CPC H04W 12/037 (2021.01) [H03M 13/1102 (2013.01); H03M 13/353 (2013.01); H04L 1/0002 (2013.01); H04L 1/0054 (2013.01); H04L 1/0061 (2013.01); H04L 63/04 (2013.01); H04W 12/0431 (2021.01); H04W 84/12 (2013.01)] | 14 Claims |
1. A method for concealing information within error correction codes of adaptive rate wireless communication systems, the method comprising:
selecting a modulation and coding scheme with a more robust error correction capacity than needed by current channel conditions to increase a covert channel capacity of wireless communication systems;
encoding a hidden message with a pre-shared key that is known by a covert transmitter and a covert receiver; and
after a standard message is encoded by a transmitting station of the wireless communication systems, replacing codeword parity bits of codewords in the encoded standard message with the encoded hidden message at designated locations;
wherein before a receiving station of the wireless communication systems decodes the encoded standard message, a covert receiver:
extracts the embedded hidden message from the encoded standard message;
replaces bit values of the embedded hidden message with zero at the designated locations; and
decodes the extracted hidden message with the pre-shared key.
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