发明名称 |
CONDITIONAL ACCESS SYSTEM AND METHOD FOR PREVENTION OF REPLAY ATTACKS |
摘要 |
In a conditional access system, a headend transmits content to one or more receivers in encrypted transport streams. The system provides a multi-layer security architecture, rendering the system resistant to key replay attacks; if one layer is circumvented, subsequent layers remain intact. A first layer prevents unencrypted keys from being recorded by shielding the unencrypted keys from users and encrypting the path from the receiver's conditional access module to the transport decryption module; a second layer prevents a key recorded on one receiver from being played back to the transport decryption module on a second receiver; a third layer prevents a user from decrypting transport streams without the encryption module by encrypting the stream a second time prior to being passed through any user-accessible memory or processor. Events tables are transmitted with the transport stream, either unencrypted for immediate use or encrypted, to prevent unauthorized use.
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申请公布号 |
WO0165762(A3) |
申请公布日期 |
2002.05.10 |
申请号 |
WO2001US06911 |
申请日期 |
2001.03.02 |
申请人 |
TIVO, INC.;PLATT, DAVID, C.;GOODMAN, ANDREW;ZENCHELSKY, DANIEL |
发明人 |
PLATT, DAVID, C.;GOODMAN, ANDREW;ZENCHELSKY, DANIEL |
分类号 |
H04N5/76;H04L29/06;H04M11/08;H04N5/44;H04N5/445;H04N5/782;H04N5/913;H04N7/025;H04N7/03;H04N7/035;H04N7/16;H04N7/167;H04N7/173;H04Q9/00;(IPC1-7):H04N7/167;H04N5/00;H04L9/08 |
主分类号 |
H04N5/76 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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