发明名称 |
Conditional access control |
摘要 |
The invention relates to a secure data processing system including an unscrambling module [DSC] disposed on a dedicated hardware part [HW] of an integrated circuit and intended to unscramble a stream of data [SP] scrambled according to a scrambling key, a module [CM] for calculating an unscrambling key [Kp] disposed on said dedicated hardware part [HW] and intended to manipulate data under the control of a so-called calculation program stored on said dedicated hardware part [HW], a processor [CPU] for in particular controlling the functioning of the unscrambling [DSC] and calculation [CM] modules. Said system also includes a read only memory [SME] disposed on said dedicated hardware part [HW] for storing a secret key [Kp]. Said calculation program includes instructions for prompting said calculation module [CM] to use said secret key [L] and at least one data item [AC[n,p] or Kpc)] coming from outside the secure data processing system, in order to calculate an unscrambling key [Kp]. The unscrambling is enabled only if the unscrambling key [Kp] corresponds to the scrambling key. |
申请公布号 |
US2005152545(A1) |
申请公布日期 |
2005.07.14 |
申请号 |
US20040507808 |
申请日期 |
2004.09.14 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
DESMICHT ERIC;MUTZ STEPHANE;TISON CHRISTOPHE |
分类号 |
G06F21/24;H04L9/10;H04N7/16;H04N7/167;(IPC1-7):H04N7/167 |
主分类号 |
G06F21/24 |
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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