Ciphertext database privacy protection enquiring method

Abstract

The invention relates to realization of query of encrypted database tables by utilization of a structuralized additional data structure on the premise that an internal operating mechanism of a database management system is not changed, which comprises an encrypt data containing an index query structure generation method and a whole encrypt query process. A database server judges the retrievable information range of cryptographic keys of certain levels held by users first, and quickly performs information retrieval within the information range, so as to protect the privacy of information in the database.

Description

technical field [0001] The invention relates to database and information security technology, in particular to a query method for a ciphertext database. Background technique [0002] With the continuous development of information technology, the application of database system is becoming more and more popular. The use of database system to realize data sharing can make people's daily life and work more convenient and faster, but at the same time, it also provides more opportunities for illegal access to database data information. With more opportunities, the problem of sensitive data protection in database systems is becoming more and more serious. [0003] Among many protection methods for sensitive data, encrypting the data information in the database is a very effective solution. But on the other hand, after the data in the database is encrypted, the original same keywords may become different ciphertext information, and the sequence relationship between keywords is also...

AI Technical Summary

Problems solved by technology

[0009] 1. The calculation speed is slow: when creating the ciphertext data table, the block encryption algorithm is used twice for each attribute value of each record, and the calculation complexity is relatively large, which results in the generation of the ciphertext data table. Restricted; and when querying, if there are many query results that may be obtained, due to the same reason, there will be a problem of long processing time when querying, so the efficiency of the solution needs to be improved

[0010] 2. The query method is single: when the ciphertext data table is established, the order relationship is not stored in the index value in a certain way, so that the generated ciphertext data table does not maintain the order relationship between the same attribute and different attribute values

Therefore, the scheme designed in reference 1 has relatively large limitations in actual use.

[0011] 3. Limited security: In the scheme designed in reference 1, the encryption algorithm of the index value and the key value used in the verification equation all use the block encryption algorithm

This affects the security to a certain extent

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