### Abstract

In this work, we construct a short one-out-of-many proof from (module) lattices, allowing one to prove knowledge of a secret associated with one of the public values in a set. The proof system builds on a combination of ideas from the efficient proposals in the discrete logarithm setting by Groth and Kohlweiss (EUROCRYPT ’15) and Bootle et al. (ESORICS ’15), can have logarithmic communication complexity in the set size and does not require a trusted setup. Our work resolves an open problem mentioned by Libert et al. (EUROCRYPT ’16) of how to efficiently extend the above discrete logarithm proof techniques to the lattice setting. To achieve our result, we introduce new technical tools for design and analysis of algebraic lattice-based zero-knowledge proofs, which may be of independent interest. Using our proof system as a building block, we design a short ring signature scheme, whose security relies on “post-quantum” lattice assumptions. Even for a very large ring size such as 1 billion, our ring signature size is only 3 MB for 128-bit security level compared to 216 MB in the best existing lattice-based result by Libert et al. (EUROCRYPT ’16).

Original language | English |
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Title of host publication | Applied Cryptography and Network Security |

Subtitle of host publication | 17th International Conference, ACNS 2019 Bogota, Colombia, June 5–7, 2019 Proceedings |

Editors | Robert H. Deng, Valérie Gauthier-Umaña, Martín Ochoa, Moti Yung |

Place of Publication | Cham Switzerland |

Publisher | Springer |

Pages | 67-88 |

Number of pages | 22 |

ISBN (Electronic) | 9783030215682 |

ISBN (Print) | 9783030215675 |

DOIs | |

Publication status | Published - 2019 |

Event | International Conference on Applied Cryptography and Network Security 2019 - Bogota, Colombia Duration: 5 Jun 2019 → 7 Jun 2019 Conference number: 17th https://www.acns19.com/ |

### Publication series

Name | Lecture Notes in Computer Science |
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Publisher | Springer |

Volume | 11464 |

ISSN (Print) | 0302-9743 |

ISSN (Electronic) | 1611-3349 |

### Conference

Conference | International Conference on Applied Cryptography and Network Security 2019 |
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Abbreviated title | ACNS 2019 |

Country | Colombia |

City | Bogota |

Period | 5/06/19 → 7/06/19 |

Internet address |

### Keywords

- Lattice-based cryptography
- Ring signature
- Zero-knowledge proof

## Cite this

*Applied Cryptography and Network Security: 17th International Conference, ACNS 2019 Bogota, Colombia, June 5–7, 2019 Proceedings*(pp. 67-88). (Lecture Notes in Computer Science ; Vol. 11464 ). Springer. https://doi.org/10.1007/978-3-030-21568-2_4