## Cryptology ePrint Archive: Report 2018/773

Short Lattice-based One-out-of-Many Proofs and Applications to Ring Signatures

Muhammed F. Esgin and Ron Steinfeld and Amin Sakzad and Joseph K. Liu and Dongxi Liu

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).

Category / Keywords: public-key cryptography / lattice-based cryptography, zero-knowledge proof, one-out-of-many proof, ring signature

Original Publication (with major differences): ACNS 2019

Date: received 24 Aug 2018, last revised 15 Apr 2019

Contact author: muhammed esgin at monash edu

Available format(s): PDF | BibTeX Citation

Note: The full version of the paper accepted to ACNS 2019.

Short URL: ia.cr/2018/773

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