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In a blind signature scheme (BSS), the content of the document is non-intelligible to the signer. This property makes it useful for e-cash, e-voting, block-chain, and other scenarios. Lattice-based schemes provide security against quantum computers. In 2020, Chaoyang Li et al. designed an efficient lattice-based BSS using rejection sampling. In 2023, Fengyin Li et al. designed an ID-based proxy BSS over lattices. Both schemes have been claimed to satisfy blindness by their corresponding authors. In this paper, we analyze these schemes and find that their claim of blindness is not true. So, these digital signatures are no longer blind.

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Cryptanalysis of Some Lattice-Based Blind Signatures

  • 会议论文

  • 发表日期：

    2026年

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  • Ramakant Kumar,
  • Sahadeo Padhye,
  • Navaneet Ojha

摘要

In a blind signature scheme (BSS), the content of the document is non-intelligible to the signer. This property makes it useful for e-cash, e-voting, block-chain, and other scenarios. Lattice-based schemes provide security against quantum computers. In 2020, Chaoyang Li et al. designed an efficient lattice-based BSS using rejection sampling. In 2023, Fengyin Li et al. designed an ID-based proxy BSS over lattices. Both schemes have been claimed to satisfy blindness by their corresponding authors. In this paper, we analyze these schemes and find that their claim of blindness is not true. So, these digital signatures are no longer blind.