SPURT: Scalable Distributed Randomness Beacon with Transparent Setup

Speaker: Ling Ren , UIUC

Date: Thursday, March 04, 2021

Time: 1:00 PM to 2:00 PM Note: all times are in the Eastern Time Zone

Public: Yes

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Event Type: Seminar

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Host: Srini Devadas, CSAIL

Contact: Kyle L Hogan, klhogan@csail.mit.edu

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Reminders to: seminars@csail.mit.edu, renling@illinois.edu

Reminder Subject: TALK: SPURT: Scalable Distributed Randomness Beacon with Transparent Setup

Abstract:
Having shared access to high-quality random numbers is essential in many important applications. Yet, existing constructions of distributed random beacons still have limitations such as imperfect security guarantees, strong setup or network assumptions, or high costs. In this paper, we present SPURT, an efficient distributed randomness beacon protocol that does not require any trusted
or expensive setup and is secure against a malicious adversary that controls up to one-third of the nodes in a partially synchronous network. We formally prove that each output of SPURT is unpredictable, bias-resistant, and publicly verifiable.
SPURT has an amortized total communication cost of $O(\lambda n^2)$ per beacon output in the fault-free case and $O(\lambda n^2\log n + n^3)$ in the worst case. We implement SPURT and evaluate it using a network of up to 128 nodes running in geographically distributed AWS instances. Our evaluation shows that SPURT has practical computation and bandwidth costs and can produce beacon outputs every second for a network of 64 nodes, and every 3 seconds for a network of 128 nodes.

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Research Areas:
Security & Cryptography

Impact Areas:
Cybersecurity

See other events that are part of the CSAIL Security Seminar Series 2021.

Created by Kyle L Hogan Email at Thursday, February 25, 2021 at 3:06 PM.