The Password Change Phase is Still Insecure
Manoj Kumar

TL;DR
This paper critically examines the security of the password change phase in a recent smart card-based remote authentication scheme, revealing that it remains vulnerable despite previous modifications.
Contribution
It provides an in-depth analysis showing that the password change phase in Yoon et al.'s scheme is still insecure, highlighting ongoing security challenges.
Findings
The password change phase is vulnerable to attacks.
Previous modifications did not fully address security flaws.
The scheme remains insecure despite improvements.
Abstract
In 2004, W. C. Ku and S. M. Chen proposed an efficient remote user authentication scheme using smart cards to solve the security problems of Chien et al.'s scheme. Recently, Hsu and Yoon et al. pointed out the security weaknesses of the Ku and Chen's scheme Furthermore, Yoon et al. also proposed a new efficient remote user authentication scheme using smart cards. Yoon et al. also modified the password change phase of Ku and Chen's scheme. This paper analyzes that password change phase of Yoon et al's modified scheme is still insecure.
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Taxonomy
TopicsAdvanced Authentication Protocols Security · User Authentication and Security Systems · Cryptography and Data Security
