一个可证安全的高效的代理盲签名方案

代理盲签名结合了代理签名和盲签名的优点,在电子商务等领域有着广阔的应用前景。目前大多数代理盲签名的安全性是启发式分析,没有形式化证明,并且大多没有考虑多一伪造攻击。提出了一个新型的代理盲签名安全模型,并在该模型下提出了一个基于双线性对的代理盲签名方案,并在随机预言机模型下,证明了其在选择消息/授权文件攻击下是不可伪造的,其安全性可分别规约为CDH问题和Chosen-Target CDH问题。分析表明,该方案满足代理盲签名的主要安全要求,而且和已有的方案相比,本方案更加高效。

An efficient and provably secure proxy blind signature scheme

By combining the advantages of blind signatures with proxy signatures, a proxy blind signature can be widely applied in many fields, such as e commerce. Currently, most of the proposed proxy blind signature schemes only give some heuristic explanations without formal proof, and one more forgery is seldom considered in many schemes. In the paper, we propose a novel efficient security model and a proxy blind signature scheme based on bilinear parings. The scheme is unforgeable against adaptive chosen message/warrant attacks under the Computational Diffie Hellman assumption and Chosen Target Computational Diffie Hellman assumption in the random oracle model. The analysis shows that the proposed scheme can satisfy the main secure properties of a proxy blind signature. Furthermore, the scheme is more efficient than traditional ones.