A searchable encryption method based on Chinese in cloud environment

Abstract

The invention discloses a searchable encryption method based on Chinese in a cloud environment. A dynamic searchable encryption scheme is finished based on the features of a PEKS scheme and a Bloom filter; a ciphertext search function is finished in an insecure channel; fuzzy keyword search based on a public key searchable encryption scheme is supported; multi-keyword search of the Chinese is supported; the keywords in a document are dynamically added or deleted; according to the method provided by the invention, an inner product operation is carried out through constructing a search vector and a file vector so as to finish a fuzzy search matching function; the similarity weight of the keywords in the document and the keywords of a search trap door is calculated through importing the vectors; the ciphertext search function and the fuzzy keyword search function are realized; the ciphertext keywords can be securely transmitted on a public channel in adoption of a server and user double-key pair mode; in application of a hash function and a pseudo-random function, through the scheme, the keyword selection attack can be resisted effectively; and the ciphertext is searched under a condition that the cloud server is semi-trusted.

Description

technical field

[0001] The invention belongs to the technical field of information security, and in particular relates to a Chinese-based searchable encryption method in a cloud environment. Background technique

[0002] At present, with the increasing popularity of people storing data in the cloud, while people store more and more data in the cloud, the security and reliability of their data has received unprecedented attention. Although the use of encryption technology to encrypt files and store them in the cloud can effectively ensure the confidentiality of data, but in this way, the user's data loses a lot of operability. For example, searching for files only requires matching keywords directly, but this cannot be done for encrypted data. Therefore, in order to provide a ciphertext search method, a large number of searchable encryption methods have been conceived, but the searchable encryption methods currently proposed are mainly based on English words, and most of the...

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