Abstract
Designing
cost-efficient, secure network protocols for Wireless Sensor Networks (WSNs) is
a challenging problem because sensors are resource-limited wireless devices.
Since the communication cost is the most dominant factor in a sensor’s energy
consumption, I introduce an Efficient Keying Management Scheme for WSNs that
significantly reduces the number of transmissions needed for re-keying to avoid
stale keys.
It is
able to efficiently detect and filter false data injected into the network by
malicious outsiders. This framework consists of two operational modes each of
which is optimal for different scenarios. In Mode-I, each node monitors its
one-hop neighbors where Mode -II statistically monitors downstream nodes. I have evaluated Efficient Keying Management Scheme’s feasibility and performance analytically
and through simulations. Our results show that , without incurring transmission
overhead is able to eliminate malicious data from the network in an energy
efficient manner.The key to the RC4 encryption
mechanism dynamically changes as a function of the residual virtual energy of
the sensor. Thus, a one-time dynamic key is employed for one packet only and
different keys are used for the successive packets of the stream.
The intermediate nodes along the path to the
sink are able to verify the authenticity and integrity of the incoming packets
using a predicted value of the key generated by the sender’s virtual energy,
thus requiring no need for specific re-keying messages.
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