发明名称 |
System for traceable decryption of bandwidth-efficient broadcast of encrypted messages and security module revocation method used for securing broadcasted messages |
摘要 |
The present invention makes use of techniques such as those described by Boneh and Franklin to allow for the realization of a pseudo-asymmetric encryption scheme whereby one public encryption corresponds to a plurality of private decryption keys. This scheme therefore provides a solution to the problem of inefficient use of bandwidth in asymmetrical encryption schemes which inherently require that a plurality of encryptions of data be broadcast to a plurality of receivers. The invention further ensures that the advantage of traceability, typical found in asymmetric encryption schemes, is maintained due to the characteristic that each receiver uses a unique traceable decryption key. The traceability thus achieved by the present invention allows for the revocation of a security module which has been involved in the abusive use of conditional access data, particularly by means of clones of security modules whose security has been compromised.
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申请公布号 |
US8548167(B2) |
申请公布日期 |
2013.10.01 |
申请号 |
US20090382354 |
申请日期 |
2009.03.13 |
申请人 |
JUNOD PASCAL;KARLOV ALEXANDRE;FISCHER NICOLAS;NAGRAVISION S.A. |
发明人 |
JUNOD PASCAL;KARLOV ALEXANDRE;FISCHER NICOLAS |
分类号 |
H04N7/167;H04L9/08;H04L9/20 |
主分类号 |
H04N7/167 |
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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