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Encryption is not sufficient to secure communication because often the simple fact that communication exists is often enough to raise suspicion and take further actions. 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).
CCHEF is designed for evaluating covert channels and not for (mis)using them for actual covert communication. CCHEF's sender or receiver are normal user space applications that are not disguised in any way and do not contain any malware-like code, e.g. they do not illegally acquire superuser privileges etc.
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