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Implications of Coding Layers on Physical-Layer Security: A Secrecy Benefit Approach.

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  • 1Department of Electrical and Computer Engineering, Brigham Young University, Provo, UT 84602, USA.

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This study introduces practical secrecy for secure communication over real-world channels. It reveals that scrambling and interleaving offer no security benefits, while error-control coding balances security and reliability.

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Gaussian wiretap channelconcatenated codingequivocationphysical-layer security

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Area of Science:

  • Information Theory
  • Cybersecurity
  • Coding Theory

Background:

  • Secure communication over Gaussian wiretap channels is crucial.
  • Traditional physical-layer security methods require re-evaluation for real-world applications.
  • Finite blocklength coding introduces complexities in achieving information-theoretic security.

Purpose of the Study:

  • To define and utilize "practical secrecy" and "secrecy benefit" for finite blocklength codes.
  • To systematically analyze the impact of various coding layers on communication security and reliability.
  • To demonstrate the implications of coding mechanisms on information-theoretic security.

Main Methods:

  • Definition of practical secrecy and secrecy benefit.
  • Systematic analysis of error-control coding, scrambling, interleaving, and coset coding.
  • Evaluation of coding layers' effects at the eavesdropper's decoder output.

Main Results:

  • Scrambling and interleaving do not enhance information-theoretic security.
  • Error-control coding introduces a trade-off between secrecy and reliability, dependent on code choice and signal-to-noise ratios.
  • Secrecy coding benefits can be tailored using combined coding layers.

Conclusions:

  • Practical secrecy provides a realistic framework for evaluating secure communication systems.
  • The effectiveness of coding layers varies significantly, with error-control coding offering a tunable balance.
  • Optimized combinations of coding layers are essential for achieving both reliable and secure data transmission.