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An Improvement of a Deniable Authentication Protocol
IEICE TRANSACTIONS on Communications
Publication Date: 2004/10/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
cryptanalysis, authentication, protocol,
Full Text: PDF(67.2KB)>>
A deniable authentication protocol is used to identify the source of a received message for a receiver, but the receiver is unable to prove to a third party the source of the received message. Recently, Fan et al. proposed a deniable authentication protocol based on Diffie-Hellman algorithm. In this paper, we show that Fan et al.'s protocol does not possess the deniable property as they claimed. A cheating receiver can prove the source of the received message to a third party. In addition, we also present a modification of Fan et al.'s protocol to overcome the security flaw.