Experimental quantum secure network with digital signatures and encryption
release_zy4aq3ssfzdhjlxwz2jels34ym
by
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
Abstract
Cryptography promises four information security objectives, namely,
confidentiality, integrity, authenticity and nonrepudiation, to support
trillions of transactions every year in the digital economy. Efficient digital
signatures, ensuring the integrity, authenticity and nonrepudiation of data
with provable security, are highly urgent and intractable open problems. Here,
we propose a protocol of high-efficiency quantum digital signature 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 provably 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.
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