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Detection of the Compromising Audio Signal by Analyzing Its AM Demodulated Spectrum

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Udgivet i:Symmetry vol. 16, no. 2 (2024), p. 209
Hovedforfatter: Alexandru Madalin Vizitiu
Andre forfattere: Dobrescu, Lidia, Trip, Bogdan Catalin, Vlad Florian Butnariu, Molder, Cristian, Halunga, Simona Viorica
Udgivet:
MDPI AG
Fag:
Propagation
Fatigue
Eavesdropping
Testing time
Headphones
Communication
Electronic devices
Emission
Information technology
Fatigue tests
Audio signals
Spectrum allocation
Audio data
Classified information
Electromagnetic pulses
Amplitude modulation
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Resumen:The information technology and communication (IT&C) market consists of computing and telecommunication technology systems, which also include a variety of audio devices. Preserving the confidentiality of transmitted information through these devices stands as a critical concern across various domains and businesses. Notably, spurious electromagnetic emanations emitted by audio devices can be captured and processed, potentially leading to eavesdropping incidents. The evaluation of electronic devices for potential security vulnerabilities often involves employing Transient Electromagnetic Pulse Emanation Standard (TEMPEST) technology. This paper introduces a novel approach to TEMPEST testing specifically tailored for audio devices. The outcomes of the proposed approach offer valuable insights into TEMPEST equipment testing, aiming to mitigate the potential risks posed by threats exploitable by eavesdroppers in everyday scenarios. The present work delves into the examination of two ubiquitous global electronic devices: a notebook and a pair of in-ear headphones. The symmetrical framework of this study arises from the intrinsic similarity that, despite belonging to distinct categories, both devices possess the capability to emit electromagnetic emissions that contain compromised audio signals. This assertion is substantiated by the measurement results presented herein. The proposed methodology involves the analysis of the audio amplitude modulation (AM) demodulated signal in the frequency domain. This innovative approach not only mitigates operator fatigue but also significantly reduces the testing time required for these devices and instrument running hours and leads to the development of new applications.
ISSN:2073-8994
DOI:10.3390/sym16020209
Fuente:Engineering Database