International Journal of Network Security
Wireless Sensor Networks (WSNs) consist of many small sensor nodes and are commonly used to collect data and monitor hostile environments. Due to the factor of the cost, sensor nodes are lack of tamper-resistance and are deployed in unattended environments. Sensor nodes are easily captured by an intruder and compromised. An intruder will extract the secret elements in the sensor nodes including the group key. If an intruder knows the group key, the author can use the group key to break down the wireless sensor network.