a content authentication device that communicates content, wherein the communication terminal device is A storage unit that preliminarily stores and stores identification information that is information for identifying the communication terminal device and content specifying information that is information for specifying content; and Transmitting means for transmitting the identification information and content specifying information stored in the storage means to the content distribution apparatus when recognizing that it is within communication range with the content distribution apparatus; and The decryption key for decrypting the content specified by the content specifying information transmitted by the transmitting means is the identification information transmitted by the transmitting means. The first receiving means for receiving the use permission key generated by encrypting the content distribution device at a transmission speed higher than the transmission speed at which the first receiving means receives the use permission key. The second receiving means for receiving the content specified by the content specifying information transmitted by the transmitting means, and the use permission key received by the first receiving means are decrypted by the identification information transmitted by the transmitting means. The content distribution device comprises: a use permission key decryption unit that generates the decryption key; and a content decryption unit that decrypts the content received by the second reception unit using the generated decryption key. Is identification information that is information for identifying the communication terminal device when the communication terminal device approaches and information for specifying the content Receiving means for receiving content specifying information, and generating a use permission key by encrypting a decryption key for decrypting the content specified by the received content specifying information with the received identification information A calculation means; a first transmission means for transmitting the generated use permission key; a content selection means for selecting content specified by the received content specifying information; and the selected content by the first transmission means. And a second transmission means for transmitting at a transmission rate higher than the transmission rate at the time of transmitting the use permission key.

[0009] The content distribution method of the present invention is content that is identification information that is information for identifying the communication terminal device and information for specifying the content when the communication terminal device and the content distribution device are close to each other. The content distribution device receives the specific information. Generating a use permission key by encrypting a decryption key for decrypting the content specified by the received content specifying information with the received identification information. Transmitting the use permission key from the content distribution device to the communication terminal device; selecting the content specified by the received content specifying information; and selecting the selected content. Transmitting from the content distribution device to the communication terminal device at a transmission speed higher than the transmission speed at the time of transmitting the use permission key.

[0010] The content receiving method of the present invention allows a user to be identified when the communication terminal device recognizes that the communication terminal device is within communication range with the content distribution device due to the proximity of the communication terminal device and the content distribution device. The communication terminal device transmits identification information, which is information for identification, and content specification information, which is information for specifying content, to the content distribution device, and the content specified by the transmitted content specification information The communication terminal device receives the use permission key generated by the content distribution device encrypting the decryption key for decrypting the received key with the transmitted identification information, and the use permission key is received. The content specified by the transmitted content specifying information is transmitted at a transmission rate higher than the transmission rate at the time of transmission. A step of receiving by the terminal device; a step of generating the decryption key by decrypting the received use permission key by the transmitted identification information; and the decryption key generated by the communication terminal device. And a step of decrypting the received content.

The invention's effect

[0011] According to the present invention, it is possible to deliver a large amount of content in a short time passing through the gate by increasing the transmission speed at the time of content delivery. Explanation

[0012] FIG. 1 is a schematic diagram showing a conventional content distribution system.

FIG. 2 is a diagram showing a content distribution system according to Embodiment 1 of the present invention. FIG. 3 is a diagram showing operations of the communication terminal device and the content distribution device according to Embodiment 1 of the present invention.

FIG. 4 is a diagram showing a method for exchanging the user ID, ticket information, and content number according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a method for delivering a use permission key according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the communication terminal apparatus according to Embodiment 1 of the present invention.

FIG. 7 is a flowchart showing the operation of the communication terminal apparatus according to Embodiment 2 of the present invention.

FIG. 8 is a flowchart showing the operation of the content distribution apparatus according to the second embodiment of the present invention.

FIG. 9 shows a content distribution system according to Embodiment 3 of the present invention.

FIG. 10 is a flowchart showing the operation of the communication terminal apparatus according to Embodiment 3 of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0014] (Embodiment 1)

FIG. 2 is a block diagram showing the content distribution system 100 according to Embodiment 1 of the present invention. The content distribution system 100 includes a communication terminal device 101 and a content distribution device 10.

It consists of two.

[0015] The communication terminal device 101 is a device that is carried and used by a user such as a mobile phone and a PDA equipped with a non-contact commuter pass, a non-contact ticket, or a non-contact ticket, for example. The content distribution device 102 is provided in a non-contact automatic ticket gate provided in public transportation such as a train and a subway, and a non-contact gate device provided in a museum and an amusement facility. The non-contact gate device provided with the content distribution device 102 is a valid section such as a non-contact periodic ticket, a non-contact ticket, a non-contact ticket, etc. possessed by a user read from the communication terminal device 101 using non-contact communication. Permits passage when ticket information such as validity period is valid.

First, the configuration of communication terminal apparatus 101 will be described using FIG.

