Lattice RingCT v2.0 with Multiple Input and Output Wallets

Wilson Alberto Torres; Veronika Kuchta; Ron Steinfeld; Amin Sakzad; Joseph K.  Liu; Jacob Cheng

Paper 2019/569

Lattice RingCT v2.0 with Multiple Input and Output Wallets

Wilson Alberto Torres, Veronika Kuchta, Ron Steinfeld, Amin Sakzad, Joseph K. Liu, and Jacob Cheng

Abstract

This paper presents the Lattice-based Ring Confidential Transactions (Lattice RingCT v2.0) protocol. Unlike the previous Lattice RingCT v1.0 (LRCT v1.0) protocol, the new protocol supports Multiple-Input and Multiple-Output (MIMO) wallets in transactions, and it is a fully functional protocol construction for cryptocurrency applications such as Hcash. Since the MIMO cryptocurrency setting introduces new balance security requirements (and in particular, security against (out-of-range) amount attacks), we give a refined balance security model to capture such attacks, as well as a refined anonymity model to capture amount privacy attacks. Our protocol extends a previously proposed ring signature scheme in the LRCT v1.0 protocol, to support the MIMO requirements while preserving the post-quantum security guarantees, and uses a lattice-based zero-knowledge range proof to achieve security against (out-of-range) attacks. Preliminary parameter estimates and signature sizes are proposed as a point of reference for future studies.

Metadata

Available format(s): PDF
Category: Cryptographic protocols
Publication info: Published elsewhere. Major revision. ACISP2019
Keywords: Cryptocurrencies Lattice-Based Cryptography Post-Quantum Cryptography RingCT
Contact author(s): wil_alberto @ hotmail com
History: 2020-09-16: revised; 2019-05-27: received; See all versions
Short URL: https://ia.cr/2019/569
License: CC BY

BibTeX

@misc{cryptoeprint:2019/569,
      author = {Wilson Alberto Torres and Veronika Kuchta and Ron Steinfeld and Amin Sakzad and Joseph K.  Liu and Jacob Cheng},
      title = {Lattice {RingCT} v2.0 with Multiple Input and Output Wallets},
      howpublished = {Cryptology {ePrint} Archive, Paper 2019/569},
      year = {2019},
      url = {https://eprint.iacr.org/2019/569}
}