Date Added: May 2010
Ensuring communications security in Wireless Sensor Networks (WSNs) is very vital because the security protocols therein, should be devised to work at the link layer. Theoretically, any link layer security protocol must support three vital security attributes viz. Confidentiality, Message Integrity and Replay protection. However, in order to ensure lesser overhead, replay protection is often not incorporated as part of the link layer security framework. The authors argue here, that it is essential to implement replay protection at the link layer only and devise a simple scheme to do so. They first survey the common approaches to ensuring replay protection in conventional networks. They also implement the conventional algorithms for replay protection using the link layer framework for WSNs viz.