volume | PIER Journals

Abstract

Coupling in electronic devices may be a threat for the security of the information they process. Indeed, a current flowing into a conductor may radiate an electromagnetic field that will couple onto other conductors creating parasitic signals. If this current conveys sensitive information, its confidentiality may not be guaranteed. Moreover, depending on the amplitude of these parasitic signals, dysfunction may occur. It is thus valuable to assess the coupling effects in order to evaluate the probability that a current or a voltage reaches a given magnitude. This relevant quantity may be an input for a risk analysis process. In this study, we will focus on the study of couplings in reverberant cavities, and especially into the chassis of desktop computers. We will highlight that the Random Coupling Model (RCM) may be applied to determine statistical quantities related to induced currents or voltages between several ports placed inside a reverberant environment. Comparisons with experimental data, for several system configurations, show that the application of this model is relevant and allows to rapidly obtain the percentiles of the induced currents. At first, the coupling between two monopoles is studied, and then the coupling between printed circuit boards that are stacked together is investigated. Finally, the effect of adding broadband absorbers in casings is assessed.

1. Backstrom, M. G. and K. G. Lovstrand, "Susceptibility of electronic systems to high-power microwaves: Summary of test experience," IEEE Transactions on Electromagnetic Compatibility, Vol. 46, No. 3, 396-403, 2004. Google Scholar

2. Berry, M. V., "Regular and irregular semiclassical wavefunctions," Journal of Physics A: Mathematical and General, Vol. 10, No. 12, 2083, 1977. Google Scholar

3. Camurati, G., S. Poeplau, M. Muench, T. Hayes, and A. Francillon, "Screaming channels: When electromagnetic side channels meet radio transceivers," Proceedings of the 2018 ACM SIGSAC Conference on Computer and Communications Security, CCS’18, 163-177, New York, NY, USA, 2018 (Association for Computing Machinery). Google Scholar

4. Cottais, E., J. L. Esteves, and C. Kasmi, "Second order soft-tempest in rf front-ends: Design and detection of polyglot modulations," 2018 International Symposium on Electromagnetic Compatibility (EMC EUROPE), 166-171, Aug. 2018. Google Scholar

5. Dyson, F. J., "A brownian-motion model for the eigenvalues of a random matrix," Journal of Mathematical Physics, Vol. 3, No. 6, 1191-1198, Nov. 1962. Google Scholar

6. Eaton, J. W., D. Bateman, S. Hauberg, and R. Wehbring, "GNU Octave version 4.2.1 manual: A high-level interactive language for numerical computations,", 2017. Google Scholar

7. Wigner, E. P., "Random matrices in physics," SIAM Review, Vol. 9, No. 1, 1-23, 1967. Google Scholar

8. Flintoft, I. D., S. L. Parker, S. J. Bale, A. C.Marvin, J. F. Dawson, and M. P. Robinson, "Measured average absorption cross-sections of printed circuit boards from 2 to 20 GHz," IEEE Transactions on Electromagnetic Compatibility, Vol. 58, No. 2, 553-560, 2016. Google Scholar

9. Gil Gil, J., Z. B. Drikas, T. D. Andreadis, and S. M. Anlage, "Prediction of induced voltages on ports in complex, three-dimensional enclosures with apertures, using the random coupling model," IEEE Transactions on Electromagnetic Compatibility, Vol. 58, No. 5, 1535-1540, Oct. 2016. Google Scholar

10. Gradoni, G., T. M. Antonsen, S. M. Anlage, and E. Ott, "A statistical model for the excitation of cavities through apertures," IEEE Transactions on Electromagnetic Compatibility, Vol. 57, No. 5, 1049-1061, Oct. 2015. Google Scholar

11. Gradoni, G., T. M. Antonsen, S. Anlage, and E. Ott, "Theoretical analysis of apertures radiating inside wave chaotic cavities," 2012 International Symposium on Electromagnetic Compatibility (EMC EUROPE), 1-6, IEEE, 2012. Google Scholar

12. Gradoni, G., J.-H. Yeh, B. Xiao, T. M. Antonsen, S. M. Anlage, and E. Ott, "Predicting the statistics of wave transport through chaotic cavities by the random coupling model: A review and recent progress," Wave Motion, Vol. 51, No. 4, 606-621, 2014. Google Scholar

13. Guri, M., A. Kachlon, O. Hasson, G. Kedma, Y. Mirsky, and Y. Elovici, "Gsmem: Data exfiltration from air-gapped computers over GSM frequencies," 24th USENIX Security Symposium (USENIX Security 15), 849-864, Washington, D.C., Aug. 2015 (USENIX Association). Google Scholar

14. Hart, J. A., T. M. Antonsen, Jr., and E. Ott, "Effect of short ray trajectories on the scattering statistics of wave chaotic systems," Physical review E, Vol. 80, No. 4, 041109, 2009. Google Scholar

