Papers › Adaptive Warden Strategy for Countering Network Covert Storage Channels
Adaptive Warden Strategy for Countering Network Covert Storage Channels
Mehdi Chourib, Steffen Wendzel, Wojciech Mazurczyk
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The detection and elimination of covert channels are performed by a network node, known as a warden. Especially if faced with adaptive covert communication parties, a regular warden equipped with a static set of normalization rules is ineffective compared to a dynamic warden. However, dynamic wardens rely on periodically changing rule sets and have their own limitations, since they do not consider traffic specifics. We propose a novel adaptive warden strategy, capable of selecting active normalization rules by taking into account the characteristics of the observed network traffic. Our goal is to disturb the covert channel and provoke the covert peers to expose themselves more by increasing the number of packets required to perform a successful covert data transfer. Our evaluation revealed that the adaptive warden has better efficiency and effectiveness when compared to the dynamic warden because of its adaptive selection of normalization rules.
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