发明申请
- 专利标题： Encryption device a decrypting device a secret key generation device a copyright protection system and a cipher communication device
- 专利标题（中）： 加密装置，解密装置，密钥生成装置，版权保护系统和密码通信装置
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申请号： US10490346申请日： 2002-09-11
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公开(公告)号： US20050021941A1公开(公告)日： 2005-01-27
- 发明人: Motoji Ohmori , Makoto Tatabayashi , Takahiro Nagai , Hideshi Ishihara
- 申请人： Motoji Ohmori , Makoto Tatabayashi , Takahiro Nagai , Hideshi Ishihara
- 优先权： JP2001-298414 20010927; JP2001-374856 20011207
- 国际申请： PCT/JP02/09245 WO 20020911
- 主分类号： G11B20/00
- IPC分类号： G11B20/00 ; H04L9/08 ; H04L9/14 ; H04L9/32 ; H04L9/00
摘要：
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.