高效安全的基于身份的部分盲签名方案

Efficient and secure ID-based partially blind signature scheme

部分盲签名允许签名者在盲签名中明确地嵌入预先协商好的公共信息而不失盲性,它克服了完全盲签名和受限盲签名的缺点。对于目前基于身份的部分盲签名方案中普遍存在效率及安全性不高的问题,提出了一个新的高效安全的基于身份的部分盲签名方案。通过利用选择目标计算性Diffie-Hellman假设和有效地使用预计算,使得方案不仅在随机预言机模型下对自适应选择消息和身份攻击具有不可伪造性,而且降低了总的计算复杂度。与现有的随机预言模型下基于身份的部分盲签名方案比较,所提方案效率最高,比Chow方案(CHOW S,HUI L,YIU S.Two improved partially blind signature schemes from bilinear pairings[C]//Proceedings of ACISP'05.Berlin:Springer-Verlag,2005:316-328.)和何方案(何俊杰,孙芳,祁传达.基于身份部分盲签名方案的分析与改进[J].计算机应用,2013,33(3):762-765.),计算效率分别提高约64.1%和13.2%。因此,该方案能够提高电子投票、电子现金等系统的效率和安全性。

Partially blind signature allows a signer to explicitly embed a pre-agreed common information into a blind signature without the loss of blindness property. It overcomes the defects of the completely blind signature and the limited blind signature. For the problem of low efficiency and security common in present ID-based partially blind signature schemes, a new efficient and secure ID-based partially blind signature scheme was proposed. Utilizing the Chosen-Target Accompanied Computational Diffie-Hellman （CT-ACDH） assumption and effective precomputation, not only made the scheme possess the unforgeability for adapting chosen-message and identity attacks in the random oracle model, but also reduced the whole computational complexity. Compared with the existing ID-based partially blind signature schemes in the random oracle model, the proposed scheme has the best efficiency, and compared with the Chow＇s scheme （ CHOW S, HUI L, YIU S. Two improved partially blind signature schemes from bilinear pairings[ C]//Proceedings of ACISP＇05. Bedim Springer-Vedag, 2005：316 - 328. ） and He＇s one（ HE J, SUN F, QI C. Cryptanalysis and improvement of ID-based partially blind signature scheme[ J]. Journal of Computer Applications, 2013, 33（3） ： 762 -765. ）, the computational efficiency is increased by about 64.1% and 13.2% respectively. Hence, the scheme can enhance the efficiency and safety of electronic voting and electronic cash systems, etc.