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| A Collusion-Resistant Asymmetric Public-Key Traitor Tracing Scheme
for Multi-channel Services |
| Zhang Xue-jun①; Yu Guo-lin②; Zhou Li-hua① |
①Ministry of Edu. Key Lab. of Computer Network and Info. Security, Xidian Univ., Xi’an 710071, China;
②The Second Northwest Institute Ethnic Minority, Yinchuan 750021, China |
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Abstract A new traitor tracing scheme is proposed , whose essential idea is the session key S is divided into a sum of S1 and S2. Based on DL(discrete logarithm)problem, S1 is decrypted by introducing a multi-channel service parameter and a special polynomial function, S2 is decrypted by Chinese Remainder Theorem. The new scheme has many advantages such as multi-service, collusion-resistance, asymmetry, long-lived subscriber’s key and black-box tracing. It is proved to be semantically secure under the DDH (Diffie-Hellman Problem) assumption and its whole capabilities are much better than that of the existing ones.
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Received: 14 April 2005
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2006, Vol. 28 
