发明名称 |
METHOD FOR DISTRIBUTING SCRAMBLED DIGITAL DATA DECRYPTION KEYS |
摘要 |
The invention concerns a method for distributing individual decryption keys for decrypting scrambled digital data transmitted by a broadcasting system to a plurality of terminals connected to a data exchange network (2), said broadcasting system comprising a portal (14) designed to provide the individual keys, at least a scrambling platform (16) and at least a server (6) for broadcasting the scrambled data. The invention is characterized in that said method comprises the following steps: breaking down the scrambling period of the transmitted data into a series of crypto-periods CPi each defining a validity duration of an individual key Ki, and each time a terminal (4) is connected to the portal (14), in delivering to said terminal (4) a set of individual keys comprising at least a key corresponding to the crypto-period CPi and at least a key corresponding to the crypto-period CPi+1 and the date of a subsequent connection for recovering a set of decryption keys corresponding at least to a subsequent crypto-period if continued access is granted.
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申请公布号 |
WO03049442(A1) |
申请公布日期 |
2003.06.12 |
申请号 |
WO2002FR04150 |
申请日期 |
2002.12.03 |
申请人 |
FRANCE TELECOM;CODET, ANDRE;FEVRIER, PIERRE;FONTAINE, NOEL |
发明人 |
CODET, ANDRE;FEVRIER, PIERRE;FONTAINE, NOEL |
分类号 |
H04L9/08;H04N7/16;H04N7/167;H04N7/173;(IPC1-7):H04N7/167 |
主分类号 |
H04L9/08 |
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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