Quantum digital signature method based on double-field protocol

Abstract

The invention aims to provide a quantum digital signature method based on a double-field protocol. In the secret key distribution stage of a quantum digital signature, a double-field secret key generation protocol (TF-KGP, Twin-Field KGP) is used for completing generation and distribution of secret keys, a user sends a quantum state to a special measuring party for measurement, and the credibilityof the measuring party does not need to be required. From the perspective of security, the TF-KGP is used, so the quantum digital signature system has the property irrelevant to measurement equipment, can resist side channel attacks aiming at the measurement equipment, and improves the security of the quantum digital signature system; from the perspective of practicability, under the same parameter condition, the number of secret keys which can be used for signature is greatly increased, so the secure transmission distance of signature and the signature rate at a long distance are improved, and the practical performance of the quantum digital signature system is improved.

Description

technical field [0001] The invention relates to the fields of quantum information technology and network information security technology, in particular to a quantum digital signature method based on a double-field protocol. Background technique [0002] Digital signature is one of the most important cryptographic protocols, and has a wide range of applications in verifying the authenticity and integrity of digital documents such as financial transactions and electronic contracts. Current digital signatures (hereinafter referred to as classic digital signatures) can only provide security based on computational complexity. For example, the security of the RSA algorithm depends on the factorization problem of large numbers, while the elliptic curve algorithm depends on the computational difficulty of discrete logarithms. However, with the development of mathematical algorithms and the emergence of quantum computers, these classic digital signature algorithms will eventually be...

AI Technical Summary

Problems solved by technology

However, the existing QDS protocol is difficult to take into account both security and practicability, and there are certain limitations

For example, although the BB84-type QDS (BB84-QDS) protocol has a high signature rate, it cannot resist side-channel attacks aimed at the measurement end, and its security is low; on the contrary, the MDI-QDS protocol has high security. But the signature rate is very limited

Most importantly, neither KGP in these two types of QDS protocols can break the linear bound between key generation rate and distance without using quantum repeaters, which is the upper limit determined by the channel capacity

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