Digital signature scheme is commonly employed in modern electronic commerce and quantum digital signature (QDS) offers the information-theoretical security by the laws of quantum mechanics against attackers with unreasonable computation resources. The focus of previous QDS was on the signature of 1-bit message. In contrast, based on quantum ghost imaging with security test, we propose a scheme of QDS in which a multi-bit message can be signed at a time. Our protocol is no more demanding than the traditional cases for the requirements of quantum resources and classical communications. The multi-bit protocol could simplify the procedure of QDS for long messages in practical applications.
@article{arxiv.1901.03004,
title = {Multi-bit quantum digital signature based on quantum temporal ghost imaging},
author = {Xin Yao and Xu Liu and Rong Xue and Heqing Wang and Hao Li and Zhen Wang and Lixing You and Yidong Huang and Wei Zhang},
journal= {arXiv preprint arXiv:1901.03004},
year = {2019}
}