Encrypted file searching method and device and computer readable medium

Abstract

The invention relates to an encrypted file searching method and device and a computer readable medium, and the method comprises the steps of selecting a first random number from a target set, and generating a public key through the first random number; generating permission verification parameters by using the public key and the public key of the authorized user side; encrypting the keyword of the encrypted file by using the public key and the public key of the authorized user side to obtain a keyword ciphertext; and enabling the cloud server to verify the deformed identity parameter sent by the authorized user side by using the authority verification parameter, and to perform keyword matching on the search trap door sent by the authorized user side by using the keyword ciphertext after the verification is passed. According to the scheme, the risk that other unauthorized user sides counterfeit the identity parameters of the authorized user side to search the encrypted file can be reduced, so that the risk of data leakage is reduced.

Description

technical field [0001] The present invention relates to the technical field of servers, in particular to an encrypted file search method, device and computer-readable medium. Background technique [0002] In the information age, more and more resources are gathered on the Internet. In order to efficiently manage and utilize Internet resources, the data owner can outsource the data and upload it to the cloud server. However, outsourcing data will bring about data security issues. Therefore, the data owner can encrypt the file and then upload it to the cloud server. But this brings up the question of how to perform keyword searches on the ciphertext. In order to solve this problem, a searchable encryption (SE) technology is proposed. In the searchable encryption scheme, it includes: data owner, user and cloud server. Among them, the data owner is used to upload encrypted files to the cloud server; the cloud server is used to store encrypted files; the client is used to sear...

AI Technical Summary

Problems solved by technology

However, the client that makes the search request may not have the search permission, and the search request may be initiated by a malicious attacker who obtained the search token, thus causing data leakage.

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