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A Public-Key Traitor Tracing Scheme with Revocation Using Dynamic Shares

机译:具有使用动态共享的吊销的公钥叛逃者跟踪方案

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We proposed a new public-key traitor tracing scheme with revocation capability using dynamic shares and entity revocation techniques. Our scheme's traitor tracing and revocation programs cohere tightly. The size of the enabling block of our scheme is independent of the number of receivers. Each receiver holds one decryption key only. The distinct feature of our scheme is that when traitors are found, we can revoke their private keys (up to some threshold z) without updating the private keys of other receivers. In particular, no revocation messages are broadcast and all receivers do nothing. Previously proposed revocation schemes need update existing keys and entail large amount of broadcast messages. Our traitor tracing algorithm works in a black-box way. It is conceptually simple and fully k-resilient, that is, it can find all traitors if the number of them is k or less. The encryption algorithm of our scheme is semantically secure assuming that the decisional Diffie-Hellman problem is hard.
机译:我们使用动态份额和实体撤销技术提出了一种具有撤销功能的新的公钥叛徒追踪方案。我们计划的叛徒追踪和撤销计划紧密结合。我们方案的使能块的大小与接收器的数量无关。每个接收者仅持有一个解密密钥。我们方案的独特之处在于,当发现叛徒时,我们可以撤消其私钥(达到某个阈值z),而无需更新其他接收者的私钥。特别是,不会广播任何撤销消息,并且所有接收者都不会执行任何操作。先前提出的吊销方案需要更新现有密钥并需要大量广播消息。我们的叛徒追踪算法以黑盒方式工作。它在概念上很简单,并且具有完全的k弹性,也就是说,如果叛逆者的数量等于或小于k,则可以找到所有叛徒。假设决策Diffie-Hellman问题很困难,我们的方案的加密算法在语义上是安全的。

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