Cryptology ePrint Archive: Report 2004/298

Nominative Proxy Signature Schemes

Zuo-Wen Tan,Zhuo-Jun Liu

Abstract: In a nominative proxy signature scheme, an original singer delegates his signing power to a proxy, who generates a nominative signature on behalf of the original signer. In a nominative proxy signature scheme, only the nominee can verify the signature and if necessary, only the nominee can prove its validity to the third party. In this paper, we first classify the nominative proxy signature into two types, original-nominative proxy signature and proxy-nominative proxy signature. Then we analyze the nominative proxy scheme proposed by Park and Lee. We show that the scheme suffers from universal verification. We also point out that the scheme presented by S.-H. Seo and S.-H. Lee is insecure and the scheme cannot provide non-repudiation. Finally we present our nominative proxy signature schemes which overcome the weakness mentioned above. Compared with the scheme recently proposed by G.-L. Wang, our scheme is more efficient.

Category / Keywords: cryptographic protocols / digital signatures

Date: received 11 Nov 2004

Contact author: tanzyw at 163 com

Available format(s): PDF | BibTeX Citation

Version: 20041112:153057 (All versions of this report)

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