Continuous-variable quantum digital signatures against coherent attacks

• URL: http://arxiv.org/abs/2407.03609v1
• Date: Thu, 4 Jul 2024 03:39:59 GMT
• Title: Continuous-variable quantum digital signatures against coherent attacks
• Authors: Yi-Fan Zhang, Wen-Bo Liu, Bing-Hong Li, Hua-Lei Yin, Zeng-Bing Chen,
• Abstract summary: Quantum digital signatures (QDS) guarantee authenticity, integrity and non-repudiation of classical messages based on quantum laws. We introduce a CV QDS protocol designed to withstand general coherent attacks through the use of a cutting-edge fidelity test function. Results demonstrate a significant reduction of over 6 orders of magnitude in signature length for a megabit message signing task.
• Score: 5.777874043843867
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum digital signatures (QDS), which utilize correlated bit strings among sender and recipients, guarantee the authenticity, integrity and non-repudiation of classical messages based on quantum laws. Continuous-variable (CV) quantum protocol with heterodyne and homodyne measurement has obvious advantages of low-cost implementation and easy wavelength division multiplexing. However, security analyses in previous researches are limited to the proof against collective attacks in finite-size scenarios. Moreover, existing multi-bit CV QDS schemes have primarily focused on adapting single-bit protocols for simplicity of security proof, often sacrificing signature efficiency. Here, we introduce a CV QDS protocol designed to withstand general coherent attacks through the use of a cutting-edge fidelity test function, while achieving high signature efficiency by employing a refined one-time universal hashing signing technique. Our protocol is proved to be robust against finite-size effects and excess noise in quantum channels. In simulation, results demonstrate a significant reduction of over 6 orders of magnitude in signature length for a megabit message signing task compared to existing CV QDS protocols and this advantage expands as the message size grows. Our work offers a solution with enhanced security and efficiency, paving the way for large-scale deployment of CV QDS in future quantum networks.

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