Privacy Preserving Delegated Word Search in the Cloud

Kaoutar Elkhiyaoui, Melek Önen, Refik Molva

2014

Abstract

In this paper, we address the problem of privacy preserving delegated word search in the cloud. We consider a scenario where a data owner outsources its data to a cloud server and delegates the search capabilities to a set of third party users. In the face of semi-honest cloud servers, the data owner does not want to disclose any information about the outsourced data; yet it still wants to benefit from the highly parallel cloud environment. In addition, the data owner wants to ensure that delegating the search functionality to third parties does not allow these third parties to jeopardize the confidentiality of the outsourced data, neither does it prevent the data owner from efficiently revoking the access of these authorized parties. To these ends, we propose a word search protocol that builds upon techniques of keyed hash functions, oblivious pseudo-random functions and Cuckoo hashing to construct a searchable index for the outsourced data, %of distinct words in the encrypted outsourced data, and uses private information retrieval of short information to guarantee that word search queries do not reveal any information about the data to the cloud server. Moreover, we combine attribute-based encryption and oblivious pseudo-random functions to achieve an efficient revocation of authorized third parties. The proposed scheme is suitable for the cloud as it can be easily parallelized.

Paper Citation

in Harvard Style

Elkhiyaoui K., Önen M. and Molva R. (2014). Privacy Preserving Delegated Word Search in the Cloud . In Proceedings of the 11th International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2014) ISBN 978-989-758-045-1, pages 137-150. DOI: 10.5220/0005054001370150

in Bibtex Style

@conference{secrypt14,
author={Kaoutar Elkhiyaoui and Melek Önen and Refik Molva},
title={Privacy Preserving Delegated Word Search in the Cloud},
booktitle={Proceedings of the 11th International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2014)},
year={2014},
pages={137-150},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005054001370150},
isbn={978-989-758-045-1},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 11th International Conference on Security and Cryptography - Volume 1: SECRYPT, (ICETE 2014)
TI - Privacy Preserving Delegated Word Search in the Cloud
SN - 978-989-758-045-1
AU - Elkhiyaoui K.
AU - Önen M.
AU - Molva R.
PY - 2014
SP - 137
EP - 150
DO - 10.5220/0005054001370150