Cryptology ePrint Archive: Report 2019/1227

Dynamic Searchable Encryption with Small Client Storage

Ioannis Demertzis and Javad Ghareh Chamani and Dimitrios Papadopoulos and Charalampos Papamanthou

Abstract: We study the problem of dynamic searchable encryption (DSE) with forward-and-backward privacy. Many DSE schemes have been proposed recently but the most efficient ones have one limitation: they require maintaining an operation counter for each unique keyword, either stored locally at the client or accessed obliviously (e.g., with an oblivious map) at the server, during every operation. We propose three new schemes that overcome the above limitation and achieve constant permanent client storage with improved performance, both asymptotically and experimentally, compared to prior state-of-the-art works. In particular, our first two schemes adopt a “static-to-dynamic” transformation which eliminates the need for oblivious accesses during searches. Due to this, they are the first practical schemes with minimal client storage and non-interactive search. Our third scheme is the first quasi-optimal forward-and-backward DSE scheme with only a logarithmic overhead for retrieving the query result (independently of previous deletions). While it does require an oblivious access during search in order to keep permanent client storage minimal, its practical performance is up to four orders of magnitude better than the best existing scheme with quasi-optimal search.

Category / Keywords: cryptographic protocols / dynamic searchable encryption, forward and backward privacy

Date: received 18 Oct 2019

Contact author: yannis at umd edu, demertzis1990 at gmail com, cpap at umd edu, dipapado at cse ust hk, jgc at cse ust hk

Available format(s): PDF | BibTeX Citation

Version: 20191021:082201 (All versions of this report)

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