Context-Dependent Threshold Decryption and its Applications

Dan Boneh; Benedikt Bünz; Kartik Nayak; Lior Rotem; Victor Shoup

Paper 2025/279

Context-Dependent Threshold Decryption and its Applications

Dan Boneh, Stanford University

Benedikt Bünz, New York University

Kartik Nayak, Duke University

Lior Rotem, Stanford University

Victor Shoup, Offchain Labs

Abstract

We initiate the study of high-threshold public-key decryption, along with an enhanced security feature called context-dependent decryption. Our study includes definitions, constructions, security proofs, and applications. The notion of high-threshold decryption has received almost no attention in the literature. The enhanced security feature of context-dependent encryption is entirely new, and plays an important role in many natural applications of threshold decryption.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
Keywords: Threshold Decryption Atomic Broadcast
Contact author(s): dabo @ cs stanford edu
bb @ nyu edu
kartik @ cs duke edu
lrotem @ cs stanford edu
victor @ shoup net
History: 2025-02-19: approved; 2025-02-18: received; See all versions
Short URL: https://ia.cr/2025/279
License: CC BY

BibTeX

@misc{cryptoeprint:2025/279,
      author = {Dan Boneh and Benedikt Bünz and Kartik Nayak and Lior Rotem and Victor Shoup},
      title = {Context-Dependent Threshold Decryption and its Applications},
      howpublished = {Cryptology {ePrint} Archive, Paper 2025/279},
      year = {2025},
      url = {https://eprint.iacr.org/2025/279}
}