Method and device for detecting blinding vulnerability of gated detectors in quantum key distribution system

Abstract

The invention discloses a method and device for detecting blinding loopholes of gating detectors in a quantum key distribution system, including a blinding pulse light generation module, a trigger pulse light generation module, a quantum signal interception module, a classical signal interception module, and clock synchronization module. By simulating the general form of blinding attack—pulse light blinding attack, the present invention realizes the relatively thorough detection of the blinding loophole of the gating detector for the first time, and provides guarantee for improving the actual security of the quantum key distribution system.

Description

technical field [0001] The invention relates to a general detection method and device for the blinding loophole of a gated photodetector (SPD) in a quantum key distribution (QKD) system, and belongs to the technical field of quantum secret communication. Background technique [0002] Quantum key distribution (QKD) systems are proven to be information-theoretic secure. However, there are some deviations from the ideal model in the actual engineering implementation of the QKD system. These loopholes give the attacker the opportunity to eavesdrop on the key and threaten the security of the actual QKD system. A well-known vulnerability is the blinding vulnerability of the gated photodetector (SPD). Since there is a large resistor in series with the avalanche photodiode (APD) in the internal structure of the SPD, when the attacker irradiates the APD with strong light, the large current generated makes the bias voltage at both ends of the APD too low, and the APD enters the linea...

AI Technical Summary

Problems solved by technology

However, on the one hand, the effectiveness of the photocurrent monitoring scheme has not been proved theoretically. On the other hand, the engineering implementation of photocurrent monitoring adopted in a large number of commercial QKD systems is only for the special form of continuous photoblinding attack. , without considering the effectiveness of the more general, harder-to-detect pulsed light blinding attack

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