Abstract
Peyravian and Jeffries proposed a secure remote user access over insecure network in 2006. Shortly after, Munila and Peinada gave an off-line password-guessing attack to Peyravian-Jeffries's remote user authentication protocol. In the same time, Shim also presented a security flaws of remote user access over insecure network based on Peyravian-Jeffries scheme. In 2008, Holbl et al. proposed an improvement of Peyravian-Jeffries's user authentication protocol and password change protocol based on their finding which it immune against the attack. In this paper, we propose a method different from the previous attacks, the method is based on the mutually exclusive or among the fundamental problems in the computer system.
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