Study of shielding effectiveness on spurious emissions of information systems by means of metallic and carbon powder screens

Idita, Alexandra; Rosu, Georgiana; Boitan, Alexandru; Butnariu, Vlad; Trip, Bogdan; Baltag, Octavian

doi:10.1109/icate.2018.8551420

Cited by 9 publications

(3 citation statements)

References 5 publications

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“…The effectiveness of the electromagnetic infiltration can be limited in several ways: limiting levels of electromagnetic emissions correlated (having distinctive features) with processed information [14][15][16][17], a disturbance of existing revealing emissions [18,19] or appropriate shaping of the emission source to eliminate features that enable identification e.g., of text data characters [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Security of TEMPEST Fonts against Electromagnetic Eavesdropping by Using Different Specialized Receivers

Kubiak

Boitan²,

Halunga

2020

Applied Sciences

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The main topic of the present paper is the printed text protection against electromagnetic infiltration. There are many solutions to protect such data. One of these methods is the one that uses computer fonts that are characterized by special shapes. The suitability of the solution has to be confirmed by many tests and analyses. An important element of such researches is the class of receiving devices used. In the case of measurements of the valuable emissions arising from electronic data processing of the printed text, typical receivers that are used for measurements of electromagnetic compatibility cannot be used. They have to be dedicated devices for measuring the very low level of signal that arises unintentionally. The sensitivity of the receiver must be very high in wide measuring bands. In addition, in order to assess the method of preventing electromagnetic infiltration, it is important to verify it by independent institutions. An additional advantage is the use of different receivers in the assessment process. This paper presents the results of studies made regarding the suitability of two sets of fonts with special shapes (secure symmetrical and secure asymmetrical) in secure information processing. The analysis of the fonts was based on visual examination, a basic method of preliminary assessment of electromagnetic emissions correlated with processed text information, of the images reproduced from unwanted emissions. The tests were carried out at two independent institutions, Military Communication Institute—Poland, Special Telecommunications Services—Romania, using three different types of receivers: Tempest Test System DSI-1550A, Rohde & Schwarz FSET22 and Rohde & Schwarz FSWT. The images obtained in the two independent laboratories with different setup and test equipment confirmed thus without doubt the possibility of using special fonts as the solution against an effectiveness of electromagnetic infiltration. The above assessment is correct, regardless of the used receiver and the environment of implementation of the secure fonts.

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Section: Introductionmentioning

confidence: 99%

Assessing the Security of TEMPEST Fonts against Electromagnetic Eavesdropping by Using Different Specialized Receivers

Kubiak

Boitan²,

Halunga

2020

Applied Sciences

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“…The risk of electromagnetic infiltration has also been studied for peripheral communications of personal computers (PC), such as the keyboard, whether it is USB [16,17] or PS/2 [16,18,19] type, RS-232 communication cable [20] that is still used in many existing implementations, USB devices [21], Ethernet communication [22] or VGA video graphics array connectors [9]. In [23], researchers performed studies and measurements for several shielding configurations for the electromagnetic screens and their suitability and efficiency of the electromagnetic emissions of information systems, while in [24] the authors performed channel measurements to evaluate the electromagnetic emanation security in the 200-1000 MHz frequency bandwidth, and proposed some adaptive security limits that depends on the total radio attenuation and on the extent of required confidentiality. In [25], researchers presented several testing and countermeasure methods against electromagnetic security threats and some a risk evaluation method of countermeasure technique for preventing electromagnetic information leakage is studied, based on the International Telecommunication Union (ITU) recommendation [26].…”

Section: Introductionmentioning

confidence: 99%

Method of Colors and Secure Fonts Used for Source Shaping of Valuable Emissions from Projector in Electromagnetic Eavesdropping Process

et al. 2020

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The protection of information processed electronically involves a large number of IT devices from computer sets or laptops to monitors, printers, servers, etc. In many cases, classified information processing might be associated with the use of projectors, which are an indispensable element of meetings for a limited group of people. Such devices are connected to computers through interfaces of various analogue and digital standards and can become an additional source of unwanted emissions, and the distinctive features of these emissions allow the information displayed to be unwantedly reproduced. This paper offers evidence of the existing threat related to electromagnetic infiltration of several projectors, by showing images reconstructed from registered revealing emissions. The paper presents an analysis of several solutions that can be used to reduce the level of infiltration susceptibility of projectors or to highlight this property in the device assessment process. The possibilities of using special computer fonts and the so-called method of colors—background color and text color—is analyzed. The tests were carried out on randomly selected projectors in two independent laboratories, and, based on these results, a number of interesting conclusions have been highlighted at the end.

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“…In these cases, both hard and soft solutions are used. Electromagnetic shielding, electromagnetic gaskets, power and signal filters, and ferrites are the most popular technical solutions to limit levels of electromagnetic emissions [8,9]. To counteract the electromagnetic eavesdropping process, a software solution can be used [3].…”

Section: Introductionmentioning

confidence: 99%

Possibilities of Electromagnetic Penetration of Displays of Multifunction Devices

2020

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A protection of information against electromagnetic penetration is very often considered in the aspect of the possibility of obtaining data contained in printed documents or displayed on screen monitors. However, many printing devices are equipped with screens based on LED technology or liquid crystal displays. Options enabling the selection of parameters of the printed document, technical settings of the device (e.g., screen activity time) are the most frequently displayed information. For more extensive displays, more detailed information appears, which may contain data that are not always irrelevant to third parties. Such data can be: names of printed documents (or documents registered and available on the internal media), service password access, user names or regular printer user activity. The printer display can be treated as a source of revealing emissions, like a typical screen monitor. The emissions correlated with the displayed data may allow us to obtain the abovementioned information. The article includes analyses of various types of computer printer displays. The tests results of the existing threat are presented in the form of reconstructed images that show the possibility of reading the text data contained in them.

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Study of shielding effectiveness on spurious emissions of information systems by means of metallic and carbon powder screens

Cited by 9 publications

References 5 publications

Assessing the Security of TEMPEST Fonts against Electromagnetic Eavesdropping by Using Different Specialized Receivers

Assessing the Security of TEMPEST Fonts against Electromagnetic Eavesdropping by Using Different Specialized Receivers

Method of Colors and Secure Fonts Used for Source Shaping of Valuable Emissions from Projector in Electromagnetic Eavesdropping Process

Possibilities of Electromagnetic Penetration of Displays of Multifunction Devices

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