基于证书授权和基于身份的代理签名方案

基于因数分解困难问题假设,构造了一个新的基于证书授权的代理鉴名方案和基于身份的代理签名方案.新方案具有强不可伪造性、强不可否认性、可区分性、可验证性、原始签名者和代理签名者的身份真实性以及代理签名权的可撤消性等特点,弥补了现存的许多代理签名方案中不含有原始签名人和代理签名人的身份信息这一缺点,解决了原始签名者在线问题.新方案具有算法简单、效率高等特点,能够抵抗对代理签名方案的已知攻击,可以方便地应用于分布计算、移动代理以及电子商务和电子政务系统中.

Delegation-by-Certificate Based and ID-Based Proxy Signature Schemes

A delegation-by-certificate proxy signature scheme and an ID-based proxy signature scheme are proposed under assumption of a factorization problem.The new schemes have such desirable features as strong un-forgeability and non-repudiation,distinguishability,verifiability,identity confirmation of original and proxy signers,and revocability of the proxy signature delegation.The ID-based proxy signature scheme overcomes the limitation of some existing schemes that do not include ID information of signer and proxy signers.The proposed schemes allow online signature of the original signer,and are simple and efficient,and capable of resisting existing attacks.These schemes can be used in distributed computing,mobile agent,e-commerce and e-government systems.