An Improvement of a Deniable Authentication Protocol

Bin-Tsan HSIEH
Hung-Min SUN

IEICE TRANSACTIONS on Communications   Vol.E87-B    No.10    pp.3099-3101
Publication Date: 2004/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Network
cryptanalysis,  authentication,  protocol,  

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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.