Cryptology ePrint Archive: Report 2005/182

Cryptanalysis on Chang-Yang-Hwang Protected Password Change Protocol

Chih-I Wang, Chun-I Fan, and D. J. Guan

Abstract: Recently, Chang et al. proposed an authenticated key agreement and protected password change scheme. They claimed that their scheme is simple and efficient. However, in this letter we point out that their protected password change protocol is insecure under the denial-of-service attack and the dictionary attack in some situations.

Category / Keywords: Authentication, Passwords, Information security, Cryptography

Date: received 16 Jun 2005

Contact author: wangzy at isl cse nsysu edu tw

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Version: 20050622:214439 (All versions of this report)

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