发明授权
US07925025B2 Method for broadcast encryption and key revocation of stateless receivers
有权
无状态接收机的广播加密和密钥撤销方法
- 专利标题： Method for broadcast encryption and key revocation of stateless receivers
- 专利标题（中）： 无状态接收机的广播加密和密钥撤销方法
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申请号： US12061084申请日： 2008-04-02
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公开(公告)号： US07925025B2公开(公告)日： 2011-04-12
- 发明人: Jeffrey Bruce Lotspiech , Dalit Naor , Simeon Naor
- 申请人： Jeffrey Bruce Lotspiech , Dalit Naor , Simeon Naor
- 申请人地址： US NY Armonk
- 专利权人： International Business Machines Corporation
- 当前专利权人： International Business Machines Corporation
- 当前专利权人地址： US NY Armonk
- 代理商 John L. Rogitz
- 主分类号： H04L9/00
- IPC分类号： H04L9/00 ; H04L9/08 ; G06F7/04 ; H04N7/16
摘要：
A tree is used to partition stateless receivers in a broadcast content encryption system into subsets. Two different methods of partitioning are disclosed. When a set of revoked receivers is identified, the revoked receivers define a relatively small cover of the non-revoked receivers by disjoint subsets. Subset keys associated with the subsets are then used to encrypt a session key that in turn is used to encrypt the broadcast content. Only non-revoked receivers can decrypt the session key and, hence, the content.