A New key management scheme in heterogeneouswireless Sensornetworks

Wireless Sensor Networks (WSN) are used in manyapplications like battlefields, patient monitoring, emergenceresponse information and environmentalmonitoring. Toachieve security in WSN, it is important to be able to encryptthe messages sent between sensor nodes. It is required to agreeupon a common key before encrypting the messages. The keymanagement task is challenging due to resource constrainednature of WSN. In this paper, we are proposing a new treebased key management scheme which is based on BLOM keydistribution scheme forheterogeneous sensor networks. Theproposed scheme handles, various events like node addition,node compromise and key refresh at regular intervals