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Wireless communication systems are often susceptible to the jamming attack where adversaries attempt to overpower transmitted signals by injecting a high level of noise. Jamming is difficult to mitigate in broadcast networks because transmitting and receiving are inherently symmetric operations: a user that possesses the key to decode a transmission can also use that key to jam the transmission. The authors describe a code tree system that provides input to the physical layer and helps the physical layer circumvent jammers. In their system, the transmitter has more information than any proper subset of receivers. Each receiver cooperates with the transmitter to detect any jamming that affects that receiver.
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