发明名称 |
System and method for protecting data files by periodically refreshing a decryption key |
摘要 |
Methods for transferring among key holders in encoding and cryptographic systems the right to decode and decrypt messages in a way that does not explicitly reveal decoding and decrypting keys used and the original messages. Such methods are more secure and more efficient than typical re-encoding and re-encryption schemes, and are useful in developing such applications as document distribution and long-term file protection.
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申请公布号 |
US6937726(B1) |
申请公布日期 |
2005.08.30 |
申请号 |
US19990468747 |
申请日期 |
1999.12.21 |
申请人 |
CONTENTGUARD HOLDINGS, INC. |
发明人 |
WANG XIN |
分类号 |
H04L9/08;H04L9/30;(IPC1-7):H04L9/00;H04K1/00 |
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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