基于EIGamal加密算法的匿名叛逆者追踪方案

基于离散对数的EIGamal加密算法体制，提出一种匿名的叛逆者追踪方案。在此方案中，广播信息通过对称加密算法加密后广播给用户，而加密使用的会话密钥是在注册用户通过匿名身份验证后，通过数据提供商发送的数据头传送给用户。由性能分析可知，该方案不仅具有用户的匿名安全性、可撤销性与可恢复性的特点，还能够抵抗线性组合攻击。

Anonymous Traitor Tracing Scheme Based on EIGamal Encryption Algorithm

Based on the cryptosystem of EIGamal， an anonymous traitor tracing scheme is presented in this paper. In the scheme， information use symmetric encryption and is broadcasted to legitimate users， and the session key is sent to users through the header produced by data supplier after register users has been tested and verified. The analysis of performance show that the scheme not only has many advantages， such as anonymous safety of users， non repudiation， full frameproof， revocability， recoverability， but also is able to achieve anti linear attack.