摘要： 对现有基于身份的部分盲签名方案进行安全性分析,发现大多方案存在公共协商信息可被篡改的漏洞,即攻击者可以在不被察觉的情况下将盲化的消息乘以部分盲因子,从而消除掉方案中的部分盲特性,同时可以伪造签名中的公共协商信息。为此,提出一种改进的部分盲签名方案,以解决基于身份的部分盲签名方案中公共协商信息被伪造的问题。分析方案的部分盲性和不可伪造性,证明其满足部分盲性。在随机预言机模型下,改进方案对适应性选择消息和身份攻击是不可伪造的,与现有基于身份的部分盲签名方案相比,具有更高的效率。

关键词: 部分盲签名, 基于身份, 随机预言机模型, 双线性对, 伪造

Abstract: The security of the existing ID-based partial blind signature scheme proposed is analyzed.Most schemes with the loophole that public consultations vulnerability information can be tampered with,the adversary can get rid of the partial blind property of the signature without being detected by multiplying the reverse of the partial blind factor to the blind message,and the adversary can forge the public consultations vulnerability information in the signature.To cope with the problem that the consultation public information may be forged in some schemes,it presents a modified ID-based partial blind signature scheme.Partially blind and unforgeable of the modified scheme are analyzed,and it proves that new scheme has partial blindness.The modified scheme has adaptive chosen ID and ciphertext security in the random oracle model,and has more efficiency than the previous partial blind signature schemes.

Key words: partially blind signature, ID-based, random oracle model, bilinear pairing, forgery

中图分类号: 

• TP301