发明名称 |
TRACEABLE METHOD AND SYSTEM FOR ENCRYPTING AND/OR DECRYPTING DATA, AND RECORDING MEDIA THEREFOR |
摘要 |
The invention concerns a traceable method for encrypting and/or decrypting data broadcast by at least one transmitter towards several decoders wherein: during encryption of broadcast data, the transmitter implements (in 86) at least one first secret function to transform an unencrypted message into an encrypted message; and during decryption of said broadcast data, all the decoders implement (in 92) at least one common second secret function, each decoder using therefor a mathematical description of the second function stored in a memory (21), the mathematical description of said second function being different from one decoder to another or from one group of decoders to another such that the mathematical description used identifies exclusively the particular decoder or group of decoders. |
申请公布号 |
WO2005008951(A2) |
申请公布日期 |
2005.01.27 |
申请号 |
WO2004FR01362 |
申请日期 |
2004.06.02 |
申请人 |
FRANCE TELECOM;ARDITTI MODIANO, DAVID;BILLET, OLIVIER;GILBERT, HENRI |
发明人 |
ARDITTI MODIANO, DAVID;BILLET, OLIVIER;GILBERT, HENRI |
分类号 |
H04L9/06;H04L9/08;H04L9/30 |
主分类号 |
H04L9/06 |
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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