Researches On Searchable Encryption Technology Based On Cloud Storage

The development of cloud computing and electronic business has caused the generation of mass data,which makes these outsourced data stored in cloud severs a promising trend.However,this trend has brought a challenge of how to guarantee the security and integrity of data stored in the cloud.These data are probably faced with risks of spied and revealed by some honest but curious cloud severs.Consequently,a prevalent approach is utilized by encrypting these data before outsourcing them to the cloud.Though the traditional encryption technology can ensure the confidentiality and integrity of data,with a large amount of data being uploaded to the cloud,a new problem came into being: how to achieve a direct and effective search on these encrypted data without frequent encryption and description.So the concept of “searchable encryption” was put forward to address this problem,which can not only guarantee the security of data,but also achieve an available search on encrypted data.This dissertation first investigates the symmetric searchable encryption and proposes a multi-keyword multi-user searchable encryption scheme based on bilinear pairing mapping.This scheme is realized through secure interactions between authorized users and cloud severs by designing a new index structure which can ensure the confidentiality and integrity of data.And meanwhile,our proposal achieves the dynamic controllability of authorized users and encrypted data.Second,multi-sever searchable encryption model is investigated.For this issue,a multi-sever multi-keyword searchable encryption scheme is proposed based on cloud storage.Data owners expect that their data files can be partitioned and stored to multiple cloud severs with the form of ciphertext,so as to improve the searching efficiency of authorized users and the processing ability of big data.Compared with the single sever searchable encryption,this proposal can not only guarantee the data security,but also provide higher retrieval efficiency service.Simulation experiments for the two schemes and demo for the second scheme are implemented,and compared with other schemes,experiment results show that the retrieval performances of our proposals have been improved on the premise that the security can be ensured,and the computation of trapdoor generation also has been improved.