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Information steganography using backscatter radio

Topalis Athanasios

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Year 2019
Type of Item Diploma Work
Bibliographic Citation Athanasios Topalis, "Information steganography using backscatter radio", Diploma Work, School of Electrical and Computer Engineering, Technical University of Crete, Chania, Greece, 2019
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Recent advances in ambient, FM backscatter radio showed the feasibility ofpiggybacking an audio signal on top of a broadcast FM radio transmission.In conjunction with the weak transmission power inherent in backscatter ra-dio systems, this work exploits FM ambient backscatter to achieve covertcommunication. Information in the form of plain text is converted to a wide-band audio signal using Direct Sequence Spread Spectrum (DSSS) modula-tion, resulting in a noise-like audio signal undergoing Frequency Modulation(FM) before being backscattered to a conventional smart phone equippedwith FM radio, acting as the receiver. A Linear Feedback Shift Register(LFSR), provided with a key completely determining its output, generatesthe symbol sequences that serve as spreading sequences in DSSS, thus addinga Private-Key Encryption layer to enhance the cryptosystem's robustness. ARepetition Code is utilized as a way of error correction to increase the per-formance. Besides simulations, a prototype was implemented to verify thefeasibility of the proposed concept.

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