A Public-key Traitor Tracing Scheme Based on Identity
Zhang Bing-ru · Journal of Qinghai Normal University · 2012
Traitor tracing schemes are used to fight piracy when distributing securely some data to multiple authorized receivers.By traitor tracing schemes,at least one authorized user will be found sharing their decryption keys to unauthorized users.A new public-key traitor tracing scheme is presented in this paper Based on identity.The main contribution of this scheme is that 1)Both the number of keys stored by a user and the length of broadcasted block data are independent of the number of users.(2)Full collusion resistance: no users can construct a different valid decryption key from themselves by coalition.(3)Full revoke: any selected users can be revoked without renewing their decryption keys.(4)Full recoverability :any revoked users can be recovered without renewing their decryption keys.(5) This scheme is un-symmetry secret-key(6)The security of this scheme is based on the difficult problems of solving discrete logarithm problem and decision DDH.