Secure and Efficient Quantum Signature Scheme Based on the Controlled Unitary Operations Encryption

TL;DR

This paper introduces a new quantum signature protocol using chained controlled unitary operations, enhancing security and efficiency over traditional methods like QOTP, and preventing disavowal and forgery attacks.

Contribution

The paper proposes a novel AQS protocol based on chained controlled unitary operations, improving security against attacks compared to existing QOTP-based schemes.

Findings

Prevents disavowal and forgery attacks effectively.

Offers an efficient alternative to QOTP for quantum message encryption.

Contributes to advancing secure quantum communication protocols.

Abstract

Quantum digital signatures ensure unforgeable message authenticity and integrity using quantum principles, offering unconditional security against both classical and quantum attacks. They are crucial for secure communication in high-stakes environments, ensuring trust and long-term protection in the quantum era. Nowadays, the majority of arbitrated quantum signature (AQS) protocols encrypt data qubit by qubit using the quantum one-time pad (QOTP). Despite providing robust data encryption, QOTP is not a good fit for AQS because of its susceptibility to many types of attacks. In this work, we present an efficient AQS protocol to encrypt quantum message ensembles using a distinct encryption technique, the chained controlled unitary operations. In contrast to existing protocols, our approach successfully prevents disavowal and forgery attacks. We hope this contributes to advancing future investigations into the development of AQS protocols.