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This work proposes a jamming-resistant frequency hopping (FH) system that utilizes local channel observations for secret key generation (SKG). FH is a spread spectrum technique used in both military and consumer wireless applications to avoid jamming attacks, but requires pre-shared secret keys among communicating terminals, say Alice and Bob, to ensure that the same FH sequence is used at both sides...
This paper studies a simple decode-and-forward (DF) relay network in the presence of a jammer. The jammer is able to send noise-like signals to interfere with the signal reception at both the relay and the destination. From the attacker's point of view, we investigate the following two design problems: i) What is the optimal probability distribution of the random jamming signals? ii) Given a total...
Multirelay networks exploit spatial diversity by transmitting user's messages through multiple relay paths. Most works in the literature on cooperative or relay networks assume that all terminals are fully cooperative and neglect the effect of possibly existing malicious relay behaviors. In this work, we consider a multirelay network that consists of both cooperative and malicious relays, and aims...
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