Pair-wise key update in Wireless Sensor Networks based on reputation model

Many applications in Wireless Sensor Networks (WSNs) are, to a great extent, determined by networks security. But the security technology only based on encryption can not solve the new malicious behaviors because encryption technology can not effectively prevent attacks from internal opponents or error service from nodes. A pair-wise key update scheme in WSNs based on reputation model is proposed. The services including pair-wise key update, revocation and establishment when a new node joins based trust degree have been realized in the scheme. The reputation distribution of the sensor nodes is described with β-distribution and the statistical expectation of reputation distribution is proposed to express the trust value of nodes. They not only resist the attacks from outside nodes but also prevent attacks or malicious behaviors from internal nodes. The scheme has good scalability which support dynamic key management and distributed key establishment and update among the nodes.