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Secure and practical multiparty quantum digital signatures.

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    This study introduces a practical multiparty quantum digital signature (QDS) framework, overcoming limitations of existing protocols. The new approach enhances security and efficiency for mass message transmission in quantum networks.

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    Area of Science:

    • Quantum Information Science
    • Cryptography
    • Network Security

    Background:

    • Quantum digital signatures (QDSs) offer information-theoretic security against message repudiation and forgery.
    • Multiparty QDS protocols are advantageous for mass message transmission but face challenges like complex analysis and low efficiency.

    Purpose of the Study:

    • To propose an effective multiparty QDS framework overcoming limitations of existing three-party protocols.
    • To enhance data utilization efficiency and scalability for multiparty QDS.

    Main Methods:

    • Utilizing a six-state non-orthogonal encoding protocol.
    • Implementing a post-matching method to improve data utilization efficiency.
    • Designing a framework with a linear dependency on the number of users for quantum channels.

    Main Results:

    • The proposed framework reduces the number of quantum channels linearly with the number of users.
    • Data utilization efficiency scales linearly with detection event probability, even in five-party scenarios.
    • Successfully compensates for the lack of practical multiparty QDS protocols.

    Conclusions:

    • The developed multiparty QDS framework offers a practical solution for secure mass message transmission.
    • This work paves the way for the development of future quantum digital signature networks.
    • The protocol demonstrates improved efficiency and scalability compared to previous approaches.