可快速撤销代理权的指定验证人代理签名

摘要

指定验证人的代理签名是一种只有指定的验证人才能验证签名有效性的签名技术，在电子商务等领域有着广泛的应用，迄今为止已有多个基于该签名技术的代理签名方案被提出。但是这些方案在代理权的撤销方面都有着各种各样的缺陷，如不能实时撤销、需要一个可信的第三方等。提出一个指定验证人代理签名方案，方案利用验证人产生的时间戳和原始签名人维护的撤销列表，实现了无需可信第三方就能使得原始签名人在任何时候可以实时地撤销代理委托。分析表明本方案能够满足指定验证人代理签名方案的安全需求并有着较高的效率。%Designated-verifier proxy signature is a signature technology that the effectiveness of the signature can only be verified by the designated-verifier.It has been widely used in the fields of E-commerce and others, and there are a couple of proxy signature schemes based on it being proposed up to now .However all of these schemes have various kinds of defects in proxy right revocations , e.g., cannot be timely revoked, and needs a trusted third party , etc.In this paper, we propose a novel designated verifier proxy signature scheme .The scheme realises that the original signer can timely revoke the proxy delegations at anytime without a trusted third party by utilising the time -stamp produced by the verifier and the revocation list maintained by the original signer .Analysis shows that this scheme satisfies the security requirement of the designated-verifier proxy signature scheme and is efficient as well .