Searchable encryption is a technique that allows a client to store documents on a server in encrypted form. Stored documents can be retrieved selectively while revealing as little information as possible to the server. In the symmetric searchable encryption domain, the storage and the retrieval are performed by the same client. Most conventional searchable encryption schemes suffer from two disadvantages. First, searching the stored documents takes time linear in the size of the database, and/or uses heavy arithmetic operations. Secondly, the existing schemes do not consider adaptive attackers; a search-query will reveal information even about documents stored in the future. If they do consider this, it is at a significant cost to updates. In this paper we propose a novel symmetric searchable encryption scheme that offers searching at constant time in the number of unique keywords stored on the server. We present two variants of the basic scheme which differ in the efficiency of search and update. We show how each scheme could be used in a personal health record system.
|Place of Publication||Enschede|
|Publisher||Distributed and Embedded Security (DIES)|
|Number of pages||17|
|Publication status||Published - 27 Apr 2009|
|Name||CTIT Technical Report Series|
|Publisher||Centre for Telematics and Information Technology, University of Twente|
- Searchable Encryption
- Efficient Update
- Efficient Search
Sedghi, S., van Liesdonk, P., Doumen, J. M., Hartel, P. H., & Jonker, W. (2009). Adaptively Secure Computationally Efficient Searchable Symmetric Encryption. (CTIT Technical Report Series; No. TR-CTIT-09-13). Enschede: Distributed and Embedded Security (DIES).