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Digital signature scheme is commonly employed in modern electronic commerceand quantum digital signature (QDS) offers the information-theoretical securityby the laws of quantum mechanics against attackers with unreasonablecomputation resources. The focus of previous QDS was on the signature of 1-bitmessage. In contrast, based on quantum ghost imaging with security test, wepropose 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 therequirements of quantum resources and classical communications. The multi-bitprotocol could simplify the procedure of QDS for long messages in practicalapplications.

Multi-bit quantum digital signature based on quantum temporal ghost imaging