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Polyglots and Chimeras in Digital Radio Modes

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Polyglots and Chimeras in Digital Radio Modes
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Featuring Practical Matryoshka Protocols for a 21st Century Numbers Station
Alternative Title
A Protocol for Leibowitz
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7
Number of Parts
18
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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Abstract
Ah Matryoshkas, who doesn't like these Russian nesting dolls? But why should the fun of chimeric nesting be limited to just application formats? It is possible to design PHY-layer digital modulation protocols that (1) are backward compatible with existing standards and (2) discretely contain additional information for reception by those who know the right tricks. When properly designed, these polyglot protocols look and sound much like the older protocols, causing an eavesdropping Eve to believe she has sniffed the contents of a transmission when in fact a second, hidden message is hitching a ride on the transmission. Mallory, on the other hand, may use these protocols-in-protocols to smuggle long Russian stories to all who will listen! This fine technical lecture by two neighborly gentlemen describes techniques for designing polyglot modulation protocols, as well as concrete examples of such protocols that are fit for use in international shortwave radio communication.