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To defend against reconnaissance activity in adhoc wireless networks, we propose transmission power control as an effective mechanism for minimizing the eavesdropping risk. Our main contributions are as follows: First, we cast the w-th order eavesdropping risk as the maximum probability of packets being eavesdropped when there are w adversarial nodes in the network. Second, we derive the closed-form solution of the first order eavesdropping risk as a polynomial function of the normalized transmission radius. This derivation assumes a uniform distribution of user nodes. Then we generalize the model to allow arbitrary user nodes distribution and prove that the uniform user distribution minimizes the first order eavesdropping risk. This result plays an essential role in deriving analytical bounds for the eavesdropping risk given arbitrary user distributions. Our simulation results show that for a wide range of non-uniform traffic patterns, the difference of their eavesdropping risk values from the corresponding lower bounds is 3dB or less.
Wireless network security, transmission power control, wireless ad-hoc networks

J. Kao and R. Marculescu, "Minimizing Eavesdropping Risk by Transmission Power Control in Multihop Wireless Networks," in IEEE Transactions on Computers.
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