A new simple authenticated key agreement and protected password change protocol

Authors:
Eun-Jun Yoon;Kee-Young Yoo
Affiliations:
Department of Computer Engineering, Kyungpook National University, Daegu, South Korea;Department of Computer Engineering, Kyungpook National University, Daegu, South Korea
Venue:
EUC'05 Proceedings of the 2005 international conference on Embedded and Ubiquitous Computing
Year:
2005

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Abstract

In 2005, Chang et al. proposed a simple authenticated key agreement and protected password change protocol. However, Chang et al.’s schemes are still susceptible to stolen-verifier attack and Denial-of-Service attacks. Accordingly, the current paper demonstrates the vulnerability of Chang et al.’s schemes to two simple attacks and then presents an improved scheme to resolve such problems. In contrast to Chang et al.’s protected password change protocol, the proposed protected password change protocol can securely update user passwords without a complicated process, while also providing greater security.