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Ordinal synchronization mark sequence and its steganography for a multi-link network covert channel.

Songyin Fu1, Rangding Wang1, Li Dong1

  • 1Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, China.

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This study introduces a novel ordinal synchronization mark sequence (OSMS) to improve multi-link network covert channels (MLCCs). The OSMS enhances reliability and undetectability, outperforming existing Cloak methods, especially under network interference.

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Area of Science:

  • Computer Science
  • Network Security
  • Information Theory

Background:

  • Multi-link network covert channels (MLCCs) offer high capacity and robustness.
  • Existing methods like Cloak face limitations due to passive synchronization, causing transmission issues and anomalous link switching.

Purpose of the Study:

  • To propose a novel ordinal synchronization mark sequence (OSMS) for MLCCs to enhance packet distinguishability and synchronization.
  • To improve the reliability, throughput, and undetectability of MLCCs.

Main Methods:

  • A unidirectional function generates a random OSMS for covert modulation.
  • A one-way hash function embeds marks into arrangement of packets over the links (APL) packets.
  • A retrieval function at the receiver extracts marks and determines their order for packet reorganization and covert demodulation.

Main Results:

  • The proposed OSMS-embedded MLCC avoids passive synchronization issues inherent in the Cloak method.
  • Experiments show superior performance in reliability, throughput, and undetectability compared to Cloak.
  • The approach effectively resists inter-link correlation tests.

Conclusions:

  • The OSMS provides an effective solution for ordered packet distinguishability in MLCCs.
  • This method significantly enhances MLCC performance and security, particularly in challenging network conditions.
  • The OSMS-based MLCC offers a robust alternative to existing covert channel techniques.