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Wireless Sensor Networks (WSN) have found applications in many areas including healthcare, military and behavior monitoring. However, due to various factors (e.g. use of a wireless channel, deployment in public and unattended areas), WSN applications are vulnerable to various attacks such as impersonation, replay, selective forwarding and sink hole. Therefore, security is an important issue to protect data in WSN. Several symmetric key based security schemes have been proposed in WSN for node authentication and secure data delivery. Most of the schemes are applicable for static WSN, where nodes once deployed, are not allowed to change their locations. However, depending on the application requirements, nodes in WSN may require to move from one place to another. The problem of authenticated pair-wise key update in dynamic WSN has not been addressed adequately in literature. In this …