Ireneusz KUBIAK

TEMPEST font counteracting a noninvasive acquisition of text data

The protection of information against electromagnetic penetration has huge signi cance. Different solutions, technological or organizational, are used to protect the information-limiting levels of unintentional emissions.In particular, technological solutions are implemented in commercial devices to limit levels of electromagnetic emissions. Nevertheless, such solutions cannot always be used. This is connected with the construction of these devices. Very often the devices do not have enough space on the inside to install new elements such as lters, electromagnetic shielding, and others.In the paper a new solution is proposed.The solution does not change the construction of the devices (e.g., printers, screens). The new method is based on computer fonts called TEMPEST fonts (safe fonts). In contrast to traditional fonts (e.g., Arial or Times New Roman), the new fonts are devoid of distinctive features. Without these features the characters of the new fonts are similar each other. At the output of the information in ltration channel the characters of the TEMPEST fonts limit the possibilities of recognition of characters that appear on the reconstructed image. The image is reconstructed based on an electromagnetic emission, which is correlated with the process information. In this paper the dominance of the TEMPEST fonts over the traditional fonts and Sang Mun fonts in the protection of information against electromagnetic penetration is demonstrated. The TEMPEST fonts have wider use. They are also resistant to optical character recognition programs. The use of the TEMPEST fonts in special systems allows the safe processing of data while displaying them on the screen as well as printing them on laser printers, especially on laser printers with LED slats.

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[1] Kubiak I, Przybysz A. Electromagnetic protection of information and communication technology systems and networks. Telecommunication Review and Telecommunication News 2006; 12: 371-374 (in Polish with an abstract in English).
[2] Grzesiak K, Kubiak I, Musia lS, Przybysz A. Electromagnetic Information Security. Warsaw, Poland: Publisher House of Military University of Technology, 2009 (in Polish with an abstract in English);
[3] Kubiak I, Musial S. Hardware raster generator as a tool that supports electromagnetic in ltration. Telecommuni- cation Review and Telecommunication News 2011; 11: 1601-1607 (in Polish with an abstract in English).
[4] Kubiak I. Power line as a source of sensitive emissions from laser printers. Prz Elektrotechniczn 2017; 6: 106-111 (in Polish with an abstract in English).
[5] Kubiak I. The unwanted emission signals in the context of the reconstruct possibility of data graphics. International Journal of Image, Graphics and Signal Processing 2014; 11: 1-9.
[6] Grzesiak K, Przybysz A. Software raster generator. Telecommunication Review and Telecommunication News 2011; 11: 1596-1600,(in Polish with an abstract in English).
[7] Kubiak I. Video signal level (colour intensity) and effectiveness of electromagnetic in ltration. B Pol Acad Sci Tech 2016; 64: 207-2018.
[8] Przybysz A. Emission security of DVI and HDMI interfaces. Telecommunication Review and Telecommunication News 2014; 7: 669-673 (in Polish with an abstract in English).
[9] Kubiak I. Digital (DVI) and analog (VGA) graphic standard in electromagnetic protection of text information. Telecommunication Review and Telecommunication News 2014; 6: 413-416 (in Polish with an abstract in English).
[10] Loughry J, Umphress DA. Information leakage from optical emanations. ACM T Inform Syst Se 2002; 5: 262-289.
[11] Kubiak I, Przybysz A. The impact of commercial equipment design to electromagnetic protection of data process. Prz Elektrotechniczn 2015; 11: 41-44 (in Polish with an abstract in English).
[12] Grzesiak K, Przybysz A. Emission security of laser printers. In: Military Communications and Information Systems Conference; 27{28 September 2010; Wroclaw, Poland. Warsaw, Poland: Publisher House of Military University of Technology. pp. 353-363.
[13] Kubiak I, Przybysz A. Printing technology and electromagnetic protection of information. Prz Elektrotechniczn 2016; 1: 177-181 (in Polish with an abstract in English).
[14] Kubiak I, Przybysz A. Laser printers and effectiveness of attack type TEMPEST. Warsaw, Poland: Publisher House of Military University of Technology, 2016 (in Polish with an abstract in English).
[15] Kuhn MG. Compromising Emanations: Eavesdropping Risks of computer displays, Technical Report. Cambridge, UK: University of Cambridge Computer Laboratory, 2003.
[16] Kuhn MG. Optical time-domain eavesdropping risks of CRT displays. In: Proceedings of the 2002 IEEE Symposium on Security and Privacy; 12{15 May 2002; Berkeley, CA, USA. New York, NY, USA: IEEE. pp. 3-18.
[17] Kubiak I. Computer Font Resistant to Electromagnetic In ltration. Warsaw, Poland: Publisher House of Military University of Technology, 2014 (in Polish with an abstract in English).
[18] Kubiak I. Computer Font Resistant to Electromagnetic In ltration. Results of Tests and Analises. Warsaw, Poland: Publisher House of Military University of Technology, 2014 (in Polish with an abstract in English).
[19] Kubiak I. Null Pointer computer font { electromagnetic safe or not? Telecommunication Review and Telecommu- nication News 2015; 1: 11-18 (in Polish with an abstract in English).
[20] Kubiak I. Computer font resistant to electromagnetic in ltration process. Prz Elektrotechniczn 2014; 6: 207-215 (in Polish with an abstract in English).
[21] Kubiak I. Methods of Analysis and Digital Processing of Images in Electromagnetic In ltration Process. Warsaw, Poland: Publisher House of Military University of Technology, 2013 (in Polish with an abstract in English).
[22] Bahare J, Abdolah C. Persian sign language recognition using radial distance and Fourier transform. International Journal of Image, Graphics and Signal Processing 2014; 1: 40-46.
[23] Michael JM. The Pentagon worries that spies can see its computer screens, someone could watch what's on your VDT. Wall Street Journal 07.08.2000.
[24] Ketenci SS, Gangal A. Automatic reduction of periodic noise in images using adaptive Gaussian star lter. Turk J Electr Eng Co 2017; 25: 2336-2348.