Cryptanalysis of Yeh-Shen-Hwang's One-Time Password Authentication Scheme

Dae Hyun YUM
Pil Joong LEE

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.4    pp.1647-1648
Publication Date: 2005/04/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.4.1647
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
cryptanalysis,  one-time password,  S/KEY,  authentication scheme,  

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Yeh, Shen, and Hwang recently proposed a secure one-time password authentication scheme using smart cards. They modified the famous S/KEY scheme to achieve security against preplay attacks and off-line dictionary attacks. However, this article shows that their scheme is vulnerable to preplay attacks.