Database watermarking system based on random response mechanism local differential privacy

Abstract

The invention discloses a database watermarking system based on random response mechanism local differential privacy. A data owner uses a database preprocessing module to perform attribute sorting ona to-be-published original database to obtain a sorting database; a local differential privacy and watermark embedding module implements local differential privacy based on a random response mechanismfor the sensitive attribute values of the sorting database to obtain a privacy protection database, embeds watermark information into the privacy protection database according to data features in theprivacy protection database to obtain a database with watermark information, and publishes the database with the watermark information to the cloud; for a suspected database, a data owner or an authoritative evidence obtaining mechanism extracts watermark information from the suspected database according to a secret key and a watermark position array corresponding to a database with watermark information, so that copyright tracking and database integrity verification are carried out. According to the method, the privacy data security, data integrity, source reliability and the like of the database can be comprehensively protected.

Description

technical field [0001] The invention belongs to the field of database security, in particular to a database watermarking system based on a random response mechanism local differential privacy and an implementation method thereof. Background technique [0002] The rapid development of computer network technology and big data technology has opened up a convenient way for the rapid dissemination of data around the world. However, the increasingly popular sharing and trading of big data has also led to increasingly serious problems of information security and database copyright protection. In recent years, data leakage incidents have occurred frequently, even in the medical field and service industry that contain a large amount of sensitive data. As an important carrier for the government, enterprises, and individuals to obtain and transmit information, database creation, transmission, and sharing have increased significantly, but it also brings security risks, such as data thef...

AI Technical Summary

Problems solved by technology

The current database watermarking technology can only verify the integrity of the database and protect the copyright of the database, but cannot protect privacy

[0005] 2. At present, there is no database watermarking method that can not only provide database privacy protection, but also provide original data copyright tracking and integrity verification

[0006] 3. The data distortion caused by the current differential privacy technology for privacy protection is relatively large

[0007] 4. The robustness of the current database watermarking technology needs to be further improved, and the embedding of the watermark will cause distortion and reduce the data quality, which cannot meet the needs of data mining and statistical analysis in the big data sharing environment, and needs to be further improved

[0008] In view of the above shortcomings, the inventor of the present application has disclosed "a database watermarking method based on local differential privacy" in the invention patent application with the publication number of CN109033766A and the publication date of 20181218, which is based on the local differential privacy of the Laplacian mechanism. The invention patent application of the database watermarking method is to provide an improved solution, but its technical solution still has shortcomings. First, although this method provides better database privacy protection while providing copyright protection, it still does not solve the problem caused by the traditional differential privacy mechanism. The problem of large distortion; the second is that the database watermarking technology in this method has good robustness, but there is still room for further improvement

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