Research On Attribute-Based Ciphertext Retrieval In Cloud Environment

With the rapid development of Cloud technology,Cloud storage services became more and more mature,storing data in the Cloud is used in more enterprises or individuals to reduce management overheads.But if the user upload data to the Cloud,they will lose the control rights of data,and case a large area of users' data leakage events occurring.Cloud data security is paid more attention,the user is more inclined to upload the data to the Cloud after encrypt it.But the encrypted data has lost its original structure and semantic features,the user how to facilitate and efficient retrieval become the focus of the study.Aiming at the above problems,this paper studies the encryption and retrieval of ciphertext in Cloud environment,and constructs the scheme.Works are as follows:(1)Explain the characteristics of Cloud storage,explore a series of security issues which facing in Cloud storage,and analyze the current searchable encryption scheme.Searchable encryption is a special encryption technology that enables users to search keyword in ciphertexts,solve the difficult problem of searching encrypted data in particular environment,and ensure that third parties can not obtain any information.(2)Combine keyword search encryption and attribute-based encryption to efficiently search encrypted data in the Cloud environment to solve the multi-users accessing control problem,so that the ciphertext information can be shared and save the third parties storage space.Meeting the relevant attributes of the user can query the encrypted data to adapt to the Cloud storage environment,this special application scenarios.By adding a ciphertext attribute-based encryption(CP-ABE),the scheme is changed from a "one-to-one" model to a "one-to-many" mode,which is more applicable to the current Cloud storage environment.(3)Combine searchable symmetric encryption and public key encryption,construct the use of XOR operation attribute-based on the keywords search public key encryption scheme,use symmetric encryption in the keyword encryption and trap generation stage,reduce the use of bilinear and the number of integer arithmetic operations,achieve keyword search with pseudo-random function and XOR operation to ensure safety and do not affect the retrieval function to reduce the complexity and improve efficiency.