Paper 2014/989
Controlled Homomorphic Encryption: Definition and Construction
Yvo Desmedt, Vincenzo Iovino, Giuseppe Persiano, and Ivan Visconti
Abstract
In this work we put forth the notion of a Controllable Homomorphic Encryption scheme (CHES), a new primitive that includes features of both FHEs and FunctEs. In a CHES it is possible (similarly to a FHE) to homomorphically evaluate a ciphertext Ct = Enc(m) and a circuit C therefore obtaining Enc(C(m)) but only if (similarly to a FunctE) a token for C has been received from the owner of the secret key. We discuss difficulties in constructing a CHES and then show a construction based on any FunctE. As a byproduct our CHES also represents a FunctE supporting the re-encryption functionality and in that respect improves existing solutions.
Note: In this eprint version we clarify the relation with previous works on functional encryption for randomized functionalities and related primitives
Metadata
- Available format(s)
-
PDF
- Publication info
- Published elsewhere. Minor revision. WAHC '17 (FC Workshop)
- Keywords
- Functional EncryptionNon-malleabilityFully Homomorphic Encryption
- Contact author(s)
- vinciovino @ gmail com
- History
- 2017-02-16: last of 5 revisions
- 2014-12-18: received
- See all versions
- Short URL
- https://ia.cr/2014/989
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2014/989,
author = {Yvo Desmedt and Vincenzo Iovino and Giuseppe Persiano and Ivan Visconti},
title = {Controlled Homomorphic Encryption: Definition and Construction},
howpublished = {Cryptology {ePrint} Archive, Paper 2014/989},
year = {2014},
url = {https://eprint.iacr.org/2014/989}
}