The storage unit 110 stores a user ID (identification information), ticket information (user information), and a content number (content specifying information) for identifying a user who uses the communication terminal device 101. Yes. The storage unit 110 stores the stored user ID, ticket information, and content. Number is output to the non-contact communication unit 111. The storage unit 110 temporarily stores the use permission key input from the non-contact communication unit 111, and stores the use permission key stored therein.

The user ID stored and output to the non-contact communication unit 111 when acquiring the use permission key is output to the use permission key decryption unit 115. Here, the ticket information is, for example, information for determining whether or not a user who enters an arbitrary place is allowed to enter, or whether or not a user who leaves an arbitrary place is allowed to leave. This is information for judging, such as information on the validity period of contactless commuter passes.

[0018] The non-contact communication unit 111, which is a transmission unit and a first reception unit, encrypts data with the non-contact communication unit 120 using a public key cryptosystem and an encryption key and a composite key. Deliver information that has been converted to The non-contact communication unit 111 is activated when it receives a communication area signal transmitted from the non-contact communication unit 120 due to its proximity to the content distribution device 102, and is in a communication range with the non-contact communication unit 120. And the user ID, ticket information, and content number are read from the storage unit 110. Then, the non-contact communication unit 111 encrypts the read user ID, the ticket information, and the content number with the encryption key and transmits it. The non-contact communication unit 111 receives the use permission key transmitted by the non-contact communication unit 120. Then, the non-contact communication unit 111 decrypts the received use permission key with the decryption key and outputs it to the storage unit 110, and outputs the received communication area signal to the signal detection unit 112.

The signal detection unit 112 performs control to activate the wireless communication unit 113 when a communication area signal is input from the non-contact communication unit 111.

[0020] The wireless communication unit 113 as the second receiving means has a communication area comparable to that of the non-contact communication unit 111, that is, a narrow communication area in which only one communication terminal apparatus 101 can communicate with the content distribution apparatus 102. Communication is possible (for example, communication area 5 in FIG. 1), and high-speed data transmission corresponding to, for example, lGbps is possible. Further, after activation, the wireless communication unit 113 receives the encrypted content transmitted from the wireless communication unit 125 in parallel with the non-contact communication unit 111 receiving the use permission key. Then, the wireless communication unit 113 outputs the received encrypted content to the content storage unit 114. The wireless communication unit 113 can use broadband communication such as UWB (Ultra Wide Band). Content storage unit 114 temporarily stores the encrypted content input from wireless communication unit 113 and outputs the stored content to content decryption unit 116 at a predetermined timing.

[0022] The use permission key decryption unit 115 reads out the use permission key that is stored in the storage unit 110 and is encrypted, and the storage unit 110 is contactless when acquiring the read use permission key. The user ID output to the communication unit 111 is read from the storage unit 110. Then, the use permission key decryption unit 115 decrypts the use permission key with the user ID to generate a key ID (decryption key), and outputs the generated key ID to the content decryption unit 116.

The content decryption unit 116 decrypts the encrypted content input from the content storage unit 114 with the key ID input from the use permission key decryption unit 115, and the decrypted content is transmitted to the content use unit 117. Output to.

The content using unit 117 uses the content input from the content decrypting unit 116. For example, the content use unit 117 reproduces if the content is music data or image data, and displays if the content is document data such as a newspaper or an electronic book.

Next, the configuration of content distribution apparatus 102 will be described using FIG.

[0026] The non-contact communication unit 120, which is the receiving unit and the first transmission unit, encrypts data with the non-contact communication unit 111 by using a public key cryptosystem and an encryption key and a composite key. Deliver information that has been converted to Further, the non-contact communication unit 120 transmits the communication area signal, and the encryption transmitted from the non-contact communication section 111 is performed by wireless communication with the non-contact communication section 111 of the communication terminal device 101 that has detected the transmitted communication area signal. The received user ID, ticket information, and content number are received, and the received user ID, ticket information, and content number are decrypted with the decryption key. Further, the non-contact communication unit 120 outputs the decrypted content number to the decryption key selection unit 121 and the content selection unit 124, and also outputs the decrypted content number to the wireless communication unit 125 to activate the wireless communication unit 125. The non-contact communication unit 120 outputs the decrypted user ID to the use permission key calculation unit 122. Further, the non-contact communication unit 120 encrypts the use permission key input from the use permission key calculation unit 122 with the encryption key and transmits it. Further, the non-contact communication unit 120 decrypts the received encrypted ticket information with the decryption key, and outputs the decrypted ticket information to a passage permission control unit (not shown) that performs processing for permitting passage of a gate or the like. . Na The passage permission control unit controls the opening and closing of the gate with reference to the ticket information.

[0027] The decryption key selection unit 121 uses the content number input from the non-contact communication unit 120 to store the content number in the table 123 and refers to the content distribution information, and is related to the content number. Select the key ID. Then, the decryption key selection unit 121 outputs the selected key ID to the use permission key calculation unit 122.

