高效的基于双线性对和身份的广义签密方案*

为解决目前基于身份的广义签密方案效率不高的问题，利用双线性对，结合广义的思想，提出了一个高效的基于身份的广义签密方案。在随机预言机模型下给出了该方案的安全性证明，证明结果表明该方案满足抗适应性选择密文攻击下的机密性、不可伪造性和不可否认性。与目前惟一的一个基于身份的广义签密方案相比，本方案减少了两个对运算，是目前效率最高的基于身份和对映射的广义签密方案。

Efficient pairing-based and identity-based generalized signcryption scheme

To improve the efficience, this paper proposed a new efficient identity-based generalized signcryption scheme using the bilinear pairings and the ideas of generalization. Proved the proposed scheme to be message confidentiality non-repudiation and unforgeability under the random oracle model. As compared with the only-one identity-based gernalized signcryption scheme to date,the proposed scheme decreases two pairing operations, and is more efficient.