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<p>Digital signatures are one of the most basic cryptographic building blocks, which are utilized to provide attractive security features such as authenticity, unforgeability, and undeniability. To make public key infrastructure more simple and to circumvent the need for certificates, Shamir in 1984 developed the first identity-based signature (IBS). Nearly all of the existing IBS protocols rely on number theoretic assumption-based hard problems. Unfortunately, these hard problems are insecure and face a threat in the quantum world. Thus, it is high time we designed IBS algorithms that can resist quantum attacks and provide long-term security. Quantum cryptography (QC) is one such technique. In this paper, we design an IBS based on QC. The security of our scheme depends on the principle of quantum mechanics and quantum computing. As a consequence, it attains long-term security and remains secure against quantum attacks. We verified the correctness and feasibility of the proposed design by simulating it in a prototype quantum device and the IBM Qiskit quantum simulator.</p>

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An experimentally validated feasible quantum protocol for identity-based signature

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Tapaswini Mohanty,
  • Vikas Srivastava,
  • Sumit Kumar Debnath,
  • Debasish Roy,
  • Kouichi Sakurai,
  • Sourav Mukhopadhyay

摘要

Digital signatures are one of the most basic cryptographic building blocks, which are utilized to provide attractive security features such as authenticity, unforgeability, and undeniability. To make public key infrastructure more simple and to circumvent the need for certificates, Shamir in 1984 developed the first identity-based signature (IBS). Nearly all of the existing IBS protocols rely on number theoretic assumption-based hard problems. Unfortunately, these hard problems are insecure and face a threat in the quantum world. Thus, it is high time we designed IBS algorithms that can resist quantum attacks and provide long-term security. Quantum cryptography (QC) is one such technique. In this paper, we design an IBS based on QC. The security of our scheme depends on the principle of quantum mechanics and quantum computing. As a consequence, it attains long-term security and remains secure against quantum attacks. We verified the correctness and feasibility of the proposed design by simulating it in a prototype quantum device and the IBM Qiskit quantum simulator.