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Hybrid Double Layered Security against Data Corruption and Node Compromise Attacks In WSN

K R Remesh Babu, Geethu K Mohan, Philip Samuel

Wireless Sensor Network (WSN) is a collection of sensors that are of heterogeneous in nature. Data sensed from the environment are traversed through the network till it reaches the sink. The main focused problem of Wireless Sensor Network is the data integrity throughout the network. If the data is corrupted, considerable amount of energy is wasted at each time when the data is forwarded to the next node. The critical data corruption attack is done by compromised nodes. Various strategies have been introduced to identify the corrupted data and compromised node. This paper focuses a hybrid double layered security strategy for sensed data. The first step of security is applied by appending a Keyed Message Authentication Code (HMAC) to the sensed data by Secure Hash Algorithm (SHA-2/512) which is robust algorithm to ensure message security throughout the network. The second step of security is implemented by a modified form of ConstrAined Random Perturbation based pairwise keY (CARPY+) mechanism. In CARPY+ mechanism guaranteed key exchange between sender and receiver proves the sender nodes identity. Any fail while comparing the key which is extracted from the received message identifies the sender node as a malicious node. The proposed methodology improves the network performance by avoiding data corruption at the network layer and same time identifies the compromised nodes.