Novel Two Factor User Authentication Scheme over WSNs

Wireless sensor networks (WSNs) have found their way into a wide variety of applications and systems with vastly varying requirements and characteristics. User authentication in WSNs is a critical security issue due to their unattended and hostile deployment. Recently, Khan and Alghathbar proposed an improved two-factor user authentication (K–A scheme) in WSNs. This paper shows that the K–A scheme is still weak against the user impersonate attack and the password guessing attack and propose a novel two-factor user authentication scheme to fix the susceptibilities to the previous scheme. The proposed scheme could support more security and robustness than the K–A scheme in WSNs.