Cryptology ePrint Archive: Report 2008/337

Modified Huang-Wang's Convertible Nominative Signature Scheme

Wei Zhao and Dingfeng Ye

Abstract: At ACISP 2004, Huang and Wang first introduced the concept of convertible nominative signatures and also proposed a concrete scheme. However, it was pointed out by many works that Huang-Wang's scheme is in fact not a nominative signature. In this paper, we first present a security model for convertible nominative signatures. The properties of Unforgeability, Invisibility, Non-impersonation and Non-repudiation in the setting of convertible nominative signatures are defined formally. Then we modify Huang-Wang's scheme into a secure one. Formal proofs are provided to show that the modified Huang-Wang's scheme satisfies all the security properties under some conventional assumptions in the random oracle model.

Category / Keywords: public-key cryptography / digital signatures, anonymity

Publication Info: This paper is the full version of the paper that will be published in TurstCom2008.

Date: received 3 Aug 2008

Contact author: wzh at is ac cn

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Version: 20080811:065159 (All versions of this report)

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