The usage permission key calculation unit 122 generates a usage permission key based on the user ID input from the non-contact communication unit 120. For example, the use permission key calculation unit 122 uses the user ID input from the non-contact communication unit 120 and the key ID input from the decryption key selection unit 121 according to a predetermined rule shared by the communication terminal device 101. Generate usage permission keys by performing four basic operations. Then, the use permission key calculation unit 122 outputs the generated use permission key to the non-contact communication unit 120. The use permission key calculation unit 122 stores a number according to a predetermined rule shared with the communication terminal device 101 for the user ID input from the non-contact communication unit 120 and uses the use permission key. May be generated. In this case, it is effective when the length of the user ID does not match the length of the V ヽ crypt key used.

[0029] The table 123 stores content distribution information in which content numbers, encrypted content, and key IDs are associated with each other.

[0030] The content selection unit 124 uses the content number input from the non-contact communication unit 120 to refer to the content distribution information stored in the table 123, thereby encrypting the encryption associated with the content number. Select the selected content. Then, the content selection unit 124 outputs the selected encrypted content to the wireless communication unit 125.

[0031] Similar to the wireless communication unit 113, the wireless communication unit 125 as the second transmission means can use wideband communication such as UWB, for example, and has a wireless communication area similar to that of the non-contact communication unit 120. The unit performs wireless communication with the communication unit 113, and is activated when a content number is input from the non-contact communication unit 120. In addition, after being activated, the wireless communication unit 125 transmits the encrypted content input from the content selection unit 124 at a transmission rate higher than the transmission rate at which the non-contact communication unit 120 transmits the use permission key. To do. Here, the encrypted content is a sign key with a decryption key associated with the content in the table 123. Means content that has been added. For example, content obtained by encoding content A with key A is encrypted.

Next, operations of communication terminal apparatus 101 and content distribution apparatus 102 will be described with reference to FIG. FIG. 3 is a diagram illustrating operations of communication terminal apparatus 101 and content distribution apparatus 102.

[0033] When non-contact communication unit 111 of communication terminal device 101 is in a standby state (step ST301), non-contact communication unit 120 of content distribution device 102 is a communication region for detecting that it is within the communication region. A signal is transmitted (step ST302). Such as by passing the user force S content delivery apparatus ₁₀ 2 of the communication terminal device 101, by communication terminal device 101 is proximate to the content delivery apparatus 102, the communication area signal transmitted from the non-contact communication section 120, non The signal is received by contact communication section 111 (step ST303), and output from non-contact communication section 111 to signal detection section 112 (step ST304). Then, signal detection section 112 detects a communication area signal (step ST305), and outputs a communication area detection signal for activating radio communication section 113 (step ST306). Receiving the communication area detection signal, the wireless communication unit 113 activates a broadband communication function for receiving encrypted content (step ST307), and shifts to a standby state (step ST308). At the same time, non-contact communication unit 111 is activated in preparation for information exchange with non-contact communication unit 120 (step ST309).

[0034] The non-contact communication unit 111 in the communication area of the non-contact communication unit 120 securely passes the user ID, the ticket information, and the content number to the non-contact communication unit 120 using the public key cryptosystem (step ST310).

[0035] Non-contact communication unit 120 outputs the received content number to radio communication unit 125 (step ST311), and has received a content number having a communication area comparable to non-contact communication unit 120. Radio communication unit 125 is activated (step ST312).

[0036] When the contactless communication unit 120 outputs the content number to the decryption key selection unit 121, the decryption key selection unit 121 selects the key ID, and the use permission key calculation unit 122 receives the decryption key selection unit 121 from the decryption key selection unit 121. Acquires the selected key ID, receives the user ID from the non-contact communication unit 120 (step ST313), and generates the use permission key by encrypting the key ID with the user ID (step ST314). . Non-contact communication unit 120 is a usage permission key calculation unit 1 The use permission key is received from 22 (step ST315), and the received use permission key is securely passed to the contactless communication unit 111 in the communication area of the contactless communication unit 120 by the public key cryptosystem (step ST316).

[0037] Content distribution apparatus 101 determines whether or not the user can pass from the acquired ticket information, and if the ticket information is valid, the user is allowed to pass through and performs a ticket gate process (step ST317) ₀ and The non-contact communication unit 111 stops the information transfer function and finishes the ticket gate operation (step ST318), the non-contact communication unit 120 also stops the information transfer function, and the content distribution apparatus 102 permits the ticket check. Is displayed and the ticket gate operation is terminated (step ST3 19). Non-contact communication unit 111 enters a standby state that is the same operation as step ST301 (step ST320), and non-contact communication unit 120 transmits a communication area signal that is the same operation as step ST302 (step ST321). Return to the initial operation.

