Experimental quantum secure network with digital signatures and encryption [article]

Hua-Lei Yin, Yao Fu, Chen-Long Li, Chen-Xun Weng, Bing-Hong Li, Jie Gu, Yu-Shuo Lu, Shan Huang, Zeng-Bing Chen
2022 arXiv   pre-print
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,
more » ... 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:2107.14089v4 fatcat:vpx527quvrf4hlrv7damyh7cfe