Title page for ETD etd-07072011-183310
|Type of Document
|Author's Email Address
||Secure Distributed Detection in Bandwidth-Constrained Wireless Sensor Networks
||Master of Science (M.S.)
||Electrical & Computer Engineering
- decentralized detection
- information security
- decision fusion
|Date of Defense
Utilizing wireless sensor network (WSN) is a novel idea in a variety of applications. However, the limited resources allocated to the sensor nodes make the design of WSNs a
challenging problem. We consider the problem of hypothesis testing in a bandwidth-constrained, low-power wireless sensor network operating over insecure links. Sensors
quantize their observations and transmit their decisions to an intended (ally) fusion center
(AFC) which combines the received messages to detect the state of an unknown hypothesis.
In many applications the sensor messages are vulnerable to unauthorized eavesdropping.
The scarce bandwidth and processing power for the sensors rule out the utilization of advanced encryption techniques. To protect their transmissions from an unauthorized (third
party) fusion center (TPFC), the sensors use a simple encryption whereby they randomly
flip their quantization outcomes, similarly to what happens in a discrete memoryless channel. It is assumed that AFC is aware of the encryption probabilities (keys) but TPFC is
For the AFC the decision rule is formulated as a constrained optimization problem where
one constraint is a lower bound on the error probability of TPFC. The optimal decision
rules for the two fusion centers are then derived. It is shown that by appropriate design of
the encryption probabilities and the AFC decision rule, it is possible to degrade the error
probability of the TPFC significantly and still achieve very low probability of error for the
AFC. Numerical results are presented to show that it is possible to ensure that TPFC does
not gain any information from the observation of sensors transmissions.
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