Abstract
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.
Highlights
Constant technical progress means that more and more advanced electronic devices are present in every area of our lives
Each device is a source of valuable emissions which allow to reconstruct primary information
The solution does not limit levels of electromagnetic emissions, but it eliminates the distinctive features of the emissions which would allow the reconstruction of primary information (Figure 2)
Summary
Constant technical progress means that more and more advanced electronic devices are present in every area of our lives. Each device is a source of valuable emissions which allow to reconstruct primary information. It is possible because information is processed in graphic form Such sources of electromagnetic emissions are known and popular; they are protected. In this case, the noise levels have to be higher than levels of valuable emissions This is not a good solution in terms of protecting the electromagnetic environment. In large companies, where very extensive systems are used by many users, during personalization of tasks, leakage of seemingly irrelevant data may occur. This information may be disclosed by electromagnetic emission [15,16,17,18,19] They may pose to the interests of companies.
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