Public-coin Differing-input Obfuscation from KOALA and iO

Liyan Chen; Vinod Vaikuntanathan

Paper 2026/2346

Public-coin Differing-input Obfuscation from KOALA and iO

Liyan Chen

, Massachusetts Institute of Technology

Vinod Vaikuntanathan

, Massachusetts Institute of Technology

Abstract

We show that the recent construction of witness encryption (Hair and Sahai, arXiv:2609.18275v1) is a public-coin extractable witness encryption scheme under the Knowledge of Orthogonality Assumption, or KOALA for short (Buellens-Wee, PKC 2019). As an immediate application, we obtain public-coin differing-input obfuscation (diO) from KOALA and indistinguishability obfuscation (iO).

Metadata

Available format(s): PDF
Category: Foundations
Publication info: Preprint.
Keywords: Witness Encryption Obfuscation
Contact author(s): cliyan @ mit edu
vinodv @ csail mit edu
History: 2026-10-07: approved; 2026-10-05: received; See all versions
Short URL: https://ia.cr/2026/2346
License: CC BY-NC-SA

BibTeX

@misc{cryptoeprint:2026/2346,
      author = {Liyan Chen and Vinod Vaikuntanathan},
      title = {Public-coin Differing-input Obfuscation from {KOALA} and {iO}},
      howpublished = {Cryptology {ePrint} Archive, Paper 2026/2346},
      year = {2026},
      url = {https://eprint.iacr.org/2026/2346}
}