Protective device and method for alternating current power supply conduction electromagnetic information leakage

Abstract

The invention relates to an information security technology, and particularly discloses a protective device and method for alternating current power supply conduction electromagnetic information leakage. According to the technical purpose, a novel structure of the protective device and the protective method are provided so as to reduce the device grounding requirements, and even under the condition that the device grounding is poor, the common-mode signal and the different-mode signal in leakage signals still can be well filtered. The protective device is characterized by comprising a shell (4), and the shell (4) internally comprises an input end alternating current connector (5), an input-stage common-mode filter circuit (6), a common-mode and different-mode filter circuit (7), an output-stage common-mode filter circuit (8) and an output end alternating current connector (9), wherein the input end alternating current connector (5), the input-stage common-mode filter circuit (6), the common-mode and different-mode filter circuit (7), the output-stage common-mode filter circuit (8) and the output end alternating current connector (9) are connected in sequence.

Description

technical field [0001] The invention relates to information security technology, in particular to a protection device and method for leakage of electromagnetic information conducted by AC power supply. Background technique [0002] During the working process of the digital system, the information stored and processed by the system will be emitted intentionally or unintentionally through radiation leakage and conduction leakage. Using TEMPEST (Transient ElectromagneticPulse Emanation Surveillance Technology) technology, the leaked electromagnetic The signal is recovered far from the source of the leak. The power line conduction information leakage is a main way of conduction leakage. Aiming at the conduction information leakage of the power line, the existing protection method is to connect red and black isolation devices in series on the conduction line for filtering to achieve isolation. [0003] The traditional red and black isolation device connects the common mode indu...

AI Technical Summary

Problems solved by technology

Based on this principle, the traditional red-black isolation device has high requirements for the grounding effect of the ground wire, and the ideal red-black isolation effect can only be achieved under the condition of good grounding. In the middle, the corresponding red and black isolation effect cannot be achieved

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