签密是在一个逻辑步骤内同时实现认证和加密的一种新密码技术,其效率远远高于先签名后加密的传统方法。然而一般签密方案不能像传统方法那样同时具有前向安全性和公开可验证性两个重要密码学性质。对Zheng最初签密方案的效率和安全性进行了分析,并针对其存在的两个缺点进行了改进,使之同时具有前向安全性和公开可验证性。最后基于ECC给出了一种新的同时具有前向安全性和公开可验证性的签密方案。
Signcryption is a new cryptographic technique which simultaneously provides both confidentiality and authenticity.Its efficiency is much higher than that of the traditional signature-then-encryption method.But signcryption schemes cannot provide forward secrecy and public verifiability as the traditional method does.This paper analyzed Zheng's original signcryption scheme.And proposed a new signcryption schemes with forward secrecy and public verifiability.Finally,gave a signcryption scheme based on ECC cryptography,which had forward secrecy and public verifiability.