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On the composable security of weak coin flipping

23 February 2024
Jiawei Wu
Yanglin Hu
Akshay Bansal
Marco Tomamichel
ArXiv (abs)PDFHTML
Main:16 Pages
11 Figures
Bibliography:3 Pages
Appendix:10 Pages
Abstract

Weak coin flipping is a cryptographic primitive in which two mutually distrustful parties generate a shared random bit to agree on a winner via remote communication. While a stand-alone secure weak coin flipping protocol can be constructed from noiseless quantum communication channels, its composability remains unexplored. In this work, we demonstrate that no weak coin flipping protocol can be abstracted as a simple black-box resource with composable security. Despite this, we also establish the overall stand-alone security of quantum weak coin flipping protocols under composition in sequential order.

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@article{wu2025_2402.15233,
  title={ On the composable security of weak coin flipping },
  author={ Jiawei Wu and Yanglin Hu and Akshay Bansal and Marco Tomamichel },
  journal={arXiv preprint arXiv:2402.15233},
  year={ 2025 }
}
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