Muted attack on a high-speed quantum key distribution system

• URL: http://arxiv.org/abs/2506.03718v1
• Date: Wed, 04 Jun 2025 08:49:25 GMT
• Title: Muted attack on a high-speed quantum key distribution system
• Authors: Jialei Su, Jialin Chen, Fengyu Lu, Zihao Chen, Junxuan Liu, Deyong He, Shuang Wang, Anqi Huang,
• Abstract summary: This study reveals the security loopholes introduced by the state-of-the-art SPAD.<n>We propose a muted attack on a high-speed QKD system that does not require intercept-and-resend operation.
• Score: 4.29987531294739
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: High-speed quantum key distribution (QKD) systems have achieved repetition frequencies above gigahertz through advanced technologies and devices, laying an important foundation for the deployment of high-key-rate QKD system. However, these advancements may introduce unknown security loopholes into the QKD system. Unfortunately, an eavesdropper Eve is challenging to exploit these security loopholes performing the intercept-and-resend attacks due to the limited time window under the high repetition frequency. Here, we disclose a security loophole in the 1-GHz single-photon avalanche detector (SPAD) and propose a muted attack on a high-speed QKD system that does not require intercept-and-resend operation. By sending hundreds of photons each time, Eve can mute Bob's SPADs to control the overall detection response of the QKD receiver, allowing her to learn nearly all the keys. This study reveals the security loopholes introduced by the state-of-the-art SPAD, being exploited to conduct the tailored attack on the high-speed QKD system.

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