一种完整的非对称公钥叛逆者追踪方案的密码学分析与改进

王青龙等人提出了一种完整的非对称公钥叛逆者追踪方案，并称该方案具有完善的撤销性和更高的传输效率等优点。对此进行详细分析发现它存在明显缺陷，提出一种攻击方案,使得叛逆者可以进行共谋攻击，但是管理者却无法使用黑盒叛逆者追踪方法对它们进行追踪。最后提出一种改进方案，在改进方案中，叛逆者虽然仍能实施上面提到的攻击，但是会被追踪者追踪到。

Cryptanalysis and improvement of complete asymmetric public-key traitor tracing scheme

A complete asymmetric public-key traitor tracing scheme was proposed by Wang Qing-long et al., which claimed that it had some advantages such as revoking unlimited traitors and higher transmission efficiency. The scheme and its obvious defect were carefully analyzed, and then a attack was given. And traitors can perform a collusion attack, but the manager can not trace the traitors by the black-box traitor tracing method. Finally, an improved scheme was proposed in which traitors still could play the above attack, but they can be traced.