Abstract: Now a days inWireless Sensor Network, when user wants to access the data at sensor node atthat time user should be authorized. There are many malicious users in network.In previous systems, there are chances of many network attacks like nodecapture, stolen smart card attack, sensor node spoofing attack, stolen verifierattack, and fails to ensure backward secrecy. To overcome these attacks and toprevent our sensor, sensor data, and Network from malicious users, we proposeda secure, efficient, flexible Authentication Scheme for WSN.
Keywords – Ad hoc wireless sensor network, Smart card, ForwardSecrecy, Oracles.