Research On Searchable Encryption Scheme Based On Attribute-Based Encryption

In recent years,with the rapid development of the Internet,tens of thousands of data are generated from various applications every day.Meanwhile,the continuous maturity of technologies such as the Internet of Things,Industry 4.0 and machine intelligence has made the value of data more prominent.The cloud storage services with the advantages of large storage capacity,large computing space,easy access,and low price have become an important choice for many companies and individuals.However,the popular cloud storage also has some data security and user privacy issues,which are particularly dangerous in the current era where machine learning,big data analysis and other related technologies are deeply researched and applied."Searchable encryption" can simultaneously ensure the security of data and realize the seach service under ciphertext data,which is an important technology to solve the problem of data security in cloud storage.In addition,applications that utilize cloud storage often need to provide fine-grained access control for users to achieve targeted data sharing.However,the existing searchable encryption algorithms with fine-grained access control still have some shortcomings.In this paper,after analyzing the existing algorithms,a fine-grained authorized secure searchable encryption protocol based on attribute-based encryption is proposed,which can guarantee data security,keyword search under ciphertext data,and fine-grained access control.The main work of this paper includes the following:(1)For the problem of the existing attribute-based searchable encryption schemes,such as some of them cannot support the AND gate,OR gate and threshold gate at the same time durirng user attribute judgment,some of them cannot be applied to practical applications due to the large calculation overhead,this paper proposes a searchable encryption scheme based on attribute-based encryption with single authorization center,considering the scenario of a single a uthorization center.(2)For the security problem caused by the user's exposure of all his attribute information to a single authorization center during the process of obtaining permissions,and the problem that the user's permissions cannot be uniformly authorized by a single authorization center when the user's attributes are assigned by different authorities in the actual application scenario,this paper proposes a searchable encryption scheme based on attribute-based encryption with multi-authorization center.This paper also shows that the two schemes proposed in this paper can ensure that the query results are correct,that the plaintext information of data files and index will not be leaked to “curious but honest” servers or malicious attackers with polynomial time,and that the appropriate cost makes the protocol can be applicable to practical application.In addition,the paper analyzes the time cost of the scheme through experiments and find that the time cost of index construction and keyword query is linearly related to the number of keywords,but has no obvious relationship with the number of documents,so this scheme can be well applied when the number of keywords is small but the number of documents is large.