Computer Science – Cryptography and Security
Scientific paper
2005-06-30
Computer Science
Cryptography and Security
Scientific paper
Some protected password change protocols were proposed. However, the previous protocols were easily vulnerable to several attacks such as denial of service, password guessing, stolen-verifier and impersonation atacks etc. Recently, Chang et al. proposed a simple authenticated key agreement and protected password change protocol for enhancing the security and efficiency. In this paper, authors shall show that password guessing, denial of service and known-key attacks can work in their password change protocol. At the same time, authors shall propose a new password change protocol to withstand all the threats of security.
Mo Kun-Ru
Wang Ren-Chiun
Yang Chou-Chen
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