...Covert channels aim to hide the very existence of communication by using means of communication not normally intended to be used.
The Covert Channels Evaluation Framework (CCHEF) is a flexible software framework for empirically evaluating network steganography methods or covert channels in network protocols. CCHEF can be used in real networks with real overt traffic (e.g in research testbeds), but can also simulate covert channels using overt traffic from trace files (e.g. evaluation on a single host).
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