对称可搜索加密的安全性研究进展

To save local storage space and management overhead, now files can be uploaded to cloud servers. As an important cloud technology, cloud storage service has been widely researched and applied. The storage of files in plaintext obviously cannot meet the privacy and security requirements. However, if the encrypted files are uploaded to the server by traditional encryption, the server will lose the ability to search them by keywords. Searchable encryption (SE) is a cryptographic primitive developed in recent years that supports clients to perform keyword search on ciphertext. By searchable encryption, clients can encrypt the files and uploads them to the cloud server and then retrieve them by keywords, which is convenient for clients and protects the privacy of the files. This paper introduces the basic concepts of SE. Starting from the construction method of symmetric searchable encryption, we summarize the research results about security of existing symmetric searchable encryption. We focus on the development process of the adaptive security model of symmetric searchable encryption, and analyze inference attacks, file-injection attacks, new security models and countermeasures. Then we point out the main problems currently facing the security research of SE and the future direction.