An Efficient FHE Scheme to Secure Cloud Computing

Khalil Hariss, Abed Ellatif Samhat, Maroun Chamoun

2019

Abstract

In this paper, we consider the privacy issue in cloud systems by using Homomorphic Encryption (HE) to provide secure computing at the cloud side. We use Domingo Ferrer (DF) homomorphic scheme to accomplish this task. Before implementing DF in a cloud scenario, we resolve its main problems. The two concerned problems are sensitivity to known plain-text attack and cipher-text dimension growth after homomorphic multiplication causing high storage overhead and reducing the scheme efficiency. DF is first made secure for cloud systems by making the scheme much more resistant to the concerned attack due to the change of the encryption procedure. Second, DF is made efficient for cloud computing by introducing a new technique, called Key Switching (KS). This technique reduces the high overhead by decreasing the extended cipher-text dimension obtained after a homomorphic multiplication and preserving the homomorphic behavior. While users’ privacy at the Cloud side is preserved with HE, KS technique relies on publishing a matrix M. Different secret keys are encrypted within M based on the hardness of Learning With Error (LWE). A deep crypt-analysis and implementations under Python using SageMath Library are done in order to validate the efficiency of our proposal.

Paper Citation

in Harvard Style

Hariss K., Samhat A. and Chamoun M. (2019). An Efficient FHE Scheme to Secure Cloud Computing.In Proceedings of the 16th International Joint Conference on e-Business and Telecommunications - Volume 2: SECRYPT, ISBN 978-989-758-378-0, pages 341-349. DOI: 10.5220/0007788803410349

in Bibtex Style

@conference{secrypt19,
author={Khalil Hariss and Abed Samhat and Maroun Chamoun},
title={An Efficient FHE Scheme to Secure Cloud Computing},
booktitle={Proceedings of the 16th International Joint Conference on e-Business and Telecommunications - Volume 2: SECRYPT,},
year={2019},
pages={341-349},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007788803410349},
isbn={978-989-758-378-0},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 16th International Joint Conference on e-Business and Telecommunications - Volume 2: SECRYPT,
TI - An Efficient FHE Scheme to Secure Cloud Computing
SN - 978-989-758-378-0
AU - Hariss K.
AU - Samhat A.
AU - Chamoun M.
PY - 2019
SP - 341
EP - 349
DO - 10.5220/0007788803410349