Abstract
This paper presents a potential threat of remote visualization for screen displays of various mobile devices used in public spaces via electromagnetic waves (electromagnetic (EM) screen remote visualization). The traditional EM screen remote visualization uses nonportable equipment on a specific target device, and requires sufficient time to estimate the parameters related to information leakage of each target. In contrast, this paper proposes a method that allows for real-time estimation of information leakage parameters without requiring to know the target of remote visualization in details. The proposed method models the process of information leakage for each device, and consequently determines the frequency that leaks screen information faster than ever before. In addition, in this paper, portable equipment and a pseudo-antenna that blends into the mobile environment were used to implement the proposed method. The experiment shows that the screen image can be reconstructed from EM emanation obtained from the areas near some target devices. Furthermore, we discuss the measures against EM remote visualization of mobile devices.
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