Font Design—Shape Processing of Text Information Structures in the Process of Non-Invasive Data Acquisition

Kubiak, Ireneusz

doi:10.3390/computers8040070

Cited by 5 publications

(8 citation statements)

References 20 publications

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“…The article presents the results of tests and analyses in the field of using the acoustic signals in the non-invasive acquisition of data [17][18][19] on the shape of objects printed using a 3D printer. The acoustic signals usable for the acoustic infiltration process are generated by the stepper motors that control the printhead and platform movements.…”

Section: Discussionmentioning

confidence: 99%

Usefulness of Acoustic Sounds from 3D Printers in an Eavesdropping Process and Reconstruction of Printed Shapes

2020

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Information protection is an essential safety issue in many human activity fields. The development of computerisation (informatisation) brings new challenges in the area of non-invasive information processing in information technology (IT) systems. The known fact is that VGA, DVI/HDMI interfaces, for example, or formatter systems of laser printers that process video signals are sources of effective disclosing electromagnetic emission. Emission safety of the more and more common three-dimensional (3D) printers is less known. The selected 3D printer with the ME3DP (Material Extrusion 3D Printing) technology was tested to analyse the existing risk. Simple objects were printed during its operation to identify the stepping motor operation that are emission sources in the secondary channels. The analysis carried out focused on finding the correlation between the registered emissions and the printer head (printhead) movements when printing an object. It was shown that the analysis of the registered sensitive signal runtimes and their spectrograms allows us to recreate the printed object shape. The studies focused on measuring the acoustic signals that came from the stepping motors. The analysis of the possibilities of identifying the shapes of printed objects was based on the visual method. The article presents the study results and their analyses.

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Section: Discussionmentioning

confidence: 99%

Usefulness of Acoustic Sounds from 3D Printers in an Eavesdropping Process and Reconstruction of Printed Shapes

2020

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“…Additionally visual analyses and correlation analyses were carried out for each secure font. The analyses were based on values of character error rate (CER) [20]. The tests were performed with a Fujitsu Siemens laptop, Lifebook C110.…”

Section: Military Communication Institutementioning

confidence: 99%

“…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%

“…That is why the visual method is used, and, as with any method based on human perception, quantitative numerical indicators do not apply. However, many test subjects have been used, and the conclusions regarding the degree of similarity between different letters and numbers written with the secure symmetrical and secure asymmetrical fonts are presented in section 4 [20]. It has been proven that the results obtained based on visual method correspond to the ones that used numerical algorithms for similarity assessment and character recognition algorithms.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The information infiltration process represents the access to information processed by the equipment through reception and processing techniques of electromagnetic emissions generated by the targeted equipment without having physical access to it. The risks associated with the process of electromagnetic infiltration are very often described and analyzed in relation to computers [5][6][7], monitors [5,[8][9][10][11] or laser printers [12][13][14][15]. Each such device becomes a source of undesirable emissions, which enable non-invasive acquisition of information.…”

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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Font Design—Shape Processing of Text Information Structures in the Process of Non-Invasive Data Acquisition

Cited by 5 publications

References 20 publications

Usefulness of Acoustic Sounds from 3D Printers in an Eavesdropping Process and Reconstruction of Printed Shapes

Usefulness of Acoustic Sounds from 3D Printers in an Eavesdropping Process and Reconstruction of Printed Shapes

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

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