Navy

Covert communications method

System for hiding and finding data throughout layers in the transmission stack

Communications

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Steganography is the concealment of messages or data within non-secret messages and may go by terms such as covert channel communications or embedded communications. Digital communications present ample opportunity for sending information via secret communications. These methods include chaffing and winnowing and the exploitation of covert channels used in the layers of the TCP/IP network model. The method of chaffing and winnowing provides for the transmission of digital message traffic along with an appropriate message authentication code (MAC), which may be added by various mechanisms within the network model. Transmitted along with the desired message and its correct MAC are a large number of other messages, each with an incorrect MAC, preventing eavesdroppers from ascertaining which message is the correct one. Covert channels throughout the communications stack can and have been exploited, but regardless of where the covert data is placed, each previous schema has failed to provide means for handling errors within the covert data and methods for retransmissions.

Naval scientists and engineers have developed a covert data transmission scheme appropriate for use over the Internet which employs optimal performance characteristics including throughput, error detection and correction, and maintenance of quality of the real data and the embedded data. The system reliably avoids exposure of the embedded data by casual observers. The system uses checksum values inserted into the transmission and a comparison calculation on the receiving end to determine if the data arrived intact.

This US patent 8,443,101 is a divisional of US patent 7,725,595.

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Yes
Yes
Sublicensing Royalty on Net Sales
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3%
4%
Sublicensing Royalty on Other Income
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50%
50%

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