30 results about "Database privacy" patented technology

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.

The invention relates to a system and a method for privacy preservation of sensitive attributes stored in a database. The invention reduces the complexity and enhances privacy preservation of the database by determining the distribution of sensitive data based on Kurtosis measurement. The invention further determines and compares the optimal value of k-sensitive attributes in k-anonymity data sanitization model with the optimal value of l sensitive attributes in l diversity data sanitization model using adversary information gain. The invention reduces the complexity of the method for preserving privacy by applying k anonymity only, when the distribution of the sensitive data is leptokurtic and optimal value of k is greater than the optimal value of l.

A hardware database privacy device is communicatively coupled to a private database system. The hardware database privacy device receives a request from a client device to perform a query of the private database system and identifies a level of differential privacy corresponding to the request. The identified level of differential privacy includes privacy parameters (ε,δ) indicating the degree of information released about the private database system. The hardware database privacy device identifies a set of operations to be performed on the set of data that corresponds to the requested query. After the set of data is accessed, the set of operations is modified based on the identified level of differential privacy such that a performance of the modified set of operations produces a result set that is (ε,δ)-differentially private.

The invention discloses a database watermark method based on local differential privacy. The method comprises: sorting the attributes according to the attribute name of the database, and grouping thetuples according to the primary key of the tuples in the database for embedding the watermark; performing differential privacy of sensitive attributes in database; the watermark being embedded according to the characteristics of the data in the database after differential privacy, and then the watermarked database being published to the cloud; users downloading published databases from the cloud,watermarks being extracted from published databases for copyright tracking and data integrity verification. The database watermarking method based on the local differential privacy not only maintainsthe nature of the differential privacy but also reduces the data distortion caused by the differential privacy, and has high robustness against various attacks such as the addition, modification, deletion and the like of the database. The invention is used for providing a comprehensive protection mechanism for the security of database privacy, tamper integrity, source reliability and the like.

The invention discloses a one-way transmission quantum database privacy query method, comprising the steps that a query user randomly generates a mixed sequence of a single photon and a Bell state; the database selects half of particles for eavesdropping detection; the database selects a Z base or a Bell base for measurement; the database announces two binary bits according to a measurement result; the query user obtains a key bit at a certain probability; and the database and the query user obtain a final key by using a post-processing method. According to the one-way transmission quantum database privacy query method, the query user only needs to send the quantum information to the database owner once, so that the privacy query of the user on the database can be realized, and the realization method is simpler; and on the basis of ensuring completion of privacy query, the quantum bit use efficiency is improved, and no matter whether an internal eavesdropper or an external eavesdroppercannot obtain additional key information.

The invention provides a private and private data protection mechanism in an alliance chain. The private and private data protection mechanism comprises a node and a sorting service, the node is in communication connection with the sorting service through a channel; an account book file, a private database, a private database and a general database are stored in the node, and the private database,the private database and the general database are connected with the account book file through peer nodes; and private data, private data and general data are stored in the account book file. The method has the beneficial effects that the security protection of private and private data in the alliance chain can be effectively realized, and the private and private data is prevented from being disclosed to all members in the alliance chain.

The invention discloses a bidirectional communication quantum database privacy query method based on a Bell state. The method comprises the steps that a database randomly sends particle pairs in fourBell states to a query user, the query user randomly executes measurement or reflection operation on the received particle pair; wherein the database selects Z-based or Bell-based measurement, the database announces two binary bits according to a measurement result, the query user deduces to obtain a key bit, the database randomly selects a half key for eavesdropping detection, and the database and the query user obtain a final key according to the remaining keys by using a post-processing method. According to the invention, based on the Bell state, through bidirectional communication betweenthe database and the user, the quantum bit use efficiency is improved, the query key generation process is simplified, the privacy query of the user for the database is realized, and internal and external eavesdroppers cannot obtain the key.

The invention relates to the field of quantum communication and quantum cryptography, in particular to a multi-user quantum privacy query method with authentication, which comprises the following steps that: participants negotiate important security parameters; the database provider prepares an initial multi-particle GHZ state and distributes corresponding particles to other participants; all participants perform security detection to verify whether the quantum state is shared securely; a database owner and a user utilize an entanglement swapping technology to convert bidirectional identity authentication between a database and each user into verification of legality of identities of other participants by a trusted third party; if the identity authentication of the participant succeeds, the database provider carries out casual key negotiation with the user; and the database provider and the user carry out key post-processing and complete privacy query. According to the method, an identity authentication mechanism is added, the security of multi-user quantum privacy query is enhanced, database privacy and user privacy of the same level are achieved, and external counterfeit attacks and man-in-the-middle attacks can be defended.

The invention belongs to the technical field of database privacy protection, and discloses a method for processing big data based on an MLDM algorithm meeting secondary aggregation. The method comprises the steps of introducing a k-means algorithm based on a (1,d,e)-MDAV algorithm; and when a big data set is processed, dividing the big data set into a plurality of small data sets firstly, then processing each small data set by using the (1,d,e)-MDAV algorithm, and finally combining the processed data, thereby enabling the whole data set to meet a (1,d,e)-diversity rule, and obtaining relatively low algorithm time complexity and relatively short algorithm time through improvement. According to the method, a k-means algorithm is introduced based on the (1,d,e)-MDAV algorithm; a new MLDM algorithm is proposed; and when the big data set is processed, the big data set is divided into the small data sets firstly, then each small data set is processed by using the (1,d,e)-MDAV algorithm, and finally the processed data are combined, so that the whole data set can meet the (1,d,e)-diversity rule, and the relatively low algorithm time complexity and the relatively short algorithm time can be obtained through the improvement.

According to a multi-user quantum private query method provided by the invention, the product state of the single photon state is used as an initial quantum resource, so that n users can query the data of the database at the same time. In the method of the invention, database privacy and user privacy should be compromised by selecting an appropriate value for theta. Due to the loyalty detection process of the database owner, a smaller theta can be preferentially selected to ensure better database privacy. Furthermore, the method of the present invention is loss tolerant, feasible in the case of large databases, robust to quantum storage attacks, and flexible.

The invention provides a database security management method and device, electronic equipment and a readable storage medium, and relates to the technical field of data security. The method comprises the steps of receiving access traffic for performing access operation on a database; analyzing the access flow, and obtaining a database operation statement and access user information in the access flow; performing SQL lexical analysis and SQL grammatical analysis on the database operation statement to obtain database parameter information involved in the database operation statement; performing sensitive information matching on the database parameter information and the access user information to obtain a matching result; and judging whether the access operation is a sensitive operation or not according to a matching result. According to the scheme, the parameter information in the statement can be analyzed more quickly and accurately through SQL lexical analysis and SQL grammatical analysis, so that the matching of the sensitive information is more accurate, the operation of a user can be accurately recognized to prevent some violation operations, and the leakage of private data of adatabase is avoided.

The invention discloses a method, a system and equipment for improving privacy query online efficiency and a storage medium, specifically, privacy query is decomposed into an offline part and an online part, the offline part refers to that user query performs related data preparation and calculation work offline, and the online part refers to that data is requested from a database in real time. In the offline stage, the client obtains the'intermediate value 'of total data through an algorithm, in the online stage, the client obtains the position of the data needing to be inquired in the database through the'intermediate value', the client initiates a request to the database to obtain the data, and data items needing to be inquired are obtained by combining the previous intermediate value. The privacy of data query can be protected, and meanwhile, the efficiency of data query is improved. The database privacy query efficiency bottleneck is solved, and the financial service privacy protection requirement can be well supported. Particularly, when a bank performs joint modeling and portraying on customers and enterprises, privacy and performance can be ensured.