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Comments on two multi-server authentication protocols

Authors:
Yalin Chen
Jue-Sam Chou
Chun-Hui Huang
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URL: http://eprint.iacr.org/2008/544
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Abstract: Recently, Tsai and Liao et al. each proposed a multi-server authentication protocol. They claimed their protocols are secure and can withstand various attacks. But we found some security loopholes in each protocol. We will show the attacks on their schemes.
BibTeX
@misc{eprint-2008-18123,
  title={Comments on two multi-server authentication protocols},
  booktitle={IACR Eprint archive},
  keywords={cryptographic protocols / multi-server, password authentication protocol, server spoofing attack, parallel session attack},
  url={http://eprint.iacr.org/2008/544},
  note={ d949702@oz.nthu.edu.tw 14242 received 28 Dec 2008},
  author={Yalin Chen and Jue-Sam Chou and Chun-Hui Huang},
  year=2008
}