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Two-Dimensional Correlation as a Search Method of Relationship between Pattern Image and Compromising Emanation

机译：二维相关性作为图案图像与折衷辐射之间关系的一种搜索方法

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In the era of technological advance in development of electronic equipment and its widespread application for everyday use, the issues related to protection of information against electromagnetic penetration become the matters of key importance. Each piece of equipment that is used for processing confidential information may happen to be a source of undesired emissions. However, due to design solutions applied to engineering of such devices, the levels of compromising emission signals are very low. To evaluate vulnerability of such equipment to eavesdropping, it is necessary to apply methods that enable picking up substantial information that is hidden in noise. In particular, it refers to signals that are correlated with signals of graphic transmission tracks of computers since capturing such signals enables reproduction of images that are displayed on the screen of the “eavesdropped” computer. Use of the methods that are suitable for digital processing of images, even modified for needs of successful electromagnetic infiltration, is insufficient to achieve the desirable results. Hence, it is necessary to seek for other more powerful and efficient methods, where the method of two-dimensional correlation between the pattern image and fragments of the images subjected to the analysis seems to be the most promising one, where the images can be reproduced from the compromising emanation with use of the half-tone screening method. For such cases, the correlation factor never reaches the levels that correspond to a strong or even a weak correlation since its values for those fragments of the images under the analysis that comprise signs consistent with signs of the pattern reach the values of about 0.07. Therefore, one has to adopt a certain criterion that makes it possible to classify recognized fragments of images. The paper outlines the opportunities offered by application of the Zeroing Filter. The approach bases on the analysis of the amplitude value for the pixel that indicates potential position of the pattern image in the image under analysis and comparison of that amplitude against the average amplitude of adjacent pixels. When the differential amplitude exceeds the predefined threshold D the methods assumes that the location within the analyzed image with the desired sign of the pattern image is detected. The studies with the aim to confirm legitimacy of the assumed method were carried out for real images that had been acquired form signals of compromising emanation recorded for the special unit under test.
机译：在电子设备开发及其日常应用的技术进步时代，与保护信息免受电磁穿透有关的问题变得至关重要。用于处理机密信息的每台设备都可能是不希望有的排放源。但是，由于应用于此类设备工程的设计解决方案，损害发射信号的水平非常低。为了评估此类设备容易被窃听的可能性，有必要应用能够获取隐藏在噪声中的大量信息的方法。特别地，它是指与计算机的图形传输轨迹的信号相关的信号，因为捕获这样的信号使得能够再现在“窃听”的计算机的屏幕上显示的图像。使用适合于图像的数字处理的方法，甚至为了成功的电磁渗透的需要而修改的方法，也不足以实现期望的结果。因此，有必要寻找其他更强大和有效的方法，其中在图案图像和经过分析的图像片段之间进行二维相关的方法似乎是最有前途的方法，在该方法中可以再现图像。从使用半色调筛选方法的妥协发散。对于这种情况，相关因子永远不会达到对应于强相关或弱相关的水平，因为在分析中图像的那些与图案的符号一致的符号的那些值的值达到约0.07的值。因此，必须采用一种特定的标准，该标准可以对识别出的图像片段进行分类。本文概述了归零过滤器的应用所提供的机会。该方法基于对像素的幅度值的分析，该幅度值指示图案图像在被分析的图像中的潜在位置，并将该幅度与相邻像素的平均幅度进行比较。当差分幅度超过预定阈值D时，这些方法假定检测到分析图像内具有图案图像的期望符号的位置。旨在确认所假设方法的合法性的研究是针对真实图像进行的，这些真实图像是从记录在特殊被测单元中的散发辐射信号中获取的。

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