Access control reinforcement over searchable encryption

Abstract

Ensuring data confidentiality in Cloud Computing is a very challenging task. Encryption is one of the most secure techniques in use for this purpose. However, it remains vulnerable to indiscretions and various attacks. Many flaws appear particularly when searching over data even if the latter are encrypted. In this article, we propose to improve the level of confidentiality of outsourced data. We are particularly interested in reinforcing access control on the search result, when the search is performed over encrypted data. The properly behind this aspect of security is known as ACAS (Access Control Aware Search) principle. We present a hybridization of Searchable Encryption and Attribute Based Encryption methods in order to satisfy ACAS. The efficiency of the proposed model is evaluated according to data size.