Abstract
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.
Highlights
Electronic devices are widely used for information processing, and this applies to single devices and to more complex systems, that may be used for personal purposes, inside companies or even for military applications
The goal has been maintained over the years and the standardization of this field has expanded to NATO SECAN Doctrine and Information Publications (SDIPNATO standards for Tempest) and EU (IASG- Information Assurance Security Guidelines on Accreditation of EUTEMPEST Companies standards) areas [3,4]
This paper presents the risks associated electromagnetic infiltration process increases.with the use of projectors used to present data subject to electromagnetic protection
Summary
Electronic devices are widely used for information processing, and this applies to single devices and to more complex systems, that may be used for personal purposes, inside companies or even for military applications. The results presented in this paper were obtained after performing specialized laboratory measurements that are specific to the Tempest field [1,2,3,4]. This technical field was first discovered and promoted by the US government and referred to the protection of classified information in the military domain. 150 measured255 255 255 fo=520MHz: Safe asymmetrical font, dimension 48p., text color—blue, background color—white and (b). Their high correlation properties between font characters, make it difficult to distinguish the characters and the legibility of
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