Cryptology ePrint Archive: Report 2005/466

Cryptanalysis of the Yang -Wang's password authentication schemes

Jue-Sam Chou and Ming-De Yang and Guey-Chuen Lee

Abstract: In 1999, Yang and shieh proposed two password authentication schemes using smart cards. But in 2003, Sun and Yeh indicated that their schemes are subject to the forgery attack. So in 2005, Yang and Wang proposed an improvement of Yang and Shieh¡¦s schemes to resist against Sun and Yeh¡¦s attack. However in this paper, we will point out that Yang and Wang¡¦s schemes still suffer from the forgery attack. Because in their schemes, one can masquerade as a legal user and cheat the remote server successfully in the authentication phase.

Category / Keywords: cryptographic protocols / smart cards

Publication Info: not be duplicates of work published previously or scheduled to be published in peer-reviewed publications

Date: received 23 Dec 2005

Contact author: jschou at mail nhu edu tw ; g3141012@mail2 nhu edu tw

Available format(s): PDF | BibTeX Citation

Version: 20051231:150849 (All versions of this report)

Short URL:

Discussion forum: Show discussion | Start new discussion

[ Cryptology ePrint archive ]