[0038] On the other hand, the wireless communication unit 125 activated in step ST312 having a communication area comparable to that of the non-contact communication unit 120 receives the encrypted content specified by the content number from the content selection unit 124. To start receiving the received content (step ST32

2) Content is transmitted from wireless communication unit 125 to wireless communication unit 113 (step ST32

3). The communication terminal device 101 in the communication area of the non-contact communication unit 120 has the same communication area of the wireless communication unit 125 as that of the non-contact communication unit 120. It can be identified that the content encrypted by the wireless communication unit 113 is securely received (step ST324). When the transmission of the encrypted content ends, wireless communication section 125 stops the communication function and ends the operation (step ST325). Communication terminal apparatus 101 that has received the encrypted content reports the completion status of the reception operation to the user (step ST326), and wireless communication unit 113 stops the wireless communication function and ends the operation ( Step ST327).

[0039] For example, when the contactless communication unit 120 receives the content number 004, the decryption key selection unit 121 uses the content number 004 to identify the key ID (key D associated with the content number 004 from the table 123). ). Then, the use permission key calculation unit 122 generates a use permission key by encrypting the key ID (key D) with the user ID. On the other hand, upon receiving the content number 004, the content selection unit 124 receives the received content Using the number 004, the content D associated with the content number 004 is read from the table 123, and the wireless communication unit 125 starts transmitting the content D.

Next, a method for transferring the user ID, ticket information, and content number by the public key cryptosystem will be described with reference to FIG. FIG. 4 is a diagram showing a method for transferring the user ID, ticket information, and content number.

From FIG. 4, non-contact communication unit 120 generates an encryption key and a decryption key (step ST 401), and transmits the encryption key to non-contact communication unit 111 (step ST 402). The contactless communication unit 111 encrypts the user ID, ticket information, and content number with the acquired encryption key (step ST403), and contactlessly encrypts the user ID, ticket information, and content number. Transmit to communication section 120 (step ST404). The non-contact communication unit 120 decrypts the received user ID, ticket information, and content number using the decryption key generated in step ST401, so that the user ID, the ticket information 114, and the content are decrypted. The number 115 is acquired (step ST 405). As described above, since the communication terminal device 101 and the content distribution device 102 encrypt information in a limited communication area and deliver information such as a user ID, the safety can be improved.

[0042] Next, a method for delivering the use permission key by the public key cryptosystem will be described with reference to FIG. FIG. 5 is a diagram showing a method for transferring the use permission key.

From FIG. 5, contactless communication section 111 generates an encryption key and a decryption key (step ST501), and transmits the encryption key to contactless communication section 120 (step ST502). The non-contact communication unit 120 encrypts the use permission key with the acquired encryption key (step ST503), and transmits the encrypted use permission key to the non-contact communication unit 111 (step ST504). The non-contact communication unit 111 acquires the use permission key by decrypting the received use permission key using the decryption key generated in step ST501 (step ST505). Since the communication area of the wireless communication unit 125 is limited to about the non-contact communication unit 120, it is possible to increase safety against eavesdropping and the like when distributing encrypted content.

[0044] Although the operation for generating the encryption key and the decryption key each time has been described with reference to FIGS. 4 and 5, it is desirable in terms of improving security, but it is necessary because it has a tradeoff with processing time. Depending on the situation, the encryption and decryption keys are played back at regular intervals, for example, once a day. The keys of encryption key and decryption key created separately or stored in a table or the like may be called up and used sequentially. Further, depending on the degree of security required, limiting the communication area by non-contact communication only reduces the possibility of leakage of communication contents to a third party, and encryption may not be performed. The encryption method is not limited to the public key encryption method, and any encryption method such as a secret key encryption method can be used.

Next, the operation of communication terminal apparatus 101 will be described using FIG. FIG. 6 is a flowchart showing the operation of the communication terminal device 101.

First, communication terminal apparatus 101 sets a content number (step ST601). As a method for setting the content number, the user of the communication terminal device 101 makes a contract for downloading content separately, and for example, when using the latest newspaper information as content, it is valid for a certain period such as the monthly pole. Get and set the content number.

Next, non-contact communication unit 111 of communication terminal apparatus 101 detects whether or not it is within the area of communication area 5 of automatic ticket gate 3 provided with content distribution apparatus 102 (step ST602).

[0048] When it is detected that it is within the area of communication area 5 of automatic ticket gate 3, communication terminal apparatus 101 activates non-contact communication section 111 (step ST603). On the other hand, if the communication terminal device 101 does not detect that it is within the communication area 5 of the automatic ticket gate 3, the communication terminal device 101 does not activate the non-contact communication unit 111 and The detection process is repeated at a predetermined timing until it is detected to be within the area.

[0049] Next, contactless communication section 111 reads the user ID, ticket information, and content number from storage section 110, and transmits the read user ID, ticket information, and content number (step ST604).

[0050] Next, non-contact communication section 111 acquires the use permission key by receiving the use permission key (step ST605).

[0051] Next, communication terminal apparatus 101 ends ticket gate processing by transmitting ticket information in step ST604 (step ST606), and the user of communication terminal apparatus 101 can pass through gate 4. .

