常数签名长度的高效基于属性签名协议设计

作为一种新的密码学工具,基于属性的签名方案使得用户可以使用其属性信息作为公钥进行签名而无需证书绑定.该签名随后可被验证满足特定的访问控制结构,同时不会暴露用户的具体身份和属性信息.上述性质使得基于属性的签名在有效保护用户隐私的同时,实现了基于属性的访问控制,因此得到了许多关注.在本文中,我们对当前基于属性签名方案的效率进行了改进,提出了一个可以实现常数签名长度的门限式基于属性签名方案,并在随机预言机模型下对方案的安全性进行了证明.与现有方案相比,本方案在保持其它参数长度可实用的情况下,缩短了签名长度,提高了通信效率.

Efficient attribute-based signature with constant signature size

As a new cryptographic tool, attribute-based signature(ABS) allows user to sign messages using his attributes. The signature could be verified to satisfy some predicate without exposing any particular attributes or identity information of the signer. These properties effectively protect user's privacy while achieving attribute-based access control. In this paper, we propose an efficient threshold attribute-based signature scheme with constant signature size and constant pairing computation during verification. The scheme has been proved to be unforgeable and unconditionally anonymous. Compared with other existing constant-size ABS schemes, our scheme is short in signature size while keeps the secret key size acceptable.