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Security and eavesdropping in terahertz wireless links

Author

Listed:
  • Jianjun Ma

    (Brown University)

  • Rabi Shrestha

    (Brown University)

  • Jacob Adelberg

    (Brown University)

  • Chia-Yi Yeh

    (Rice University)

  • Zahed Hossain

    (University at Buffalo, The State University of New York)

  • Edward Knightly

    (Rice University)

  • Josep Miquel Jornet

    (University at Buffalo, The State University of New York)

  • Daniel M. Mittleman

    (Brown University)

Abstract

Resiliency against eavesdropping and other security threats has become one of the key design considerations for communication systems. As wireless systems become ubiquitous, there is an increasing need for security protocols at all levels, including software (such as encryption), hardware (such as trusted platform modules) and the physical layer (such as wave-front engineering)1–5. With the inevitable shift to higher carrier frequencies, especially in the terahertz range (above 100 gigahertz), an important consideration is the decreased angular divergence (that is, the increased directionality) of transmitted signals, owing to the reduced effects of diffraction on waves with shorter wavelengths. In recent years, research on wireless devices6–8 and systems9–11 that operate at terahertz frequencies has ramped up markedly. These high-frequency, narrow-angle broadcasts present a more challenging environment for eavesdroppers compared to the wide-area broadcasts used at lower frequencies12,13. However, despite the widespread assumption of improved security for high-frequency wireless data links14–16, the possibility of terahertz eavesdropping has not yet been characterized. A few recent studies have considered the issue at lower frequencies5,12,13,17,18, but generally with the idea that the eavesdropper’s antenna must be located within the broadcast sector of the transmitting antenna, leading to the conclusion that eavesdropping becomes essentially impossible when the transmitted signal has sufficiently high directionality15. Here we demonstrate that, contrary to this expectation, an eavesdropper can intercept signals in line-of-sight transmissions, even when they are transmitted at high frequencies with narrow beams. The eavesdropper’s techniques are different from those for lower-frequency transmissions, as they involve placing an object in the path of the transmission to scatter radiation towards the eavesdropper. We also discuss one counter-measure for this eavesdropping technique, which involves characterizing the backscatter of the channel. We show that this counter-measure can be used to detect some, although not all, eavesdroppers. Our work highlights the importance of physical-layer security in terahertz wireless networks and the need for transceiver designs that incorporate new counter-measures.

Suggested Citation

  • Jianjun Ma & Rabi Shrestha & Jacob Adelberg & Chia-Yi Yeh & Zahed Hossain & Edward Knightly & Josep Miquel Jornet & Daniel M. Mittleman, 2018. "Security and eavesdropping in terahertz wireless links," Nature, Nature, vol. 563(7729), pages 89-93, November.
  • Handle: RePEc:nat:nature:v:563:y:2018:i:7729:d:10.1038_s41586-018-0609-x
    DOI: 10.1038/s41586-018-0609-x
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    Citations

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    Cited by:

    1. Junliang Dong & Alessandro Tomasino & Giacomo Balistreri & Pei You & Anton Vorobiov & Étienne Charette & Boris Le Drogoff & Mohamed Chaker & Aycan Yurtsever & Salvatore Stivala & Maria A. Vincenti & C, 2022. "Versatile metal-wire waveguides for broadband terahertz signal processing and multiplexing," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Xuecou Tu & Yichen Zhang & Shuyu Zhou & Wenjing Tang & Xu Yan & Yunjie Rui & Wohu Wang & Bingnan Yan & Chen Zhang & Ziyao Ye & Hongkai Shi & Runfeng Su & Chao Wan & Daxing Dong & Ruiying Xu & Qing-Yua, 2024. "Tamm-cavity terahertz detector," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. Rabi Shrestha & Hichem Guerboukha & Zhaoji Fang & Edward Knightly & Daniel M. Mittleman, 2022. "Jamming a terahertz wireless link," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    4. Alexa Herter & Amirhassan Shams-Ansari & Francesca Fabiana Settembrini & Hana K. Warner & Jérôme Faist & Marko Lončar & Ileana-Cristina Benea-Chelmus, 2023. "Terahertz waveform synthesis in integrated thin-film lithium niobate platform," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    5. Takashi Arikawa & Jaeyong Kim & Toshikazu Mukai & Naoki Nishigami & Masayuki Fujita & Tadao Nagatsuma & Koichiro Tanaka, 2024. "Phase-resolved measurement and control of ultrafast dynamics in terahertz electronic oscillators," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    6. Josep M. Jornet & Edward W. Knightly & Daniel M. Mittleman, 2023. "Wireless communications sensing and security above 100 GHz," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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