标准模型下可证安全的本地验证者撤销群签名方案

摘要

本地验证者撤销是一种有效的群成员撤销方法,该方法只需将撤销信息发给验证者而无需签名者的参与.目前大部分本地验证者撤销群签名方案都是在随机预言模型下证明方案的安全性,但是这种理想的预言机在现实世界中是不存在的,构造标准模型下可证安全的群签名方案仍是当前研究的热点课题.本文在Boyen- Waters群签名方案的基础上,提出一个本地验证者撤销群签名方案,并在标准模型下证明了方案的安全性.分析了方案的性能,在满足AES80比特标准安全条件下,方案在签名元素个数、签名长度方面优于现有标准模型下本地验证者撤销群签名方案.%An efficient approach of member revocation in group signature is verifier-local revocation. In this approach,revocation messages are only sent to signature verifiers, while signers have no involvement. However,mostly provably secure group signature relied on the random oracle model that are out of reach in the real world, the designing of provably secure group signature in the standard model is also a hot topic of research in modern cryptography.Based on Boyen-Waters group signature scheme,we propose a group signature scheme with verifier-local revocation, which is proven to be secure in the standard model.The performance of the proposed scheme is analyzed; under the condition of 80-bit AES, our scheme is superior to the existing verifier-local revocation group signatures in the standard model both in the number of signature elements and the length of signature.