[0052] Further, in parallel with the processing of step ST603 to step ST606, the communication terminal apparatus 101 The signal detection unit 112 activates the wireless communication unit 113 by detecting the communication area signal transmitted from the content distribution apparatus 102 (step ST607).

[0053] Radio communication section 113 receives the content (step ST608).

Next, the use permission key decryption unit 115 of the communication terminal device 101 decrypts the use permission key, and the content decryption unit 116 of the communication terminal device 101 decrypts the content (step ST609), and the communication terminal device 101 The content using unit 117 reproduces the content.

[0055] When receiving the content distribution, the communication terminal device 101 acquires the content number list in the non-contact communication unit 111, and stores the acquired content number list in the storage unit 110, so that the communication terminal device 101 is used next time. May be. In this case, you can use the payment function provided in the non-contact communication unit 111 to make payments!

[0056] As described above, according to the first embodiment, it is possible to distribute a large amount of content during a short time passing through the gate by increasing the transmission speed at the time of content distribution. Can be. Further, according to the first embodiment, the content distribution device distributes the use permission key generated using the user ID used when passing through the gate, and the communication terminal device uses the user ID to transmit the use permission key. Since the decryption key is generated by decryption and the content is decrypted with the generated decryption key, the safety when using the content can be improved. Further, according to the first embodiment, since the user ID, ticket information, content number, and usage permission key are transferred by the public key cryptosystem, safety against eavesdropping at the time of content distribution can be increased. Further, according to the first embodiment, since the wireless communication unit 113 has a communication area comparable to that of the non-contact communication unit 111, there is a possibility that communication by the wireless communication unit 113 may be intercepted by another device. Can be reduced, and safety against eavesdropping can be improved.

[Embodiment 2]

The second embodiment is characterized in that the communication terminal apparatus collectively receives and stores the use permission key, and the content can be decrypted even by using the stored use permission key. .

FIG. 7 is a flowchart showing the operation of the communication terminal apparatus according to Embodiment 2 of the present invention, and FIG. 8 is a flowchart showing the operation of the content distribution apparatus according to Embodiment 2 of the present invention. so is there. In the second embodiment, the configuration of the communication terminal device and the configuration of the content distribution device are the same as those in FIG.

[0059] If the content can be acquired for a predetermined number of days (for example, one month) by a monthly contract, etc., the communication terminal device 101 will start the next day within the period during which content can be acquired by a monthly contract, etc. The usage permission key used for the transmission may be preliminarily transmitted from the content distribution apparatus 102, and the non-contact communication unit 111 may receive the preliminarily transmitted usage permission key.

First, the operation of communication terminal apparatus 101 will be described using FIG. 1, FIG. 2, and FIG.

[0061] Communication terminal apparatus 101 sets a content number (step ST701). As a method for setting the content number, the user of the communication terminal device 101 contracts for downloading content separately, and, for example, when the latest newspaper information is used as the content, the content number is valid for a certain period such as the monthly pole. Get and set

[0062] Next, contactless communication section 111 of communication terminal apparatus 101 detects whether or not it is within the area of communication area 5 of automatic ticket gate 3 provided with content distribution apparatus 102 (step ST702).

[0063] If it is detected that it is within the communication area 5 of the automatic ticket gate 3, the communication terminal apparatus 101 activates the non-contact communication unit 111 (step ST703). On the other hand, if the communication terminal device 101 does not detect that it is within the communication area 5 of the automatic ticket gate 3, the communication terminal device 101 does not activate the non-contact communication unit 111 and The detection process is repeated at a predetermined timing until it is detected to be within the area.

[0064] Next, contactless communication section 111 reads the user ID, ticket information, and content number from storage section 110, and transmits the read user ID, ticket information, and content number (step ST704).

Next, communication terminal apparatus 101 terminates the ticket gate processing by transmitting ticket information in step ST704 (step ST705), and the user of communication terminal apparatus 101 can pass through gate 4. .

Next, contactless communication section 111 of communication terminal apparatus 101 determines whether or not the use permission key has been successfully received (step ST706). [0067] If reception is successful, contactless communication section 111 determines whether or not a spare use permission key has been received (step ST707). Here, the spare use permission key is a use permission key that is currently unusable but can be used in the future.For example, it is currently distributed and cannot be used for decrypting content, but it is distributed after the next day. This is a usage permission key used when decrypting content.

[0068] When the reserve use permission key is received, storage section 110 of communication terminal apparatus 101 stores the reserve use permission key (step ST708).

[0069] In step ST706, when the reception is successful, the non-contact communication unit 111 of the communication terminal apparatus 101 can be used for decrypting the content in the use permission key stored in the storage unit 110. When the usage permission key exists, the corresponding usage permission key is read from the storage unit 110 and output to the usage permission key decryption unit 115 (step ST709).

