Biometric-Based Searchable Encryption Scheme

The big data plays in cloud computing and cloud storage technology a great value,but it also faces many security problems of information leakage.Although encrypted storage can ensure data security,uploading and downloading data is inconvenient.To solve this problem,searchable encryption technology came into being,to implement keyword retrieval on encrypted data and only to obtain target data of interest.In general,the current research direction of searchable encryption technology is mainly security and usability,and it is still an area of research value in the future.After researching and summarizing the scientific research results contributed by scholars,we try to do further work,the main contributions of this thesis are as follows:(1)Our thesis introduces the research background and the significance,the difficulties and the challenges,the system model,the security definition and other related knowledge of searchable encryption technology.(2)Aiming at the security problem that the entities involved in the searchable encryption technology may have fraudulent behavior,our thesis gives the definition of fairness security,and proposes a searchable encryption scheme based on blockchain.We combine the third-party trusted authority TA and the blockchain to verify and record the results.The security analysis shows that our scheme is feasible and can achieve fairness security.(3)Aiming at the problem that the integrity of search results can not be verified in searchable encryption technology,and the problem of revealing privacy by old keyword trapdoors in dynamic update,our thesis proposes the biometric-based searchable encryption scheme.The scheme utilizes the uniqueness of biometrics to effectively solve the above problems.The security analysis shows that our scheme is feasible and secure.The performance analysis and experimental simulation results show that our scheme supports dynamic update,search results verifiable and other functions,and the retrieval efficiency is high.(4)In the biometric-based searchable encryption scheme,in order to improve the retrieval efficiency of keywords,our thesis also improves the selection criteria of keywords and the construction of indexes.For example,setting stop words and constructing multiple sub-indexes to help retrieve the main index.