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<p>A blind ring signature (BRS) scheme allows any member of a ring to anonymously sign a document without knowing its content. Lattice-based schemes are resistant to quantum computing attacks. In 2022, Xie et al. proposed a lattice-based BRS scheme for blockchain transaction systems. They utilized rejection sampling and bimodal Gaussian distributions. This scheme achieves lower latency and smaller key and signature sizes. The authors claimed that the scheme satisfies anonymity, blindness, and unforgeability. In this article, we analyze this scheme and demonstrate that the blindness property does not hold. We further propose an improved scheme to ensure the blindness property.</p>

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Cryptanalysis of a Lattice-Based Blind Ring Signature Scheme

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Ramakant Kumar,
  • Ajay Dabral,
  • Rohitkumar R. Upadhyay

摘要

A blind ring signature (BRS) scheme allows any member of a ring to anonymously sign a document without knowing its content. Lattice-based schemes are resistant to quantum computing attacks. In 2022, Xie et al. proposed a lattice-based BRS scheme for blockchain transaction systems. They utilized rejection sampling and bimodal Gaussian distributions. This scheme achieves lower latency and smaller key and signature sizes. The authors claimed that the scheme satisfies anonymity, blindness, and unforgeability. In this article, we analyze this scheme and demonstrate that the blindness property does not hold. We further propose an improved scheme to ensure the blindness property.