Faults and Improvements of an Enhanced Remote User Authentication Scheme Using Smart Cards

Details Faults and Improvements of an Enhanced Remote User Authentication Scheme Using Smart Cards Faults and Improvements of an Enhanced Remote User Authentication Scheme Using Smart Cards

2005-01-29

arxiv.org/abs/cs/0501087v1

Computer Science

Cryptography and Security

5 pages

Scientific paper

In 2000, Hwang and Li proposed a remote user authentication scheme using smart cards to solve the problems of Lamport scheme. Later, Chan- Chang, Shen- Lin- Hwang and then Chang-Hwang pointed out some attacks on Hwang – Li’s scheme. In 2003, Shen, Lin and Hwang also proposed a modified scheme to remove these attacks. In the same year, Leung-Cheng-Fong-Chan showed that modified scheme proposed by Shen-Lin-Hwang is still insecure. In 2004, Awasthi and Lal enhanced Shen-Lin-Hwang’s scheme to overcome its security pitfalls. This paper analyses that the user U/smart card does not provide complete information for the execution and proper running of the login phase of the Awasthi- Lal’s scheme. Furthermore, this paper also modifies the Awasthi- Lal’s scheme for the proper functioning.

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