Paper 2026/127 Original: eprint.iacr.org/2026/127 ↗
Toward Verifiable Privacy in Decentralized Identity: A Formal Framework for Minimal Disclosure and Unlinkability
Abstract
This paper presents a formal framework for decentralized identity (DID), which achieves both minimal disclosure and session unlinkability under public verifiability. We instantiate this framework as PrivDID. In PrivDID, a user can prove a predicate about a committed attribute via a single ring signature, thereby hiding in an anonymity set dynamically selected from the public ledger. PrivDID builds on Pedersen commitments and binary-range encodings, and is proven secure in the random oracle model. It is fully W3C-compliant and requires no trusted setup. Implementation shows practical efficiency in storage, communication, and computation, confirming real-world feasibility.
Metadata
- Available format(s)
PDF- Category
- Applications
- Publication info
- Preprint.
- History
- 2026-01-27: last updated
- 2026-01-27: published
- Short URL
- https://ia.cr/2026/127
- License
- https://creativecommons.org/licenses/by-nc-nd/4.0/
BibTeX
@misc{cryptoeprint:2026/127,
author = {Yu Zhang and Zongbin Wang},
title = {Toward Verifiable Privacy in Decentralized Identity: A Formal Framework for Minimal Disclosure and Unlinkability},
howpublished = {Cryptology {ePrint} Archive, Paper 2026/127},
year = {2026},
url = {https://eprint.iacr.org/2026/127}
}