Security Limits for Electromagnetic Radiation from CRT Displays

Zoyousefein, Mahshid; Torshizi, Saeedeh Hashemniaye; Ghorbani, Ayaz

doi:10.1109/iccee.2009.191

Cited by 3 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It effect becomes important when a work with this typ of images lasts for a long time. The compromising emanations produced by the information display devices allow reconstruction of the data presented in them in the form of grayscale images [3][4][5][6]. Due to the very low levels of the measured signals, the accompanying noise and environmental disturbances, the reproduced images are of poor quality [7][8][9][10].…”

Section: Methods Of Pseudo-coloring With the Rgb Palettementioning

confidence: 99%

“…The effects of the new approach were analyzed by visual and analytical methods. As sources of compromising emanations, allowing for the registration of signals used to reproduce the images subject to analysis (as in the case of the electromagnetic infiltration process), a computer with a VGA and High Definition Multimedia Interface (HDMI) graphics path, a projector operating in the HDMI standard and a Voice over Internet Protocol (VoIP) terminal display were used [5,7,8]. The images processed on the primary side were the images shown in Figure 9.…”

Section: Primary Imagesmentioning

confidence: 99%

“…Taking into account properties of human vision, a solution for coloring images obtained in the process of electromagnetic infiltration has been proposed. Such images are reproduced using a palette of shades of gray [4,5]. The recorded compromising emanations contain information about the processed data in a graphical form.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pseudo-Coloring as an Effective Tool to Improve the Readability of Images Obtained in an Electromagnetic Infiltration Process

Kubiak,

Przybysz

2023

Applied Sciences

View full text Add to dashboard Cite

The article presents a method of improving the readability of images obtained in the process of electromagnetic infiltration for sources processing information in a visual form (texts, images). The method uses the so-called technique of pseudo-coloring. The proposed method is based on LUT tables using the exponential function mapping the signal level of the compromising emanations into a point of the RGB color space. The conducted analyses showed that the proposed function determining the coefficients of the LUT table is an effective tool in the process of improving the level of visual perception, i.e., it increases the perception of shapes and the ability to extract elements from the background. In image processing, LUT can be identified as a color map, i.e., a structure that reflects the gray shade of an image pixel into its color representation in the RGB color space. The proposed method assumes the use of exponential functions for this reflection. As an assessment of the effectiveness of the proposed methods of pseudo-coloring images, both a subjective assessment based on the visual perception of a group of observers and an analytical assessment, which was carried out by analyzing the contrast of the assessed images, were adopted. This allowed for the same assessment and usefulness of the proposed function in determining the RGB value in the process of pseudo-coloring of images obtained during electromagnetic infiltration. The obtained results confirmed that the proposed method significantly improves contrast parameter of images, which is also confirmed by the visual assessment of these images.

show abstract

Section: Methods Of Pseudo-coloring With the Rgb Palettementioning

confidence: 99%

Section: Primary Imagesmentioning

confidence: 99%

See 1 more Smart Citation

Pseudo-Coloring as an Effective Tool to Improve the Readability of Images Obtained in an Electromagnetic Infiltration Process

Kubiak,

Przybysz

2023

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Therefore, they are residual emissions, often distorted and disturbed by other signals accompanying the device's operation. These may be emissions correlated with vertical and horizontal deflection signals of computer monitors [20], or signals of cooling systems, heaters and stepper motors as in the case of multifunctional devices [21]. Due to such a special form of these signals, it becomes difficult to use classical methods of assessing their quality based on comparing the replica with a standard to evaluate the images reproduced from them.…”

Section: Introductionmentioning

confidence: 99%

“…However, a significant disadvantage of such images is the difficulty in perceiving many details, especially in cases that may be important from the point of view of assessing health [40], life [41], the body's bone structure [42] or information security. In the case of images acquired in the process of electromagnetic infiltration, the information contained in such images is distorted by other graphic elements due to very "weak" electromagnetic compromising emanation signals [20,21,43], which significantly impede data recognition and perception [44]. For better readability of the image, they should be removed (filtered).…”

Section: Introductionmentioning

confidence: 99%

An RGB Pseudo-Colorization Method for Filtering of Multi-Source Graphical Data

Kubiak,

Przybysz

2023

Electronics

View full text Add to dashboard Cite

Artificial colorization (pseudo-colorization) is a commonly used method to improve the readability of images obtained from sources (sensors) that do not reflect the original color of the object of observation (e.g., X-ray). It is designed to draw the observer’s attention to the important details of the analyzed image (e.g., disease changes in medical imaging). Analogous needs occur in the process of assessing the emission security (EMSEC) of imaging devices used to process classified information, which is made on the basis of the analysis of images reproduced from compromising emanations related to the operation of these devices. The presence of many graphic elements in an image may reduce the level of perception of the information contained in it. Such images may be very noisy or contain overlapping graphic symbols, the source of which is devices processing graphic information operating in close proximity to each other. The use of various types of measures enabling data filtration at various stages of their processing, e.g., the use of a directional antenna, frequency filtering, point filtering or contextual contrast modification, does not always prove effective. The solution to the filtration problem is the pseudo-colorization of the image. However, the image colorization used based on the typical “Hot”, “Radar” or “Cold” color palettes does not meet the requirements for filtering graphic data from many sources. It is necessary to use a filter that will allow the sharp cut-off of graphic data at the border between the background and the graphic symbol. For the pseudo-colorization process itself, the exponential function as a function of transforming the amplitudes of image pixels from the gray color space to the RGB color space is sufficient. However, the smooth transition of the function shape from zero values to values greater than zero results in a low efficiency of filtering graphic data from noise. In this article, a method of filtering an image based on the pseudo-colorization of its content, i.e., reproduction of a compromising emanation signal level in the RGB value of image pixel color components, was proposed. A quadratic function was proposed as the transformation function. The higher effectiveness of the method based on the use of a square function (compared to the exponential function) was shown by conducting tests on many images, some of which are presented in this article. The proposed solution is a universal approach and can be used in various fields related to image analysis and the need for their filtration. Its universality is related to the possibility of changing function parameters affecting its position on the value axis from 0 to 255, its width, its minimum and its maximum value for each RGB channel.

show abstract

Emission Security Limits for Compromising Emanations Using Electromagnetic Emanation Security Channel Analysis

Lee

Kim

et al. 2013

IEICE Trans. Commun.

View full text Add to dashboard Cite

Security Limits for Electromagnetic Radiation from CRT Displays

Cited by 3 publications

References 10 publications

Pseudo-Coloring as an Effective Tool to Improve the Readability of Images Obtained in an Electromagnetic Infiltration Process

Pseudo-Coloring as an Effective Tool to Improve the Readability of Images Obtained in an Electromagnetic Infiltration Process

An RGB Pseudo-Colorization Method for Filtering of Multi-Source Graphical Data

Emission Security Limits for Compromising Emanations Using Electromagnetic Emanation Security Channel Analysis

Contact Info

Product

Resources

About