Database encryption method and encryption database query method

Abstract

The invention relates to a database encryption method. The equivalent encryption algorithm, the preserving encryption algorithm and the homomorphic encryption are specifically designed and introduced to classify and encrypt data in a database, the data is saved in a server database, the hidden hazard that untrusted servers search for and leak confidential data is eliminated, and data privacy is protected. The invention further relates to an encryption database query method based on the database encryption method. On the basis that the equivalent encryption algorithm, the preserving encryption algorithm and the homomorphic encryption are specifically designed and introduced to classify and encrypt data in the database, a processing method for directly executing query operation on ciphertext is provided, execution efficiency is improved, and communication and calculation cost is reduced for users.

Description

technical field [0001] The invention relates to a database encryption method and the encrypted database query method, belonging to the technical field of data privacy protection. Background technique [0002] Privacy protection is an important part of database security. Its security threats come from two aspects. One is outside the database system. Attackers exploit system vulnerabilities or illegally obtain access rights to steal private data; the other is inside the database system. Database administrators with legal access rights have the possibility of probing and leaking private data. [0003] For this, the solution in the prior art is to encrypt the private data and store it in the database, and decrypt the ciphertext data when inquiring. The disadvantage of this method is that after the plaintext data is encrypted, some attributes of the plaintext are lost, such as the order relationship between the data, and the original operations on the plaintext cannot be perform...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that after the plaintext data is encrypted, some attributes of the plaintext are lost, such as the order relationship between the data, and the original operations on the plaintext cannot be performed on the ciphertext, and all ciphertexts need to be decrypted into plaintext In order to complete the operation, this solution is much lower in execution efficiency than plaintext databases when faced with large-scale database storage requirements

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