A Framework for Advanced Signature Notions

Patrick Struck; Maximiliane Weishäupl

Paper 2025/960

A Framework for Advanced Signature Notions

Patrick Struck

, University of Konstanz

Maximiliane Weishäupl, University of Regensburg

Abstract

The beyond unforgeability features formalize additional security properties for signature schemes. We develop a general framework of binding properties for signature schemes that encompasses existing beyond unforgeability features and reveals new notions. Furthermore, we give new results regarding various transforms: We show that the transform by Cremers et al. (SP’21) achieves all of our security notions; we give a modified definition of so-called weak keys, and show that the Pornin–Stern transform (ACNS’05) also achieves all notions if there are no weak keys. Finally, we connect our framework to unforgeability notions.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: A minor revision of an IACR publication in PKC 2026
Keywords: Signature schemes Beyond Unforgeability BUFF
Contact author(s): Patrick struck @ uni kn
maximiliane weishaeupl @ ur de
History: 2026-02-27: revised; 2025-05-26: received; See all versions
Short URL: https://ia.cr/2025/960
License: CC BY

BibTeX

@misc{cryptoeprint:2025/960,
      author = {Patrick Struck and Maximiliane Weishäupl},
      title = {A Framework for Advanced Signature Notions},
      howpublished = {Cryptology {ePrint} Archive, Paper 2025/960},
      year = {2025},
      url = {https://eprint.iacr.org/2025/960}
}