An Improved Nominative Proxy Signature for Mobile Communication

Jianhong ZHANG  Qianhong WU  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E88-D   No.7   pp.1697-1699
Publication Date: 2005/07/01
Online ISSN: 
DOI: 10.1093/ietisy/e88-d.7.1697
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Application Information Security
Keyword: 
nominative proxy signature,  security analysis,  improved scheme,  

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Summary: 
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.