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Bibliographic Details
Main Authors: Chaoui, Ziad, Pappa, Anna, Rosati, Matteo
Format: Preprint
Published: 2025
Subjects:
Online Access:https://arxiv.org/abs/2501.07351
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Table of Contents:
  • Bit commitment is a fundamental cryptographic primitive and a cornerstone for numerous two-party cryptographic protocols, including zero-knowledge proofs. However, it has been proven that unconditionally secure bit commitment, both classical and quantum, is impossible. In this work, we demonstrate that imposing a restriction on the committing party to perform only separable operations enables secure quantum bit commitment schemes. Specifically, we prove that in any perfectly hiding bit commitment protocol, an honestly-committing party limited to separable operations will be detected with high probability if they attempt to alter their commitment. To illustrate our findings, we present an example protocol.