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ABSTRACT

This work presents a real-time frequency voice scrambler algorithm and its implementation in TMS 320C6X - TEXAS Instruments DSP (Digital Signal Processor) architecture. The voice channel cryptography system is based on a scrambled discrete Hartley Transform. It includes large energy random components inserted into the voice channel bandwidth. As result it is not possible to identify pauses between words, and it is also observed that the speaker could not be identified. The proposal uses low cost hardware architecture adapted for tactical level security in network voice communications.



KEYWORDS

Real-time algorithms, Cryptography, Digital signal processors, Discrete Hartley transforms, Fast transforms.

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THE INTERNATIONAL JOURNAL OF FORENSIC COMPUTER SCIENCE - IJoFCS

Volume 7, Number 1, pages 8-15, DOI: 10.5769/J201201001 or http://dx.doi.org/10.5769/J201201001


Frequency Speech Scrambler Based on the Hartley Transform and the Insertion of Random Frequency Components


By Francisco Nascimento, and Ricardo Toscano



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