Toward Practical Code Designs for Covert Communication
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Hung, Sean
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Abstract
Covert communication concerns the situation in which legitimate parties want to hide the presence of communication from an external eavesdropper. Covert communications are governed by a "square root law," by which the code rate is required to vanish as the block length increases, posing challenges to code design as conventional linear codes do not apply. The proposed research identifies two ways to extend previous work on covert code design: A more general and flexible coding scheme, termed the hybrid scheme, and an explicit code for the additive white Gaussian noise (AWGN) channels. We show that the hybrid scheme enables simpler code design by using an additional but negligible amount of secret key. For explicit code design for AWGN channels, we extend a channel quantization technique, leading to an experimentally feasible design with a short block length compared to existing constructions.
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Date
2024-12-08
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Thesis (Masters Degree)