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This paper identifies new class of network steganography methods that utilize mechanisms to handle oversized packets in IP networks: IP fragmentation, PMTUD (Path MTU Discovery) and PLPMTUD (Packetization Layer Path MTU Discovery). In particular, the authors propose two new steganographic methods and two extensions of existing ones. They show how IP fragmentation simplifies utilizing steganographic methods which require transmitter-receiver synchronization. They present how mentioned mechanisms can be used to enable hidden communication for both versions of IP protocol: 4 and 6. Also the detection of the proposed methods is enclosed in this paper.
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