Experimental quantum secure network with digital signatures and encryption

Abstract

Cryptography promises four information security objectives, namely, confidentiality, integrity, authenticity, and non-repudiation, to support trillions of transactions annually in the digital economy. Efficient digital signatures, ensuring the integrity, authenticity, and non-repudiation of data with information-theoretical security are highly urgent and intractable open problems in cryptography. Here, we propose a protocol of high-efficiency quantum digital signatures using secret sharing, one-time universal${}_2$ hashing, and the one-time pad. We just need to use a 384-bit key to sign documents of up to $2^{64}$ lengths with a security bound of $10^{-19}$. If one-megabit document is signed, the signature efficiency is improved by more than $10^8$ times compared with previous quantum digital signature protocols. Furthermore, we build the first all-in-one quantum secure network integrating information-theoretically secure communication, digital signatures, secret sharing, and conference key agreement and experimentally demonstrate this signature efficiency advantage. Our work completes the cryptography toolbox of the four information security objectives.

arXiv comment19 pages, 7 figures, 4 tables. Quantum digital signatures and quantum private communication maintain a consistent level of practicality

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Cited by in corpus (6)

• Breaking Rate-Distance Limitation of Measurement-Device-Independent Quantum Secret Sharing
• One-Time Universal Hashing Quantum Digital Signatures without Perfect Keys
• Beating the fault-tolerance bound and security loopholes for Byzantine agreement with a quantum solution
• Scalable High-Rate Twin-Field Quantum Key Distribution Networks without Constraint of Probability and Intensity
• Sharing Quantum Nonlocality in Star Network Scenarios
• Forty Thousand Kilometers Under Quantum Protection