Covert Messaging through TCP Timestamps [chapter]

John Giffin, Rachel Greenstadt, Peter Litwack, Richard Tibbetts
2003 Lecture Notes in Computer Science  
We present a protocol for sending data over a common class of low-bandwidth covert channels. Covert channels exist in most communications systems and allow individuals to communicate truly undetectably. However, covert channels are seldom used due to their complexity. Our protocol is both practical and secure against attack by powerful adversaries. We implement our protocol on a standard platform (Linux) exploiting a channel in a common communications system (TCP timestamps).
doi:10.1007/3-540-36467-6_15 fatcat:bkdotd4g6fa7zg76sgsu6ixgba