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    • 81. 发明授权
    • Copyright protection system, modular exponentiation operation apparatus, and modular exponentiation operation method
    • 版权保护制度,模幂运算装置和模幂运算法
    • US07925893B2
    • 2011-04-12
    • US10557723
    • 2004-05-24
    • Toshihisa NakanoAttrapadung NuttapongKazukuni KobaraHideki Imai
    • Toshihisa NakanoAttrapadung NuttapongKazukuni KobaraHideki Imai
    • G06F11/30G06F12/14
    • G11B20/00086G11B20/0021
    • A copyright protection system is provided that keeps manufacturing costs down regardless of the total number of playback apparatuses belonging to the system. In this system, a device key generating unit of a key management apparatus performs a modular exponentiation operation on a random number with an inverse element of a product of predetermined prime numbers, so as to generate and distribute device keys to playback apparatuses in one-to-one correspondence. A key revocation data generating unit generates, as key revocation data, information identifying the prime numbers used by an unrevoked playback apparatus to generate a decryption key from its device key and distributes the key revocation data along with an encrypted content to each playback apparatus. Playback apparatuses each attempt to generate a description key based on the key revocation data, and only those playback apparatuses that have successfully generated a decryption key are able to decrypt the encrypted content.
    • 提供了一种版权保护系统,其保持制造成本降低,而不管属于系统的回放装置的总数。 在该系统中,密钥管理装置的设备密钥生成单元对具有预定素数的乘积的逆元素的随机数执行模幂运算,以便将设备密钥生成并分发到重放设备 一个通信。 密钥吊销数据生成单元生成作为关键吊销数据的信息,识别由未被复原的重放装置使用的质数从其装置密钥生成解密密钥的信息,并将密钥吊销数据与加密的内容一起分发给每个重放装置。 回放装置各自尝试基于密钥吊销数据生成描述密钥,并且只有那些已经成功生成解密密钥的那些重放装置能够解密加密的内容。