earticle

영어

In Wireless Sensor Networks (WSNs), these sensor nodes cooperate with each other to
form a network without using any infrastructure. WSNs has a wide application. But the
security of WSNs is still an important issue. Some existing approaches mainly rely on
cryptography to ensure data authentication and integrity. These approaches only address
part of the problem of security in WSNs. However, these approaches are not sufficient for the
unique characteristics and novel misbehaviors encountered in WSNs. Recently, the use of
reputation systems has become an important mechanism in WSNs. In this paper we propose a
reputation and trust mathematical framework for WSNs which borrows tools from probability,
statistics and mathematics analysis. We have suggested a new term certainty used in trust
system and we argued that the positive or negative outcomes for a certain event is not enough
information to make a decision in WSNs. We build up a reputation space and trust space in
WSNs, and define a transformation from reputation space to trust space. Finally, we discuss
some important properties of them and provide a basement in the trust and reputation for
future research in WSNs. And we point out some open problems in reputation and trust
system in WSNs.