Secure search over encrypted data in cloud computing

Abstract

Nowadays cloud computing is widely used by users and organization to get benefit of many services in cloud. Huge datasets in cloud persuade users to outsource their information and documents to the untrusted Cloud Service Provider (CSP). On the other hand, there are some privacy and security problems in cloud storage considering as main drawbacks of extending it among users. One of the solutions for providing confidentiality of data in cloud storage is encrypting data before sending to cloud. This satisfies data confidentiality and makes users feel more confidence on the CSP. However, this prevents user to search the outsourced documents directly. Regular encryption algorithms such as AES, RC4 and DES mechanisms have searching limitation, in which the whole ciphertext needs to be retrieved and then decrypt before search procedure can be performed. Recently a lot of research has been done to enable search capabilities for users. Generally, keyword based search approach is used. This approach allows users to retrieve just those documents contain special keywords. However, searchable encryption algorithms suffer from privacy and security problems. This paper proposes Secure Searchable Based Asymmetric Encryption (SSAE) algorithm that provides Indistinguishability under Adaptive-Chosen Ciphertext Attack. The proposed searchable encryption algorithm is mathematically proven secure and it has the ability to perform a search within encrypted data without decrypting them.