机构地区: 空军工程大学信息与导航学院
出 处: 《计算机工程与应用》 2006年第21期103-105,共3页
摘 要: 签密是实现认证加密的一种新的密码技术,其效率远远高于传统“先签名再加密”认证加密方法。然而签密方案不能像传统方法那样同时提供前向安全性和可公开验证性。论文对两个重要签密方案Zheng的签密方案和SK签密方案进行了改进,给出了两个同时具有前向安全性和可公开验证性的签密方案。在改进方案中验证不需要接收者的私钥,传输中隐藏签密的承诺值,使得到发送者私钥的攻击者不可能得到本次及以前通信者的秘密信息。通过这些方法实现了可公开验证性和前向安全性。 Signcryption,as a new cryptographic technique,its efficiency is much higher than that of the traditional method "signature-then-encryption".But signcryption schemes cannot provide forward secrecy and public verifiability as the traditional method does.For this reason,two important signcryption schemes,Zheng's scheme and SK's scheme are improved.As a result,two public verifiable signcryption schemes with forward secrecy are proposed.In the improved schemes,the verification process don't need the sender's private key,and the committee values are hided in transmission,so attacks who obtain the sender's private key can not get any secret information between these participates before this communication.By these methods the improved schemes achieve public verifiability and forward security simultaneity.