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Unconditionally secure relativistic multi-party biased coin flipping and die rolling

Published version
Peer-reviewed

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Authors

Pitalúa-García, Damián  ORCID logo  https://orcid.org/0000-0002-7579-578X

Abstract

We introduce relativistic multi-party biased die-rolling protocols, generalizing coin flipping to M≥2 parties and to N≥2 outcomes for any chosen outcome biases and show them unconditionally secure. Our results prove that the most general random secure multi-party computation, where all parties receive the output and there is no secret input by any party, can be implemented with unconditional security. Our protocols extend Kent’s (Kent A. 1999 Phys. Rev. Lett. 83, 5382) two-party unbiased coin-flipping protocol, do not require any quantum communication, are practical to implement with current technology and to our knowledge are the first multi-party relativistic cryptographic protocols.

Description

Keywords

Research articles, multi-party, coin flipping, die rolling, relativistic cryptography, unconditional security, quantum cryptography

Journal Title

Proceedings of the Royal Society A

Conference Name

Journal ISSN

1364-5021
1471-2946

Volume Title

477

Publisher

The Royal Society Publishing
Sponsorship
UK Quantum Communications Hub (EP/T001011/1)