Paper 2024/1779
Ciphertext-Policy ABE from Inner-Product FE
Abstract
The enormous potential of Attribute-Based Encryption (ABE) in the context of IoT has driven researchers to propose pairing-free ABE schemes that are suitable for resource-constrained devices. Unfortunately, many of these schemes turned out to be insecure. This fact seems to reinforce the point of view of some authors according to which instantiating an Identity-Based Encryption (IBE) in plain Decisional Diffie-Hellman (DDH) groups is impossible. In this paper, we provide a generic AND gate access structured Ciphertext-Policy ABE (CP-ABE) scheme with secret access policy from Inner-Product Functional Encryption (IPFE). We also propose an instantiation of that generic CP-ABE scheme from the DDH assumption. From our generic CP-ABE scheme we derive an IBE scheme by introducing the concept of Clustered Identity-Based Encryption (CIBE). Our schemes show that it is indeed possible to construct practical and secure IBE and ABE schemes based on the classical DDH assumption. An implementation of our CIBE in Python using the Charm framework is available on GitHub [21].
Metadata
- Available format(s)
-
PDF
- Category
- Public-key cryptography
- Publication info
- Preprint.
- Keywords
- Identity-Based EncryptionAttribute-Based EncryptionInner-Product Functional EncryptionDecisional Diffie-Hellman.
- Contact author(s)
- ahmadkhoureich ka @ uadb edu sn
- History
- 2025-05-07: last of 3 revisions
- 2024-10-31: received
- See all versions
- Short URL
- https://ia.cr/2024/1779
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2024/1779,
author = {Ahmad Khoureich Ka},
title = {Ciphertext-Policy {ABE} from Inner-Product {FE}},
howpublished = {Cryptology {ePrint} Archive, Paper 2024/1779},
year = {2024},
url = {https://eprint.iacr.org/2024/1779}
}