公开追踪和CCA2安全的叛逆者追踪方案

Public Traceable Traitor Tracing Scheme Secure against CCA2

提出一种新的k-resilient公钥叛逆者追踪方案。方案的追踪方式为公开黑盒追踪。假设DDH问题为困难问题,则方案能被证明是自适应选择密文攻击安全的,并且在撤销不超过k个叛逆者条件下仍然是自适应选择密文攻击安全的。与同类方案相比,该方案没有使用一次性消息认证码假设,并且有效降低了追踪时的计算复杂性。另外,方案满足非对称性。

A new k-resilient public-key traitor tracing scheme was proposed.A traitor in this scheme can be traced by the way of public black-box tracing mean.Meanwhile,our scheme is provably secure against adaptive chosen ciphertext attack assume that DDH problem is difficulty.Our scheme remains CCA2-secure when not more thanktraitors are re-voked.Compared with similar schemes,our scheme does not use one-time message authentication code assumption and reduces the tracing complexity greatly.Further,our scheme satisfies asymmetry.