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A Fiat–Shamir Transformation from Duplex Sponges

  • 2026
  • OriginalPaper
  • Chapter
Published in:
Authors
Alessandro Chiesa
Michele Orrù
Published in
Theory of Cryptography
Publisher
Springer Nature Switzerland

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Abstract

This chapter delves into a variant of the Fiat–Shamir transformation that leverages duplex sponges, a permutation-based cryptographic approach. The text highlights the transformation's efficiency and security, providing a rigorous analysis that bridges the gap between theoretical models and practical implementations. It introduces a new variant aimed at closely modeling deployed variants, addressing the security gap between theoretical analyses and practical implementations. The chapter also discusses the transformation's application to the BCS transformation, enhancing its efficiency and security. Additionally, it explores the implementation of the transformation in Rust, offering a flexible library for practitioners. The text concludes with a discussion on open problems and related work, providing a comprehensive overview of the current state and future directions in this field.
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previous chapter SNARK Lower Bounds via Communication Complexity
Title
A Fiat–Shamir Transformation from Duplex Sponges
Authors
Alessandro Chiesa
Michele Orrù
Copyright Year
2026
Book
Theory of Cryptography

Print ISBN: 978-3-032-12286-5

Electronic ISBN: 978-3-032-12287-2

Copyright Year: 2026

DOI
https://doi.org/10.1007/978-3-032-12287-2_16
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