Cryptanalysis of two collusion-resistant traitor tracing schemes
Xuejun Zhang · Journal of Northwest Normal University · 2008
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.