Cloud storage-oriented multi-keyword ciphertext retrieval method and system

Abstract

The invention relates to a cloud storage-oriented multi-keyword ciphertext retrieval method and system, and relates to the field of information safety. The system comprises a client, an encryption andciphertext retrieval cloud server and a cloud storage server, wherein the client is connected with the encryption and ciphertext retrieval cloud server and the cloud storage server, and is used for uploading ciphertext data to the cloud storage server, downloading the ciphertext data from the cloud storage server or updating the ciphertext data; the encryption and ciphertext retrieval cloud server is used for complexly storing data encryption secret keys and ciphertext indexes and executing ciphertext retrieval requests of the client; and the cloud storage server is formed by a plurality of server clusters. According to the method and system, a secret key management scheme with higher safety degree is provided so that multi-keyword ciphertext retrieval is supported.

Description

technical field [0001] The invention relates to the field of information security, in particular to a cloud storage-oriented multi-keyword ciphertext retrieval method and system. Background technique [0002] These cloud computing solutions solve the user's demand for backing up files to a certain extent, but there are significant flaws in terms of security. Due to the characteristics of the cloud model, data owners no longer maintain the carrier for storing data, and users must fully trust it no matter which cloud service provider they choose. But in reality, user data, especially data collected using smart terminals (for example: personal photos, communication records, etc.) is often related to privacy, and users do not want to entrust it completely to storage service providers. The lack of effective data security protection measures has become one of the most important reasons hindering the promotion of cloud services. [0003] The effective way to solve this problem is...

AI Technical Summary

Problems solved by technology

[0008] 1) The user's key management is complex

The existing technical solutions require the user to provide a data encryption and decryption key when encrypting, and a key with sufficient strength is difficult for the user to memorize

[0009] 2) Low efficiency of ciphertext query

Once the data is encrypted, the original sequence relationship of the data will be destroyed, making the original index mechanism no longer available. When the user searches, he has to retrieve all the ciphertexts, and after decryption, he will judge whether it is the data he needs, which will return a large number of ciphertexts. Useless information, low execution efficiency

[0010] 3) Multi-keyword retrieval is not possible

[0011] In summary, a clear and ciphertext retrieval method that can effectively improve the user's data security protection and privacy protection capabilities, improve the efficiency of ciphertext storage, promote the development of cloud computing, and increase the efficiency of information system use needs to be proposed.

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