Key Distribution Scheme for WSN Based on Hash Function

Aiming at the problems of large memory and communication cost,low security in typical key pre-distribution protocol,this paper presents a key pre-distribution scheme for Wireless Sensor Network(WSN) based on Hash function. It improves key security by advantage of one-way Hash function,and establishes key method by once broadcasting process to reduce the communication cost. Simulation results show that this scheme can reduce memory cost and decrease the communication cost from O(2N) to O(N),and improve resilience of node capture.