Improved Hidden Identity-based Signature Scheme
In Financial Cryptography 2007, Kiayias and Zhou introduced a novel concept of Hidden identity-based signatures (abbreviated as Hidden-IBS) by adapting the traditional notion of group signatures. Compared with existing group signature schemes, Hidden-IBS is more desirable in some applications, such as identity-information management systems and anonymous credential systems. At the same time, Kiayias and Zhou firstly proposed the Hidden-IBS from bilinear pairings. Unfortunately, the Kjayias-Zhou scheme fails to achieve exculpability and CCA2-anonymity, which are commonly agreed properties for group signature scheme and Hidden-IBS. In this paper, an improved Hidden-IBS is proposed by employing the techniques of the Sigma-compiler for concurrent zero knowledge argument and a variant of Cramer-Shoup encryption based on the linear assumption. The new scheme enjoys the advantages of strengthened security, concurrent join and desirable properties in performance, especially in the signature length. Moreover, in order to alleviate the expensive pairing operations of the verifier, an efficient batch verification algorithm is also provided.
group signatures hidden identity-based signatures concurrent join exculpability CCA2-anonymity
Liu Xin Xu Qiu-liang
School of Computer Science and Technology Shandong University Department of Information Engineering School of Computer Science and Technology Shandong University Jinan, China
国际会议
厦门
英文
416-421
2010-10-29（万方平台首次上网日期，不代表论文的发表时间）