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Security of Kuwakado-Tanaka Transitive Signature Scheme for Directed Trees
Xun YI Chik-How TAN Eiji OKAMOTO
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/04/01
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Information Security
cryptography, transitive signature, forgery attack,
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Recently, Kuwakado and Tanaka proposed a transitive signature scheme for directed trees. In this letter, we show that Kuwakado-Tanaka scheme is insecure against a forgery attack, in which an attacker is able to forge edge signatures by composing edge signatures provided by a signer.