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Weaknesses and Improvements of Yang–Chang–Hwang’s Password Authentication Scheme
Volume 16, Issue 2 (2005), pp. 203–212
Wei-Chi Ku   Hao-Chuan Tsai  

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https://doi.org/10.15388/Informatica.2005.094
Pub. online: 5 August 2022      Type: Research Article      Open accessOpen Access

Received
1 May 2004
Published
5 August 2022

Abstract

In 2001, Tseng, Jan, and Chien proposed an improved version of Peyravian–Zunic’s password authentication scheme based on the Diffie–Hellman scheme. Later, Yang, Chang, and Hwang demonstrated that Tseng–Jan–Chien’s scheme is vulnerable to a modification attack, and then described an improved scheme. In this paper, we show that Yang–Chang–Hwang’s scheme is still vulnerable to a denial-of-service attack and a stolen-verifier attack. In addition, we also propose an improved scheme with better security.

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© 2005 Institute of Mathematics and Informatics, Vilnius
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Open access article under the CC BY license.

Keywords
password authentication denial-of-service attack stolen-verifier attack

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INFORMATICA

  • Online ISSN: 1822-8844
  • Print ISSN: 0868-4952
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