System and Method for Clock-Skew-Based Covert Communication

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Author
Knebel, Erik Sean
Tummala, Murali
McEachen, John C.
Date
2020-12-29Metadata
Show full item recordAbstract
A system and method for clock-skew-based covert communication
in which a message formed of message bits is
mapped to corresponding symbols having predetermined
clock skew values. For each corresponding symbol, an offset
value is calculated and added to each timestamp in a
predetermined quantity of outgoing TCP segments to generated
altered TCP segments, such that an artificial clock
skew is induced as measured by a receiver. A clock skew
value is determined from each predetermined quantity of
TCP segments and mapped to corresponding symbol. The
symbols are then mapped to corresponding message bits,
and the message is determined from the bits. In this way a
message can be sent from a transmitter to a receiver in a way
that is covert during transmission and deciphered at the
receiver.
Description
Patent
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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