A secret permutation of the second chirp sequence in AFDM is proposed as a physical-layer security key, with security argued from factorial search-space size and derangement-based guessing probabilities.
Security and privacy for 6G: A survey on prospective technologies and challenges,
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Chirp-Permuted AFDM for Quantum-Resilient Physical-Layer Secure Communications
A secret permutation of the second chirp sequence in AFDM is proposed as a physical-layer security key, with security argued from factorial search-space size and derangement-based guessing probabilities.