30 results about "Database privacy" patented technology

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 (∈,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 (∈,δ)-differentially private.

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 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.

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 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.

The invention discloses a one-way transmission quantum database privacy query method. The method includes querying a user to randomly generate a mixed sequence of single photons and Bell states, and the database selects half of the particles for wiretapping detection, and the database selects Z Base or Bell base is measured, the database announces two binary bits according to the measurement results, and the query user obtains the key bit with a certain probability, and the database and the query user use the post-processing method to obtain the final key. The invention only needs to query the user to send quantum information to the database owner once to realize the user's privacy query to the database, and the implementation method is simpler; on the basis of ensuring the completion of the privacy query, the use efficiency of qubits is improved, and no matter whether it is internal Neither an external eavesdropper can obtain additional key information.

The present invention is applicable to the technical field of data processing, and provides a method, device, and terminal equipment for protecting the privacy and security of a natural person database. The method is applied to a system including a data center, an access party, and a terminal equipment, including: The terminal device negotiates to generate a temporary session key to securely obtain real-time data generated by natural persons when using the terminal device. The real-time data is encrypted by the terminal device using the session key and uploaded to the data center via the access party. ; When it is necessary to use the real-time data of the data center, control the access to the real-time data based on the zero-trust security system, and at least use the data desensitization algorithm and / or homomorphic encryption algorithm to protect the natural persons in the real-time data Private information is encrypted. The invention can effectively guarantee that the private information about natural persons in the data will not be leaked in any link of using the data.

The invention proposes a semi-quantum private query method that does not stimulate the classical user's measurement ability, utilizes the laws of quantum mechanics, and realizes that a user can secretly query a piece of data from a database on the premise that user privacy and database privacy are guaranteed. The method of the present invention has the following characteristics: (1) it adopts only one quantum state as the initial quantum state; (2) it does not require classical users to perform measurement operations; (3) it is deception-sensitive, meaning that if database privacy or User privacy is violated, and attacks can be detected.

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.

The invention discloses a two-way communication quantum database privacy query method based on the Bell state. The method includes that the database randomly sends particle pairs in four Bell states to the query user, and the query user randomly performs measurement or reflection on the received particle pairs. operation, database selection Z Base or Bell base measurement, the database announces two binary bits according to the measurement results, the query user infers the key bits, the database randomly selects half of the keys for wiretapping detection, and the database and query users use the post-processing method to obtain the final key based on the remaining keys . The invention improves the efficiency of qubit usage through the two-way communication between the database and the user based on the Bell state, simplifies the generation process of the query key, realizes the user's private query of the database, and prevents internal and external eavesdroppers from obtaining the key.