Cryptology ePrint Archive: Report 2004/050

Yet another attack on a password authentication scheme based on quadratic residues with parameters unknown 1

Lizhen Yang, Xiaoyun Wang, Dong Zheng, Kefei Chen

Abstract: In 1988, Harn, Laih and Huang proposed a password authentication scheme based on quadratic residues. However, in 1995, Chang, Wu and Laih pointed out that if the parameters d b a , , and l are known by the intruder, this scheme can be broken. In this paper, we presented another attack on the Harn-Laih-Huang scheme. In our attack, it doesn’t need to know the parameters and it is more efficient than the Chang-Wu-Laih attack.

Category / Keywords: cryptographic protocols / cryptanalysis, authentication, password

Publication Info: unpublicized

Date: received 21 Feb 2004

Contact author: yang-lz at cs sjtu edu cn

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Version: 20040221:213809 (All versions of this report)

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