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SUMMARY People are always concerned about privacy. Techniques tracing specific user activities may damage privacy seriously. To protect user privacy, a dynamic‐identity‐based remote user authentication scheme will be proposed in this manuscript. This scheme employs smart cards to achieve mutual authentication, and no verifier table is needed. Via this scheme, transmitted identities are always fresh such that untraceability is ensured, and a user can change his or her password after being authenticated successfully. Copyright © 2013 John Wiley & Sons, Ltd.

Wireless sensor networks are widely used for applications such as environmental monitoring, airport safety, health care, etc. For user authentication, in 2009, Das proposed a two-factor user authentication scheme in wireless sensor networks. They claimed that this scheme provided efficiency, strong security, and user anonymity property. However, we find that Das's scheme is still vulnerable to masquerade attack and cannot achieve user anonymity. This paper will propose an improvement to remedy the weakness of Das's scheme.

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