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An Improved Nominative Proxy Signature for Mobile Communication
Jianhong ZHANG Qianhong WU
IEICE TRANSACTIONS on Information and Systems
Publication Date: 2005/07/01
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Application Information Security
nominative proxy signature, security analysis, improved scheme,
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As a specific signature, the nominative proxy signature scheme is a method in which the designated proxy signer generates a nominative signature and transmits it to a verifier, instead of the original signer. Recently, Seo et al. proposed a nominative proxy signature scheme for mobile communication and claimed that the scheme hash non-repudiation. However, after analyzing the scheme, we show that the scheme is insecure and cannot provide non-repudiation, note that a malicious original signer can forge the proxy signer to sign on any message. Finally, we also present a modification version of the scheme to repair the security flaw.