ENCRYPTION APPARATUS, DECRYPTION APPARATUS, SECRET KEY GENERATION APPARATUS, AND COPYRIGHT PROTECTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an encryption apparatus which is capable of presenting a high cost performance ratio and safely transferring a digital literary work.

SOLUTION: The encryption apparatus 100a comprises: a CRL storage unit 111 that stores a CRL; a device key ring storage unit 112 that stores a device key KD_A specific to each copyright protection module 210a used by a decryption apparatus 200a; a content key storage unit 113 that stores a content key Kc that is a secret key for encrypting a content; a hashing function processing unit 114 that calculates a hash value of the CRL stored in the CRL storage unit 111 according to a hashing function; an Ex-OR unit 115 that obtains an exclusive OR value between the hash value and the device key KD_A; and an Enc unit 116 that encrypts the content key Kc using an output value from the Ex-OR unit 115, and stores the hash value, the encrypted content key and the encrypted contents in a DVD 2a.

COPYRIGHT: (C)2005,JPO&NCIPI