[Resource Topic] 2021/545: MatRiCT+: More Efficient Post-Quantum Private Blockchain Payments

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MatRiCT+: More Efficient Post-Quantum Private Blockchain Payments

Authors: Muhammed F. Esgin, Ron Steinfeld, Raymond K. Zhao


We introduce MatRiCT+, a practical private blockchain payment protocol based on post-quantum'' lattice assumptions. MatRiCT+ builds on MatRiCT due to Esgin et al. (ACM CCS'19) and, in general, follows the Ring Confidential Transactions (RingCT) approach used in Monero, the largest privacy-preserving cryptocurrency. In terms of the practical aspects, MatRiCT+ has 2-18x shorter proofs (depending on the number of input accounts, M) and runs 3-11x faster (for a typical transaction) in comparison to MatRiCT. A significant advantage of MatRiCT+ is that the proof length's dependence on M is very minimal (only O(log M)), while MatRiCT has a proof length linear in M. To support its efficiency, we devise several novel techniques in our design of MatRiCT+ to achieve compact lattice-based zero-knowledge proof systems, exploiting the algebraic properties of power-of-2 cyclotomic rings commonly used in practical lattice-based cryptography. Along the way, we design a family of optimal’’ challenge spaces, using a technique we call partition-and-sample, with minimal \ell_1-norm and invertible challenge differences (with overwhelming probability), while supporting highly-splitting power-of-2 cyclotomic rings. We believe all these results to be widely applicable and of independent interest.

ePrint: https://eprint.iacr.org/2021/545

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