两个抗共谋叛逆者追踪方案的密码学分析

王青龙等人提出了一种免共谋公钥叛逆者追踪方案,并称该方案具有抗共谋和更高的传输效率等优点.对此方案进行详细分析,发现它存在明显缺陷,提出了一种攻击方案,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进行追踪.王青龙等人还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.对这个方案进行分析后发现它也存在明显缺陷,亦提出一种攻击方案,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进行追踪.

Cryptanalysis of two collusion-resistant traitor tracing schemes

Wang Qing-long et al proposed a collusion-free public-key traitor tracing scheme, which claimed that it had some advantages such as collusion-resistant and higher transmission efficiency. This paper carefully analyzed the scheme and found obvious defect, then gave a attack, and traitors can perform a collusion attack, but the manager can not trace the traitors by the black-box traitor tracing method. Wang Qing-long et al proposed a complete asymmetric public-key traitor tracing scheme, which claimed that it had some advantages such as revoking unlimited traitors and higher transmission efficiency. This paper carefully analyzed the scheme and found obvious defect, then gave a attack, and traitors can perform a collusion attack, but the manager can not trace the traitors by the black-box traitor tracing method.