Ciphertext search authentication method oriented towards cloud storage

Abstract

The invention provides a ciphertext search authentication method oriented towards cloud storage and relates to the field of computer information safety. The ciphertext search authentication method oriented towards the cloud storage includes the following steps that files to be uploaded are selected, keywords are designated, a reverse index is constructed to generate an encryption index and a search authentication symbol, and the encryption index and the search authentication symbol are sent to a cloud server to be stored; a corresponding search token is generated by a user according to the certain keyword, and the cloud server performs search operation and sends a search result back; challenge information is generated by the user according to the search result, authentication is generated by the cloud server, and an authentication value is verified by the user to finish search result verification; the user selects the files to be added or deleted, an update token is generated, the cloud server updates the encryption index and the search authentication symbol, and update information is sent back. According to the ciphertext search authentication method oriented towards the cloud storage, data information of the user will not be revealed to the cloud server and an attacker, the user can use the keywords to search for ciphertexts stored in the cloud server, authenticates the correctness of the search result, supports dynamic update of the user files and ensures confidentiality of user data and correctness of the search result.

Description

technical field [0001] The invention relates to the field of computer information security, in particular to a cloud storage-oriented ciphertext search authentication method. Background technique [0002] In recent years, with the rapid development of cloud computing, cloud storage, as an important part of it, has gradually become a research hotspot. More and more enterprises and individuals use cloud storage services to store data on cloud servers. However, due to the difficulty in evaluating the reliability of cloud service providers and the lack of security control over data in cloud storage, user data may be lost and leaked. [0003] In the cloud storage environment, in order to protect their private data, users usually choose to encrypt the data and then store it in the cloud, so that the cloud storage server cannot know any information about the plaintext. Although this can ensure the confidentiality of the data, it brings difficulties in retrieval. For example, a us...

AI Technical Summary

Problems solved by technology

[0004] Due to factors such as difficulty in evaluating the reliability of cloud service providers and insufficient control of data security by cloud storage, user data may be maliciously tampered with, resulting in errors in user data retrieval results. Therefore, a method for authenticating search results is designed. extremely necessary

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