[0070] In parallel with the processing of step ST703 to step ST709, signal detection section 112 of communication terminal apparatus 101 detects wireless communication section 113 transmitted from content distribution apparatus 102, thereby wireless communication section 113. Is activated (step ST710).

[0071] Radio communication section 113 receives the content (step ST711).

Next, the use permission key decryption unit 115 of the communication terminal apparatus 101 decrypts the received use permission key or the spare use permission key stored in advance, and the communication terminal apparatus 101 copies it. The content decryption unit 116 decrypts the content (step ST712), and the content use unit 117 of the communication terminal device 101 reproduces the content.

Next, the operation of content distribution apparatus 102 will be described using FIG. 1, FIG. 2, and FIG.

[0074] First, contactless communication section 120 of content distribution apparatus 102 receives the user ID (step ST801).

[0075] Next, the decryption key selection unit 121 of the content distribution device 102 stores the contract details of the user of the communication terminal device 101. Based on the acquired user ID, for example, the content is also stored after the next day. It is determined whether or not it is a contract to be distributed (step ST802).

[0076] When the content is distributed after the next day, the decryption key selection unit 121 distributes the decryption key used for generating the use permission key to be transmitted simultaneously with the content distribution and the next day and thereafter. A plurality of decryption keys with a spare decryption key used for decrypting the content to be selected are selected (step ST803). At this time, the table 123 of the content distribution device 102 uses the content distribution information stored in advance and the content number of the content to be distributed on the current day and the content number of the content to be transmitted from the next day according to the contract. Is stored in association with each other. As a result, the decryption key selection unit 121 can select a decryption key used for decrypting the content to be distributed on or after the next day.

[0077] Then, usage permission key calculation section 122 generates a usage permission key for each selected decryption key (step ST804).

On the other hand, in step ST802, when the contract is for distributing contents only on the current day, decryption key selection section 121 selects one decryption key (step ST805).

[0079] Then, use permission key calculation section 122 generates a use permission key using the selected one decryption key (step ST806).

[0080] Next, non-contact communication section 120 of content distribution apparatus 102 transmits a use permission key (step ST807).

As described above, according to the second embodiment, in addition to the effects of the first embodiment, the communication terminal apparatus receives and stores a preliminary use permission key to be used, for example, after the next day, Since the memorized use permission key is used for decrypting the content, the opportunity for obtaining the use permission key can be increased, and the possibility that the content cannot be used due to failure to obtain the use permission key is reduced. can do.

In the second embodiment, the content to be decrypted is distributed with a different usage permission key every day. However, the present invention is not limited to this, and a different usage permission key is set for each week such as every week. It is possible to distribute content that is decrypted by using different usage permission keys such as content that is decrypted using content or content that is decrypted by using different usage permission keys such as 6 hours. .

[0083] (Embodiment 3)

The third embodiment is characterized by notifying that the reception of the content has not been completed when the reception of the content has been completed while passing through the gate of an automatic ticket gate or the like. It is. FIG. 9 is a block diagram showing a configuration of content distribution system 900 according to Embodiment 3 of the present invention.

Communication terminal apparatus 901 according to Embodiment 3 adds reception quality measurement section 902 and notification section 903 to communication terminal apparatus 101 according to Embodiment 1 shown in FIG. 2, as shown in FIG. To do. In FIG. 9, the same components as those in FIG. 2 are denoted by the same reference numerals and description thereof is omitted.

The wireless communication unit 113 has a communication area comparable to that of the contactless communication unit 111, that is, a communication area that is narrow enough to allow only one communication terminal device 101 to communicate with the content distribution device 102 (for example, the communication shown in FIG. In addition to being able to communicate in area 5), high-speed data transmission equivalent to, for example, lGbps is possible, and is activated by the control of the signal detector 112. Radio communication section 113 outputs the received signal to reception quality measurement section 902. Further, after activation, the wireless communication unit 113 receives the encrypted content transmitted from the wireless communication unit 125 in parallel with the non-contact communication unit 111 receiving the use permission key. The wireless communication unit 113 decrypts the received content with the decryption key and outputs the decrypted content to the content storage unit 114. When the content reception is completed, the wireless communication unit 113 notifies the notification unit 903 that the content has been received. To do. For example, the wireless communication unit 113 can detect completion of content reception by detecting an identifier indicating the end of the content included in the content. The wireless communication unit 113 can use broadband communication such as UWB (Ultra Wide Band). Radio communication section 113 outputs the received signal to reception quality measurement section 902.

[0087] Reception quality measuring section 902 measures the reception strength of the received signal input from radio communication section 113. The reception quality measurement unit 902 compares the measured measurement result with a threshold value, and when the measurement result is less than or equal to the threshold value, the reception strength for the notification unit 903 is threshold V or less than the value. Notify that.

