一种新的面向多服务抗共谋非对称叛逆者追踪方案

为了更好地保护数据提供商和合法用户的实际利益，以及给合法用户提供多种服务，将会话密钥S分解成S1与S2之和，在大整数分解困难问题的条件下，构造特殊等式来解密S1（方案1）。在离散对数困难问题的条件下，利用不经意多项式估值协议（OPE）和拉格朗日插值多项式来解密S2（方案2）。在两种方案组合的基础上形成一种新的叛逆者追踪方案。新方案具有多服务性、抗共谋、非对称性、黑盒子追踪、前向安全性和后向安全性等优点，综合性能好于现有方案

A New Multi-service Oriented Collusion-resistant Asymmetric Traitor Tracing Scheme

To protect the profit of DS(Data Supplier) and authorized users better and provide multiple services for users,a new multi-service oriented collusion-resistant asymmetric traitor tracing scheme was proposed,in which the session key S was divided into a sum of S_1 and S_2.Under the condition of large integer factoring problem,S_1 was decrypted by constructing a special equation(scheme 1).Under the condition of discrete logarithm problem,S_2 was decrypted by OPE(Oblivious Polynomial Evaluation) protocol and Lagrange Interpolation Polynomial(scheme 2).On the basis of the combination of the scheme 1 and scheme 2,a new traitor tracing scheme was formed.The new scheme has many advantages such as multi-service,collusion-resistance,asymmetry,black-box tracing,forward-security and backward-security,and its whole capabilities is also better than existing ones.