15. Hayashi, Y., N. Homma, M. Miura, T. Aoki, and H. Sone, "A threat for tablet pcs in public space: Remote visualization of screen images using em emanation," Proceedings of the 2014 ACM SIGSAC Conference on Computer and Communications Security, CCS’14, 954-965, New York, NY, USA, 2014. Google Scholar

16. Hemmady, S., T. M. Antonsen, E. Ott, and S. M. Anlage, "Statistical prediction and measurement of induced voltages on components within complicated enclosures: A wave-chaotic approach,", Vol. 54, No. 4, 758-771, 2012. Google Scholar

17. Hemmady, S., X. Zheng, T. M. Antonsen, Jr., E. Ott, and S. M. Anlage, "Universal statistics of the scattering coefficient of chaotic microwave cavities," Physical Review E, Vol. 71, No. 5, 056215, 2005. Google Scholar

18., http://anlage.umd.edu/RCM/. Google Scholar

19. Hemmady, S. D., "A wave-chaotic approach to predicting and measuring electromagnetic field quantities in complicated enclosures,", Ph.D. Thesis, University of Maryland, 2006. Google Scholar

20. Houchouas, V., M. Darces, N. Bourey, E. Cottais, Y. Chatelon, and M. Helier, "Comparison between simulation and measurement of EMI inside a computer chassis mock-up," 2018 International Symposium on Electromagnetic Compatibility (EMC EUROPE), 551-555, Aug. 2018. Google Scholar

21. Kasmi, C., J. Lopes-Esteves, N. Picard, M. Renard, B. Beillard, E. Martinod, J. Andrieu, and M. Lalande, "Event logs generated by an operating system running on a cots computer during iemi exposure," IEEE Transactions on Electromagnetic Compatibility, Vol. 56, No. 6, 1723-1726, Dec. 2014. Google Scholar

22. Kuhn, M. G., "Compromising emanations of LCD TV sets," IEEE Transactions on Electromagnetic Compatibility, Vol. 55, No. 3, 564-570, Jun. 2013. Google Scholar

23. Kune, D. F., J. Backes, S. S. Clark, D. Kramer, M. Reynolds, K. Fu, Y. Kim, and W. Xu, "Ghost talk: Mitigating EMI signal injection attacks against analog sensors," 2013 IEEE Symposium on Security and Privacy, 145-159, May 2013. Google Scholar

24. Mehta, M. L., Random Matrices, 3rd Ed., Vol. 142, Elsevier, 2004.

25. Parker, S. L., I. D. Flintoft, A. C. Marvin, J. F. Dawson, S. J. Bale, M. P. Robinson, M. Ye, C.Wan, and M. Zhang, "Changes in a printed circuit board’s absorption cross section due to proximity to walls in a reverberant environment," 2016 IEEE International Symposium on Electromagnetic Compatibility (EMC), 818-823, 2016. Google Scholar

26. Parker, S. L., I. D. Flintoft, A. C. Marvin, J. F. Dawson, S. J. Bale, M. P. Robinson, M. Ye, C.Wan, and M. Zhang, "Predicting shielding effectiveness of populated enclosures using absorption cross section of PCBs," 2016 International Symposium on Electromagnetic Compatibility --- EMC EUROPE, 324-328, 2016. Google Scholar

27. Parker, S. L., I. D. Flintoft, A. C. Marvin, J. F. Dawson, S. J. Bale, M. P. Robinson, M. Ye, C. Wan, and M. Zhang, "Absorption cross section measurement of stacked PCBs in a reverberation chamber," 2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC), Vol. 1, 991-993, 2016. Google Scholar

28. Van Eck, W., "Electromagnetic radiation from video display units: An eavesdropping risk?," Computers & Security, Vol. 4, No. 4, 269-286, 1985. Google Scholar

29. Vuagnoux, M. and S. Pasini, "Compromising electromagnetic emanations of wired and wireless keyboards," USENIX Security Symposium, 1-16, 2009. Google Scholar

30. Wand, M. P. and M. C. Jones, Kernel Smoothing, Chapman and Hall/CRC, 1994.

31. Yeh, J.-H., J. A. Hart, E. Bradshaw, T. M. Antonsen, E. Ott, and S. M. Anlage, "Experimental examination of the effect of short ray trajectories in two-port wave-chaotic scattering systems," Phys. Rev. E, Vol. 82, 041114, Oct. 2010. Google Scholar

32. Zheng, X., T. M. Antonsen, and E. Ott, "Statistics of impedance and scattering matrices in chaotic microwave cavities: Single channel case," Electromagnetics, Vol. 26, No. 1, 3-35, 2006. Google Scholar

33. Zheng, X., T. M. Antonsen, and E. Ott, "Statistics of impedance and scattering matrices of chaotic microwave cavities with multiple ports," Electromagnetics, Vol. 26, No. 1, 37-55, 2006. Google Scholar

Dr. Valentin Houchouas

Dr. Muriel Darces

Prof. Marc Hélier

Dr. Emmanuel Cottais

Dr. José Lopes Esteves