### Dynamic Searchable Encryption via Blind Storage

Muhammad Naveed, Manoj Prabhakaran, and Carl A. Gunter

##### Abstract

Dynamic Searchable Symmetric Encryption allows a client to store a dynamic collection of encrypted documents with a server, and later quickly carry out keyword searches on these encrypted documents, while revealing minimal information to the server. In this paper we present a new dynamic SSE scheme that is simpler and more efficient than existing schemes while revealing less information to the server than prior schemes, achieving fully adaptive security against honest-but-curious servers. We implemented a prototype of our scheme and demonstrated its efficiency on datasets from prior work. Apart from its concrete efficiency, our scheme is also simpler: in particular, it does not require the server to support any operation other than upload and download of data. Thus the server in our scheme can be based solely on a cloud storage service, rather than a cloud computation service as well, as in prior work. In building our dynamic SSE scheme, we introduce a new primitive called Blind Storage, which allows a client to store a set of files on a remote server in such a way that the server does not learn how many files are stored, or the lengths of the individual files; as each file is retrieved, the server learns about its existence (and can notice the same file being downloaded subsequently), but the file’s name and contents are not revealed. This is a primitive with several applications other than SSE, and is of independent interest.

Available format(s)
Publication info
Preprint.
Keywords
searchable symmetric encryptionsecure cloud storageencrypted search
Contact author(s)
naveed2 @ illinois edu
History
Short URL
https://ia.cr/2014/219

CC BY

BibTeX

@misc{cryptoeprint:2014/219,
author = {Muhammad Naveed and Manoj Prabhakaran and Carl A.  Gunter},
title = {Dynamic Searchable Encryption via Blind Storage},
howpublished = {Cryptology ePrint Archive, Paper 2014/219},
year = {2014},
note = {\url{https://eprint.iacr.org/2014/219}},
url = {https://eprint.iacr.org/2014/219}
}

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