研究目的
Investigating the unintentional electromagnetic emanations from LED arrays used in monochrome computer printers and their potential to leak classified information.
研究成果
The use of LED array technology in printers increases the level of electromagnetic protection of information compared to laser printers. The differential signaling method used in Printer B significantly reduces the level of useful electromagnetic emission from an eavesdropper's perspective, making it more resistant to electromagnetic eavesdropping than Printer A and typical laser printers. However, the low quality of the decoded data from Printer B's signals makes interpretation difficult.
研究不足
The study was limited to two specific printers, and the results may not be generalizable to all printers using LED array technology. Additionally, the potential RF masking effect of a non-TEMPEST computer located near a non-TEMPEST printer was acknowledged but not fully explored.
1：Experimental Design and Method Selection:
The study involved analyzing the electromagnetic emanations from two different printers (Printer A and Printer B) that use LED array technology. The methodology included probing signal wires to understand the structure of control signals and the LED array's control mechanism.
2：Sample Selection and Data Sources:
Two printers with different LED array control methods were selected for analysis. The data sources were the electromagnetic signals emitted during the printers' operation.
3：List of Experimental Equipment and Materials:
The equipment used included an anechoic chamber for testing, a TEMPEST DSI 1550A receiving system for measuring sensitive emissions, and a TEMPEST computer to connect the printers.
4：Experimental Procedures and Operational Workflow:
The printers were connected to a TEMPEST computer, and their electromagnetic emissions were measured in a controlled environment. The signals were recorded and analyzed to reconstruct images from the intercepted RF emanations.
5：Data Analysis Methods:
The analysis involved comparing the reconstructed images from the intercepted signals to assess the legibility of the information and the effectiveness of different LED array control methods in preventing electromagnetic eavesdropping.
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