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Covert channels are mechanisms for communicating information in
ways that are difficult to detect. Data exfiltration can be an
indication that a computer has been compromised by an attacker
even when other intrusion detection schemes have failed to detect
a successful attack. Covert timing channels use packet
inter-arrival times, not header or payload embedded information,
to encode covert messages. This paper investigates the channel
capacity of Internet-based timing channels and proposes a
methodology for detecting covert timing channels based on how
close a source comes to achieving that channel capacity. A
statistical approach is then used for the special case of binary
This revision differs from the original only in the correction of one
Bibliographic citation for this report: [plain text] [BIB] [BibTeX] [Refer]
Or copy and paste:
Vincent Berk, Annarita Giani, and George Cybenko, "Detection of Covert Channel Encoding in Network Packet Delays." Dartmouth Computer Science Technical Report TR2005-536, August 2005.
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