发明名称 |
Controlling propagation of decryption keys |
摘要 |
A encryption key propagation control system is provided in which a generation number (72) is identified with each decryption key and the generation number is queried each time a request is made to forward a decryption key to another user. The generation number is decremented at each request, and once it reaches a zero further requests are refused by the system.
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申请公布号 |
GB2378539(A) |
申请公布日期 |
2003.02.12 |
申请号 |
GB20010021502 |
申请日期 |
2001.09.05 |
申请人 |
* DATA ENCRYPTION SYSTEMS LIMITED |
发明人 |
DAVID ROBIN * TOMLINSON |
分类号 |
G06F1/00;G06F12/14;G06F21/00;H04L9/08;H04L9/10;H04L9/32;(IPC1-7):G06F1/00 |
主分类号 |
G06F1/00 |
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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