4. Generalization
The implementation of a covert channel relies on two distinct issues: on the one hand, the information transport vector, and on the other, the way in which the information is encoded. In this section, we focus on both aspects.
4.1 A vehicle for communication
In the context of networks, there are usually two ways of constructing a covert channel:
use "neglected" data;
modify a field used by the protocol.
In , the authors review...
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