[0088] Informing unit 903 receives a notification from wireless communication unit 113 that the reception of content has been completed, and receives a notification from reception quality measuring unit 902 that the reception intensity is below the value. In addition, the user is informed that the content has not yet been received. At this time, the notification unit 903 has not yet received the content due to light, vibration, character display, or the like. To the user.

Next, the operation of communication terminal apparatus 901 will be described using FIG. FIG. 10 is a flowchart showing the operation of communication terminal apparatus 901. In FIG. 10, parts that are the same as in FIG. 6 are given the same reference numerals, and descriptions thereof are omitted.

[0090] In step ST606, the ticket gate processing is terminated, and after receiving the content by the wireless communication unit 113 in step ST608, the notification unit 903 of the communication terminal apparatus 101 determines whether or not the reception of the content is completed ( Step ST1001).

When it is determined that the content reception is completed, the notification unit 903 does not notify that the content reception is incomplete, and the usage permission key decryption unit 115 of the communication terminal device 101 Then, the use permission key is decrypted, content decrypting section 116 of communication terminal apparatus 101 decrypts the content (step ST1002), and content using section 117 of communication terminal apparatus 101 reproduces the content.

On the other hand, when it is determined that the content reception is not completed, notification section 903 notifies that the content reception is not completed (step ST1003). If the content has not yet been received, for example, the content distribution device 102 for the premises is placed at a place other than the gate such as a ticket gate such as a stair railing or a passage in the station, and the communication terminal device 901 notifies The user ID and content number are sent from the non-contact communication unit 111 to the content distribution device 102 located on the side of the passage in the station premises, etc. Re-acquire content that failed to be acquired at the time of passing through the gate from the content distribution device 102 arranged in the same location.

[0093] Thus, according to the third embodiment, in addition to the effect of the first embodiment, the user stops at the gate due to the failure to acquire the content, and the process of passing the gate is delayed. Can be avoided.

[0094] In Embodiments 1 to 3, the communication function is stopped when the exchange of predetermined information is completed in order to reduce power consumption. However, the present invention is not limited to this. The communication function does not have to be stopped when it is possible to receive the information and there is no need to consider interference with other systems. In the first to third embodiments, the non-contact communication unit 111 may be an RFID tag, and the non-contact communication unit 120 may be an RFI. A D reader may be used. Further, in Embodiments 1 to 3, as the wireless communication unit 113 and the wireless communication unit 125, in order to shorten the transmission time of encrypted content, for example, lGbps using a millimeter wave data transmission device Not only this, but also the transmission speed that can transmit the predetermined encrypted content during the time of about 1 second passing through the gate, it is not limited to lGbps. Further, the examples of the wireless communication unit 113 and the wireless communication unit 125 are not limited to broadband communication such as UWB, which explains broadband communication such as UWB. In Embodiments 1 to 3, the user ID is used as information for specifying the content use device. However, the present invention is not limited to this, and any information unique to the communication terminal device 101 may be used. Information or a number for specifying the storage unit 114 or the content use unit 117 may be used. Further, in Embodiments 1 to 3, the power of using a three-digit number as the content number is not limited to this, and the number of digits and the notation of the content number are not limited. Further, in Embodiments 1 to 3, the force applied to the gate system for controlling the passage of passage is not limited to this, and even if the gate function is not provided, the user stops and uses it for a short time. It can be applied to content delivery. Further, in Embodiments 1 to 3, the power that table 123 stores encrypted content is not limited to this, and unencrypted content is stored and wireless communication is performed. Content may be encrypted before part 125 communicates! /.

Industrial applicability

The communication terminal device, the content distribution device, the content distribution system, the content distribution method, and the content reception method according to the present invention distribute and receive a large amount of content in a short period of time, for example, through a gate. Useful for.

Claims

The scope of the claims

[1] Storage means for storing in advance identification information, which is information for identifying a user, and content specification information, which is information for specifying content,

Transmitting means for transmitting the identification information and content specifying information stored in the storage means to the communication partner when recognizing that the communication partner is within communication range by approaching the communication partner;

Receiving the use permission key generated by the communication partner encrypting the decryption key for decrypting the content specified by the content specifying information transmitted by the transmitting means with the identification information transmitted by the transmitting means. First receiving means for

Second receiving means for receiving the content specified by the content specifying information transmitted by the transmitting means at a transmission speed higher than the transmission speed at which the first receiving means receives the use permission key; ,

Use permission key decryption means for generating the decryption key by decrypting the use permission key received by the first reception means with the identification information transmitted by the transmission means;

Content decrypting means for decrypting the content received by the second receiving means using the generated decryption key;

A communication terminal device comprising:

[2] comprising signal detection means for detecting that the first receiving means has received a communication area signal, which is a signal indicating a communication area when content is distributed;

The communication terminal device according to claim 1, wherein the second receiving unit is activated to receive content when the signal detecting unit detects reception of the communication area signal.

3. The communication terminal apparatus according to claim 1, wherein the second receiving means receives content in parallel with the first receiving means receiving the use permission key.

