An efficient and provably secure arbitrated quantum signature scheme

TL;DR

This paper introduces an efficient, secure arbitrated quantum signature scheme that allows long-term key sharing between parties, reducing the need for repeated quantum key distribution, and is proven to be secure.

Contribution

It presents a novel quantum signature scheme combining quantum and classical cryptography with long-term key sharing, enhancing efficiency and security.

Findings

The scheme is proven to be secure against various attacks.

It reduces the frequency of quantum key distribution.

The scheme is more efficient than previous quantum signature protocols.

Abstract

In this paper, an efficient arbitrated quantum signature scheme is proposed by combining quantum cryptographic techniques and some ideas in classical cryptography. In the presented scheme, the signatory and the receiver can share a long-term secret key with the arbitrator by utilizing the key together with a random number. While in previous quantum signature schemes, the key shared between the signatory and the arbitrator or between the receiver and the arbitrator could be used only once, and thus each time when a signatory needs to sign, the signatory and the receiver have to obtain a new key shared with the arbitrator through a quantum key distribution protocol. Detailed theoretical analysis shows that the proposed scheme is efficient and provably secure.