Research On Attribute Based Searchable Encryption Mechanism In Cloud Storage

Attribute based searchable encryption technology supports "one to many" application environment,which can better solve the problems encountered in cloud storage server,such as distribution key management,fine-grained management,good privacy of data,efficient and real-time access control for shared table users,and better solve the problem of ciphertext search.In this paper,two kinds of searchable encryption schemes based on attributes are proposed to solve the problems of flexibility of search strategy and efficient retrieval in cloud ciphertext search.The main work and innovation of this paper are as follows:(1)An attribute based searchable encryption scheme is proposed to support keyword updating.Aiming at the problem of updating file index,this scheme selects tree access structure,uses the Boolean filter with counter to process the keywords contained in the file,allows users to dynamically modify the keywords in the index ciphertext,tightens the association between the file and the file index,and improves the retrieval efficiency but also has IND-CKA security and trapdoor security under the standard mode and has certain advantages in efficiency.(2)An attribute based searchable encryption scheme supporting multi keyword search is proposed.According to the requirement of cloud users for the flexibility of search strategy,based on LSSS access structure,an attribute based searchable encryption scheme is proposed to support multi keyword search.In the scheme,the connection subset keyword search technology is used to support multi keyword search,and there is no need to fix the keyword domain in the search process,which improves the flexibility of the search strategy;an index generation mechanism that needs the private key of the data owner to participate in is designed,which can resist the guessing attack of internal and external keywords at the same time;the online / offline idea is used to improve the efficiency of the scheme.Under the standard model theoretical analysis shows that the scheme has trapdoor security and IND-CKA security.Simulation results and performance analysis show that this scheme has certain efficiency advantages compared with similar schemes.