[4] In addition to the identification information and the content specifying information, the storage means indicates whether or not the user is allowed to enter a given place or leave a given place. Stores user information, which is information for determination,

The transmission means stores the use in the storage means for the communication partner provided in the gate that passes when entering or leaving the place. The communication terminal device according to claim 1, wherein person information is transmitted.

[5] The transmitting means transmits the identification information and the content specifying information encrypted by a public key cryptosystem,

The communication terminal device according to claim 1, wherein the first receiving unit receives the use permission key encrypted by a public key cryptosystem.

[6] The first receiving means receives both the use permission key that can be used at present and the spare use permission key that cannot be used at present but can be used in the future.

In addition to the identification information and the content specifying information, the storage means stores the received backup use permission key,

2. The use permission key decrypting means generates the decryption key by decrypting the spare use permission key stored in the storage means with the identification information transmitted by the transmitting means. The communication terminal device described.

[7] Reception quality measuring means for measuring the reception quality of the received signal received by the second receiving means;

2. The communication terminal device according to claim 1, further comprising a notifying unit that notifies that reception of content received by the second receiving unit is not completed based on the measured reception quality.

[8] A receiving means for receiving identification information that is information for identifying the communication partner and content specifying information that is information for specifying the content when the communication partner approaches.

A use permission key calculating means for generating a use permission key by encrypting a decryption key for decrypting the content specified by the received content specifying information with the received identification information;

First transmission means for transmitting the generated use permission key;

Content selecting means for selecting content specified by the received content specifying information;

Second transmission means for transmitting the selected content at a transmission speed higher than the transmission speed at which the first transmission means transmits the use permission key; A content distribution apparatus comprising:

[9] Storage means for storing content delivery information in which the content specifying information is associated with the content and a decryption key for decrypting the content,

The use permission key calculating means selects the decryption key by referring to the content distribution information using the content specified by the received content specifying information, and receives the selected decryption key. Encrypting with the identification information to generate the use permission key,

9. The content distribution apparatus according to claim 8, wherein the content selection unit selects the content by referring to the content distribution information using the received content specifying information.

10. The content distribution apparatus according to claim 8, wherein the first transmission unit transmits a communication area signal that is a signal indicating a communication area when the content is distributed before the second transmission unit transmits the content.

11. The content distribution device according to claim 8, wherein the second transmission unit transmits the content in parallel with the first transmission unit transmitting the use permission key.

[12] A content self-communication system comprising a communication terminal device that receives content S communication and content that transmits content S communication device.

The communication terminal device

Storage means for storing in advance identification information, which is information for identifying the communication terminal device, and content specifying information, which is information for specifying content;

The identification information and the content specifying information stored in the storage means when the content distribution device recognizes that it is within the communication range with the content distribution device by approaching the content distribution device to the content distribution device. A transmission means for transmitting;

A use permission key generated by the content distribution device encrypting a decryption key for decrypting the content specified by the content specifying information transmitted by the transmission unit with the identification information transmitted by the transmission unit. And a content specified by the content specifying information transmitted by the transmitting means at a transmission speed higher than a transmission speed at which the first receiving means receives the use permission key. A second receiving means for receiving a number;

Comprising

The content distribution device includes:

Receiving means for receiving identification information, which is information for identifying the communication terminal device when the communication terminal device approaches, and content specifying information, which is information for specifying content;

First transmission means for transmitting the generated use permission key;

Second transmission means for transmitting the selected content at a transmission speed higher than the transmission speed at which the first transmission means transmits the use permission key;

Content self-confidence system.

The content distribution device receives identification information that is information for identifying the communication terminal device and content specification information that is information for specifying content when the communication terminal device and the content distribution device come close to each other. And steps to

The content distribution device encrypts a decryption key for decrypting the content specified by the received content specification information with the received identification information, and generates a use permission key;

Transmitting the generated use permission key from the content distribution device to the communication terminal device;

The content distribution device specifies the content specified by the received content specifying information. The step of selecting

A step of transmitting the selected content to the communication terminal device at a transmission rate higher than a transmission rate at the time of transmitting the use permission key.

Identification information that is information for identifying a user when the communication terminal device recognizes that the communication terminal device is within a communication area with the content distribution device due to the proximity of the communication terminal device and the content distribution device, and A step in which the communication terminal device transmits content specifying information, which is information for specifying content, to the content distribution device; and a decoding key for decoding the content specified by the transmitted content specifying information. The communication terminal device receiving a use permission key generated by the content distribution device encrypting with the transmitted identification information;

A step in which the communication terminal apparatus receives the content specified by the transmitted content specifying information at a transmission speed higher than the transmission speed at the time of receiving the use permission key;

The communication terminal apparatus generates the decryption key by decrypting the received use permission key with the transmitted identification information;

The communication terminal device decrypts the received content using the generated decryption key; and

A content receiving method comprising: