Information security was first explored in the context of communication systems. When two

entities send or receive sensitive data using public networks or communication channels that are

easily accessible by could-be attackers, they should generally provide the basic security

functions such as data confidentiality, data integrity, and peer authentication. Confidentiality,

integrity, and authentication services are critical to preventing an adversary from compromising

the security of a distributed sensor network. Key management is likewise critical to establishing

the keys necessary to provide this protection.