Hunting Shadows: Towards Packet Runtime-based Detection Of Computational Intensive Reversible Covert Channels
Tobias Schmidbauer, Steffen Wendzel · 2021
The appearance of novel ideas for network covert channels leads to an urge for developing new detection approaches. One of these new ideas are reversible network covert channels that are able to restore the original overt information without leaving any direct evidence of their appearance. Some of these reversible covert channels are based upon computational intensive operations, like for example encoding hidden information in the authentication hashes of a hash chain based one-time password. For such a covert channel implementation, the hash function has to be called repeatedly to extract the hidden message and to restore the original information.