发明名称 |
Method of generating a cryptographic transformation, tamper resistant device using the same, and methods of using the device |
摘要 |
To prevent piracy, audiovisual content is encrypted prior to transmission to consumers. A low-cost, high-security cryptographic rights module (such as a smartcard) enables devices such as players/displays to decode such content. Security-critical functions may be performed by the cryptographic module in a manner that allows security compromises to be addressed by upgrading or replacing cryptographic modules, thereby avoiding the need to replace or modify other (typically much higher-cost) components. The security module contains cryptographic keys, which it uses to process rights enablement messages (REMs) and key derivation messages (KDMs). From a REM and KDM, the security module derives key data corresponding to content, uses public key and/or symmetric cryptography to re-encrypt the derived key data for another device, and provides the re-encrypted key data to the decoding device. The decoding device then uses cryptographic values derived from the re-encrypted key data to decrypt the content. |
申请公布号 |
EP1208667(A1) |
申请公布日期 |
2002.05.29 |
申请号 |
EP20000930764 |
申请日期 |
2000.05.16 |
申请人 |
CRYPTOGRAPHY RESEARCH INC. |
发明人 |
KOCHER, PAUL, C.;JAFFE, JOSHUA, M.;JUN, BENJAMIN, C. |
分类号 |
G06F12/14;G06F1/00;G06F21/00;G06F21/24;G06K19/07;H04L9/10;H04L9/24;H04L9/32 |
主分类号 |
G06F12/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|