Cryptanalysis of Password Authenticated Key Exchange Based on RSA for Imbalanced Wireless Networks

Eun-Jun YOON
Kee-Young YOO

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.6    pp.2627-2628
Publication Date: 2005/06/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.6.2627
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fundamental Theories for Communications
key exchange,  password,  guessing attack,  wireless network,  

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Recently, Yeh et al. proposed an improvement on Zhu et al.'s password based authenticated key exchange protocol based on RSA, in order to make the protocol withstand undetectable on-line password guessing attacks and also to provide explicit key authentication. The improved scheme, however, is still susceptible to off-line password guessing attacks. Accordingly, the current letter demonstrates the vulnerability of Yeh et al.'s scheme regarding off-line password guessing attacks.