Comments on YEH-SHEN-HWANG's One-Time Password Authentication Scheme

Il-Sun YOU  Kyungsan CHO  

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.2    pp.751-753
Publication Date: 2005/02/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.2.751
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
authentication,  S/KEY,  one-time password,  smart card,  

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Recently, Yeh, Shen and Hwang proposed an one-time password authentication scheme, which enhances the S/KEY scheme to resist server spoofing attacks, preplay attacks and off-line dictionary attacks. In this letter, the weaknesses and inconveniences of their scheme are demonstrated.