Date Added: Jun 2011
As sensor networks edge closer toward widespread deployment, security issues have became a central concern and are increasingly important. In fact, sensor networks cannot be used in practice if they are not secure, for example, in applications like emergency rescue and battlefield communication; if no security mechanism is used, an adversary can easily thwart the network establishment. Symmetric key systems are still the major tools for communication privacy and data authenticity in most networks. To provide secure communication for any group of nodes using symmetric key cryptography, these nodes need to share a common secret key.