A Based On Blinded CP-ABE Searchable Encryption Cloud Storage Service Scheme

With the rapid development of Internet technology and the Increasingly mature of cloud computing technology,the development of technology has evolved from the information technology(IT)to the data technology(DT)of today.The rapid growth of a large amount of data in people's lives,the powerful computing search capability and cheap even free storage space of cloud servers.Make more and more individuals and enterprises choose store the data to the cloud server,so a higher requirements for cloud storage service mechanisms been put forward.Cloud storage is different from a traditional way of data storage,users lose the physical control of stored data.Once uploading data to the cloud server,users can't modify and maintain their data.And the cloud server is semi-trusted,illegal users can use the cloud server to get the uploaded data information.In order to solve this problem,many schemes implement data encrypted upload,which ensures data security,but it brings great difficulty in data sharing and ciphertext search.The main research contents are as follows:(1)In order to solve the problem of convenient use and efficient sharing of data in cloud servers,this thesis adopts searchable encryption technology to ensure the safety and availability of uploaded data.At the same time,adopts the ciphertext-policy attribute-based encryption technology to achieve fine-grained access control data.And the attribute is corresponding blinded,so that a malicious attacker can not get any attribute related data information,which makes the access control mechanism more secure and reliable.(2)In this thesis,the data can be encrypted search,also supports the data fine-grained access control and the coexistence of multiple data owners and multiple data users.In order to solve the problem of data user's expensive decryption and computation cost,the scheme performs pre-decryption operation in cloud server.Data users can perform the final simple decryption operation to obtain the relevant plaintext information.(3)Finally,through the comparison and analysis of the experiment,it is concluded that the scheme is effective in practice and is safe and reliable in the random oracle model.The research results in this thesis have theoretical guiding significance for the research of attribute-based access control and searchable encryption mechanism in cloud storage environment.