高效的无证书签密方案

无证书的密码体制不但消除了传统公钥密码体制中的证书管理问题，而且解决了基于身份密码体制中的密钥泄露问题。签密方案结合了公钥加密和数字签名的功能，能够同时实现消息的机密性和认证性。提出一种新的无证书签密方案，新方案在签密过程中需要1次配对运算，在解签密过程中仅需要3次配对运算。与已有的方案相比，新方案具备更高的效率。在安全性方面，新方案满足机密性、不可伪造性和可公开验证性。

Efficient certificateless signcryption scheme

Certificateless cryptography not only overcomes the certificate management problems in the traditional public key cryptosystems, but also solves the key escrow problems in identity-based cryptosystems.Signcryption scheme combines the functionality of public key encryption and digital signature, which can realize the confidentiality and unforgeability of message simultaneously.This paper presents an efficient certificateless signcryption scheme,which only requires one pairing operation in the signcryption phase and three pairing operations in the unsigncryption phase.With comparison to the existing schemes,the efficiency of the scheme is better.For security requirements,this new scheme satisfies confidentiality,unforgeability and public verifiability.