title: Cryptanalysis and security improvements of 'two-factor user authentication in wireless sensor networks'.
abstract: User authentication in wireless sensor networks (WSN) is a critical security issue due to their unattended and hostile deployment in the field. Since sensor nodes are equipped with limited computing power, storage, and communication modules; authenticating remote users in such resource-constrained environments is a paramount security concern. Recently, M.L. Das proposed a two-factor user authentication scheme in WSNs and claimed that his scheme is secure against different kinds of attack. However, in this paper, we show that the M.L. Das-scheme has some critical security pitfalls and cannot be recommended for real applications. We point out that in his scheme: users cannot change/update their passwords, it does not provide mutual authentication between gateway node and sensor node, and is vulnerable to gateway node bypassing attack and privileged-insider attack. To overcome the inherent security weaknesses of the M.L. Das-scheme, we propose improvements and security patches that attempt to fix the susceptibilities of his scheme. The proposed security improvements can be incorporated in the M.L. Das-scheme for achieving a more secure and robust two-factor user authentication in WSNs.
authors.affiliation: Center of Excellence in Information Assurance (CoEIA), King Saud University, Saudi Arabia. mkhurram@ksu.edu.sa
authors.forename: Muhammad Khurram
authors.initials: MK
authors.lastname: Khan
authors.forename: Khaled
authors.initials: K
authors.lastname: Alghathbar
mesh_terms: D056667:Biometric Identification; D016494:Computer Security; D006801:Humans; D058998:Remote Sensing Technology / Q000295:instrumentation* / Q000379:methods*