Key management in Wireless Sensor Networks (WSNs) is an important issue due to the absence
of trusted infrastructures, on one hand, and the limited resources of sensor nodes, on the other
hand. This paper surveys some recent key management approach
es in WSNs. It first identifies
some of the problems that confront the key management. Then, it defines some criteria for
viable solutions to key management problems. Next, it explores some of the proposed key
management approaches, and analyzes them according to the presented criteria. Some open
research issues are discussed.
