Paper 2025/1567
Bootstrappable Fully Homomorphic Attribute-Based Encryption with Unbounded Circuit Depth
Abstract
Homomorphic attribute-based encryption (HABE) is a useful cryptographic primitive that supports both fine-grained access control and computation over ciphertexts. However, existing HABE schemes are limited to the homomorphic evaluation of circuits with either bounded depth or a restricted number of inputs. To address this problem, we introduce a bootstrappable, fully homomorphic attribute-based encryption (FHABE) scheme that supports computations of circuits with unbounded depth over cross-attribute ciphertexts. Compared to state-of-the-art schemes, the proposed scheme also has a more lightweight ciphertext and eliminates the reliance on the random oracle model. Additionally, we extend the FHABE to a proxy re-encryption setting, proposing an attribute-based homomorphic proxy re-encryption scheme that facilitates efficient sharing of encrypted data. This scheme is the first lattice-based multi-hop attribute-based proxy re-encryption scheme with unbounded hops of re-encryptions, which may be of independent interest.
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- A minor revision of an IACR publication in ASIACRYPT 2025
- Keywords
- Attribute-based encryptionHomomorphic encryptionUnbounded depthBootstrappingProxy re-encryption
- Contact author(s)
-
fxzhao37 @ gmail com
ceciliachan9710 @ gmail com
mhaau @ polyu edu hk
cryptjweng @ gmail com
hxwang @ ntu edu sg
guojian @ ntu edu sg - History
- 2025-09-04: last of 2 revisions
- 2025-09-01: received
- See all versions
- Short URL
- https://ia.cr/2025/1567
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2025/1567,
author = {Feixiang Zhao and Shixin Chen and Man Ho Au and Jian Weng and Huaxiong Wang and Jian Guo},
title = {Bootstrappable Fully Homomorphic Attribute-Based Encryption with Unbounded Circuit Depth},
howpublished = {Cryptology {ePrint} Archive, Paper 2025/1567},
year = {2025},
url = {https://eprint.iacr.org/2025/1567}
}
