Research On Technology Of Online/Offline Attribute-based Searchable Encryption

As the rapid development of the new network configuration and network services such as the mobile Internet,cloud computing,big data and so on.More and more companies and individuals will store the sensitive data on third-party data service organization for sharing by remote and outsourcing computation,etc.The data storage and processing from the original local to the remote of the cloud,but the cloud is not a completely trusted third-party server,we often have to encrypt the data before using the cloud service,then how to achieve remote access control and the data retrieval on the ciphertext became the research hotspot in recent years.Around attribute-based encryption scheme and public-key searchable encryption,the main research work of the present thesis is as follows:1.This paper proposes an online / offline attribute-based encryption scheme with outsouring decryption.The scheme divides the encryption into two phases by the idea of online / offline distributed encryption,then over 99% of the work for encryption from the online phase to the offline phase to complete.Meanwhile,the scheme converts the attribute-based ciphertext into short ciphertext by the idea of outsourcing decryption,and then outsourcing the bilinear pairing operations for decryption to the cloud server for calculating,making the construction of the scheme more secure and efficient.2.The present thesis first introduces a kind of attribute-based encryption scheme supporting keyword search and then improves the above scheme based on the idea of the online / offline attribute-based encryption scheme with outsourcing decryption,this paper proposes a concept of online/offline attribute-based searchable encryp-tion scheme,which not only can implement the control of the data user's search permission and the keyword search on the encrypted data,but also can minimize the decryption computational cost of the data users and the online computational cost of the data owner.3.For online/offline attribute-based searchable encryption scheme,this paper presents a specific application scenario.Combined with the scene of mobile devices sharing data in the cloud,the description of the algorithm in each stage is given.And the analysis of the security and efficiency of the scheme shows that the scheme is feasible in practical applications.