An encryption device, a decrypting device, a secret key generation device,a copyright protection system and a cipher communication device

A cryptographic communication and key technology, which is applied in key distribution, can solve the problem of illegal transmission of digital products, etc., and achieve the effect of safe transmission, high practical value, and prevention of attacks

Inactive Publication Date: 2008-09-10
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As a result, although a computer is listed as a deregistered computer in the qualifying (latest) CRL, it is possible for the deregistered computer to use a deregistered public key that is not listed in the replaced old CRL to illegally Deliver digital products

Method used

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  • An encryption device, a decrypting device, a secret key generation device,a copyright protection system and a cipher communication device
  • An encryption device, a decrypting device, a secret key generation device,a copyright protection system and a cipher communication device
  • An encryption device, a decrypting device, a secret key generation device,a copyright protection system and a cipher communication device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0050] FIG. 1 is a functional block diagram showing the overall structure of a recording medium copyright protection system according to a first embodiment of the present invention.

[0051] The recording medium copyright protection system 1a is a system that records encrypted content on a DVD 2a as a recording medium, or reads encrypted content from the DVD 2a and decrypts it. The system includes an encryption device 100a that stores encrypted content on a DVD 2a; a decryption device 200a that reads encrypted content from the DVD 2a and decrypts it; and a terminal device 300 used by a certificate authority (CA) that issues a CRL, and the like.

[0052] The encryption device 100a includes two terminal devices, the terminal device 110a is used by a copyright protection licensor, and the terminal device 160 is used by a content manufacturer.

[0053] The decryption device 200a is, for example, an HD-DVD player capable of reproducing the content of HD (1125i / 750p) at the image le...

no. 2 example

[0108] Fig. 6 is an external view of the structure of a recording medium copyright protection system 1b according to the second embodiment. Since the constituent parts of the recording medium copyright protection system 1b corresponding to the constituent parts of the recording medium copyright protection system 1a of the first embodiment have the same reference numerals, they are omitted except for parts different from the recording medium copyright protection system 1a. illustrate.

[0109] In the terminal device 110a of the encryption device 100a according to the first embodiment, the exclusive OR unit 115 performs an exclusive OR operation between the CRL hash value Hash output from the hash function processing unit 114 and each device key. The encryption unit 116 encrypts the content key Kc using the exclusive OR value, and generates an encrypted content key ring. On the other hand, according to the terminal device 110b in the encryption device 100b of the second embodim...

no. 3 example

[0117] FIG. 7 is a functional block diagram of the overall structure of a recording medium copyright protection system 1c according to the third embodiment. In this figure, functional portions corresponding to the recording medium copyright protection system 1a of the first embodiment are not shown, and only portions specific to the recording medium copyright protection system 1c are shown.

[0118] The IC card 210a of the decryption device 200c according to the first embodiment simply transmits the obtained content key Kc to the descrambler 260b. In this way, it is impossible for the IC card 210a itself to know whether the obtained key is a qualified key capable of decrypting encrypted content. Therefore, it is desirable to check in advance whether or not the descrambler 260 has a correct value before transferring the obtained content key Kc to the descrambler 260b.

[0119] Therefore, the recording medium copyright protection system 1c according to the third embodiment is a...

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PUM

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Abstract

An encryption device, a decrypting device, a secret key generation device, a copyright protection system and a cipher communication device comprise: a CRL memory unit 111 that memorizes a CRL, a device key ring memory unit 112 that memorizes a peculiar device key KD A in every IC card 210a used in a decrypting device 200a, a content key memory unit 113 that memorizes a content key Kc which is a secret key for decrypting content, a hashing function processing unit 114 that calculates a hashing value of the CRL memorized in the CRL memory unit 111, an Ex-OR unit 115 that carries out an exclusive OR between the hashing value and the device key KD A memorized in the device key ring memory unit 112, and an Enc unit 116 that encrypts the content key Kc memorized in the content key memory unit 113 with an output value of an Ex-OR unit 115.

Description

[0001] This application is a divisional application of an application with a filing date of September 11, 2002, an application number of 02823585.1, and an invention title of "encryption device, decryption device, key generation device, copyright protection system, and encryption communication device". technical field [0002] The present invention relates to an encryption device and a decryption device for protecting copyrights when digital products are transmitted via recording media or transmission media. More particularly, the present invention relates to a technology for protecting against attacks by replacing a certificate revocation list (CRL) specifying a revoked public key certificate. technical background [0003] When a digital product is transferred from one (first) device to another (second) device, prior to the transfer, computer authentication is performed to avoid infringement of authorized acquired copyrights. The first computer wants to authenticate the sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/30H04L9/32H04L9/08G11B20/00
Inventor 大森基司馆林诚永井隆弘石原秀志
Owner PANASONIC CORP
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