关键词: 叛逆者追踪, 密码学分析, 抗共谋, 共谋攻击

Abstract: 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.

Key words: traitor tracing, cryptanalysis, collusion-resistant, collusion attack