Quantum digital signature method using marked single photon source

Abstract

A quantum digital signature (QDS) method using a labeled single photon source (HSPS) is divided into a preparation phase of the HSPS, a key distribution phase using a QDS scheme of the HSPS, and a signed message phase. Firstly, HSPS is obtained through down-conversion of spontaneous parameters, and after the marking effect is achieved, most of vacuum pulses are effectively eliminated. A key distribution protocol (KGP) is then performed on this basis such that participants in the signature protocol all obtain signed key strings. Finally, the transmission, verification and receiving (refusal) process of the signature information is carried out, and on the premise that the security of non-repudiation, unforgeability and transferability of the QDS protocol is met, whether the signature is valid or not is judged by comparing the mismatching rate between the key strings of the two parties. Compared with an existing QDS scheme using a weak coherent light source (WCS), the scheme has the advantages that the vacuum state proportion is reduced to a greater extent, the safe transmission distance is greatly increased, the method is efficient, feasible, simple and easy to operate, and a certainreference value is provided for the practicability of quantum cryptology.

Description

technical field [0001] The invention belongs to the field of quantum information, mainly relates to key distribution of quantum digital signature (QDS) information and verification of signature information, and has great use value in scenarios such as software distribution, electronic contracts, and financial transactions. Background technique [0002] After entering the rapid development of the information age, digital signature is a common technical means used to replace traditional physical signature, so that the process of signing agreement is no longer limited to the narrow same time and same place, which solves the inconvenience of many application scenarios sex. Classical digital signature security originates from asymmetric key encryption technology, which is mainly based on mathematical calculation complexity. The emergence of quantum computers will have a serious impact on traditional secure cryptographic systems, and traditional schemes that rely on computational...

AI Technical Summary

Problems solved by technology

Because QDS needs to obtain the signature key string through the key distribution protocol, similar problems also exist in the latter, and it is still facing a huge challenge to further implement QDS

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