SodsBC/SodsBC++ & SodsMPC: Post-quantum Asynchronous Blockchain Suite for Consensus and Smart Contracts

Shlomi Dolev, Ziyu Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

SodsBC is the first asynchronous permissioned blockchain consensus (asynchronous BFT, aBFT in short) utilizing the concurrent preprocessing model to achieve post-quantum security while keeping high performance simultaneously. SodsBC concurrently preprocesses common random coins (from a global secret sharing pool) for the consensus necessary randomness usage, and also preprocesses symmetric encryption keys for considerable censorship resilience. The finalization of a stage of the global secret sharing pool utilizes the aBFT itself, as a transaction in the new block. SodsBC (and its followed work SodsBC++) is faster than the quantum-sensitive aBFT competitors. SodsMPC is a post-quantum smart contract system, in which all participants execute a contract by secure multi-party computation (MPC) protocols. MPC ensures the contract execution correctness while keeping the data privacy. Moreover, SodsMPC expresses the logic of a contract by a blind polynomial with secret-shared coefficients, and utilizes a finite state machine (FSM) to simplify the blind polynomial for better efficiency. When using MPC to compute this blind polynomial, the contract business logic privacy is obtained. SodsMPC participants also preprocess random permutation matrices to hide the real contract input relation, which protects the contract user anonymous identity.

Original languageEnglish
Title of host publicationStabilization, Safety, and Security of Distributed Systems - 23rd International Symposium, SSS 2021, Proceedings
EditorsColette Johnen, Elad Michael Schiller, Stefan Schmid
PublisherSpringer Science and Business Media Deutschland GmbH
Pages510-515
Number of pages6
ISBN (Print)9783030910808
DOIs
StatePublished - 1 Jan 2021
Event23rd International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2021 - Virtual, Online
Duration: 17 Nov 202120 Nov 2021

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume13046 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference23rd International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2021
CityVirtual, Online
Period17/11/2120/11/21

Keywords

  • Asynchrony
  • Blockchain
  • Post-quantum
  • Smart Contract

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science

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