Abstract
The usage of implantable sensors is imperative in Body Sensor Network. The challenges associated with its security are open research problems. Implantable sensors need a set of secret keys to communicate with other sensors or entities. Secret key generation and subsequent key exchange with other sensors are significant power consuming tasks. Therefore, we propose a method based on pre-distribution of secret keys. The two major drawbacks, higher memory consumption and difficulties in the key refreshment of existing pre-distribution methods have been overcome in this paper. The key generation process has been shifted from implantable sensor to a trusted external device. The external device is paired with the sensor through inductive coupling and is used for powering the sensor and keys transfer. A variant of Diffie-Hellman key agreement with physiological values is used to facilitate secure transfer of keys. Formal security definitions of the proposed method have been presented.
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