Study On Searchable Encryption Schemes

Nowadays, as cloud computing flourishes, cloud storage service has drawn more and more attentions, because it has many benefits including low cost, efficient access, ease of management and easy to share. However, the public storage servers do not ensure the confidentiality, so in fact customers have been trading privacy for the convenience of storage services, which might be intolerable for enterprises and government organizations. Therefore, the security problem becomes the critical factor, which hinders the development of this technology, and the security problem of cloud storage also becomes a research hotspot.The purpose of our work in this paper that offering the clients ability of retrieving information over encrypted data in cloud storage servers. By building encrypted indexes before uploading the documents of clients, we can perform searches without decrypting the documents. During the searching process, there is not too much information leaked to the cloud storage provider.Up to now, there are many searching solutions based on searchable encryption, but they all have some drawbacks in many aspects. We conclude previous works, proposes two solutions according to two common problems. First, in the field of searchable encryption, many schemes can deal with single keyword or multi-keywords, but there is no efficient scheme that can offer phrase search. In this paper, we propose a lightweight phrase search scheme, and we prove it efficient and available. Otherwise, for the higher demand of security, we design another scheme to face the more strict security definition, and we prove the security of this scheme.