Efficient and Secure Data Retrieval Scheme Using Searchable Encryption in Cloud Storage

摘要

In the new era of data explosion, the problem of data storage and portability were solved with the advent of the cloud technologies. But the attendant problem is that most of the data stored by users are always uploaded as the form of plaintext, this means that the more data and information are uploaded by the user in cloud, the more privacy and information security risks will be. This paper presents a data retrieval system by using public key encryption system with keyword search, in which the client could test whether or not the file stored in cloud server contains the keyword without leaking the information about the encrypted file. We apply asymmetric pairings to achieve shorter key size scheme in the standard model, and adopt the dual system encryption technique to reduce the scheme's secure problem to the hard Symmetric External Diffie-Hellman assumption. In the last of paper, we analyse the scheme's efficiency and point out that our scheme is more efficient and secure than some other classical data retrieval models.