具有时效的Chameleon签名方案的设计与分析

Design and analysis of Chameleon signature scheme with time limit

基于Chameleon签名理论,提出具有时效的Chameleon签名方案,为需要指定签名接收者,且对签名时效有一定要求的签名问题提供了解决途径。该方案保证在时效期限内,只有指定的接收者能够验证签名的有效性;超过时效期限后,签名转换为普通签名,并且签名转换的决定权不再限于签名者,任何人都可以核实监督甚至强制要求签名者按时转换签名。该方案设计简单、易于实现,而且在签名效率与安全性等方面都优于现有的可转换Chameleon签名方案。

A new Chameleon signature scheme with time limit is proposed based on Chameleon signature. A good way is offered to solve the problem of signature with an appointed recipient and time limit, Before the time limit expires, the signature is validated in the scheme only by the appointed recipient. After the time limit passes, the signature is converted into a conventional digital signature and is publicly validated. Furthermore, anyone can verify whether the signature is converted on time, This scheme is simply designed and easily implemented. And its signature efficiency and security are better than existing convertible Chameleon schemes＇.