The paper presents and compares steganographic techniques that can be used to enable hidden communication within computer networks. A new class (steganophony) of such methods is introduced. Specific methods proposed by the authors - LACK, HICCUPS and SIP-based VoIP protocols' steganography - are briefly described. The main aim of network steganography is to hide secret data in users' normal data transmissions, ideally, so it cannot be detected by third parties. ...
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