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Security and eavesdropping in terahertz wireless links.

Jianjun Ma1, Rabi Shrestha1, Jacob Adelberg1

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Terahertz wireless communication security is challenged by novel eavesdropping methods. Even with narrow beams, an eavesdropper can scatter signals, necessitating new physical-layer security measures and transceiver designs.

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Information Security

Background:

  • Ubiquitous wireless systems require robust security protocols at all levels.
  • Terahertz (THz) frequencies offer increased directionality, potentially enhancing security.
  • Existing security assumptions for high-frequency wireless may not hold.

Purpose of the Study:

  • To investigate the feasibility of eavesdropping on line-of-sight terahertz transmissions.
  • To characterize novel eavesdropping techniques at THz frequencies.
  • To explore and evaluate potential countermeasures against THz eavesdropping.

Main Methods:

  • Demonstration of signal interception via scattering in line-of-sight THz transmissions.
  • Analysis of eavesdropper techniques involving physical obstruction and radiation scattering.
  • Evaluation of backscatter channel characterization as a detection countermeasure.

Main Results:

  • Contrary to expectations, THz signals with narrow beams can be intercepted by eavesdroppers.
  • Eavesdropping at THz frequencies utilizes scattering of the transmitted signal.
  • Backscatter channel characterization can detect some, but not all, eavesdropping attempts.

Conclusions:

  • Physical-layer security is critical for terahertz wireless networks.
  • Novel transceiver designs are needed to incorporate effective countermeasures against scattering-based eavesdropping.
  • The assumption of inherent security due to high directionality at THz frequencies is challenged.