发明名称 |
METHOD TO MANAGE REVOCATIONS IN A GROUP OF TERMINALS |
摘要 |
The present invention concerns the field of broadcast encryption method, i.e. a method to organize the distribution of keys into a group of users so that it is possible to manage the revocation of one member of the group in an efficient way. The proposed solution is a private encryption key ciphertext constant collusion- resistant broadcast encryption. The main idea behind the invention is to mix the notion of efficient tree-based key derivation (also called subset management) with individual and personalized key blinding thus achieving a full collusion-resistant broadcast encryption system. The key de-blinding is performed at the last moment thanks to a cryptographic technique called pairings (also known as bilinear maps) resulting in a global key commonly shared by all authorized (non-revoked) devices. It should be noted that only non-revoked devices can compute the final key (this is achieved through subset management and related subset key derivation technique) and perform the de-blinding (which is performed with one pairing). |
申请公布号 |
WO2011107451(A1) |
申请公布日期 |
2011.09.09 |
申请号 |
WO2011EP52974 |
申请日期 |
2011.03.01 |
申请人 |
NAGRAVISION S.A.;KARLOV, ALEXANDRE |
发明人 |
KARLOV, ALEXANDRE |
分类号 |
H04L9/08;G06F21/10;G11B20/00;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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