6 results about "K-anonymity" patented technology

The invention discloses a self-adaptive personal information desensitization method and system based on availability evaluation. The method comprises the following steps: receiving a to-be-desensitized original data set and identifying a privacy field; a corresponding desensitization strategy is formulated for the privacy fields, at least two fields are appointed to use a generalization algorithm, and for the privacy fields appointed with the generalization algorithm, one field enabling the availability of a corresponding field set to be the highest is circularly selected for generalization until K anonymity is met; for other privacy fields, performing desensitization processing on the corresponding privacy fields according to the formulated desensitization strategy; and combining the desensitization results to obtain a desensitized data set. According to the scheme, the process of using the availability index to guide K anonymity is provided, so that the desensitization process pays attention to the availability and privacy at the same time, the availability of the data set can be ensured to the maximum extent under the condition that the privacy meets the requirement, the finally output desensitized data set has higher availability, and the desensitization efficiency is improved. And a certain degree of guarantee is provided for the subsequent data analysis effect.

The present invention proposes a pedestrian identity privacy protection method combined with k-anonymity. The present invention generates higher quality anonymous images through a cross-identity training strategy; finally, through the designed k-anonymity privacy protection method, the privacy of pedestrian image data is retained while also retaining the availability of data; specific steps: Step 1: Proxy data set acquisition and image preprocessing; Step 2: Establishing a k-anonymity mechanism; Step 3: Constructing an anonymous pedestrian generation adversarial network; Step 4: Anonymous pedestrian generation objective function; Step 5: Using a public data set for training and testing, and outputting the final result. The present invention retains both the identity privacy and the attributes of pedestrians. In terms of anonymous pedestrian generation, on the one hand, the method combines the fusion of attributes and target background into the pedestrian generation process, and on the other hand, the method proposes a cross-identity training strategy to improve the quality of the generated image.

The present invention discloses a method and device for generating a fake location based on improved K-Medoids clustering, the method comprising seven steps: preprocessing historical query data to generate time series data; dividing time using an improved K-Medoids clustering algorithm; calculating query probability; selecting fake locations with similar query probabilities in corresponding time periods to construct an anonymous set, and initiating location service queries; and the service provider returning query results. The present invention mines out the regularity of location service requests in different time periods from historical information, realizes the reasonable division of time periods, realizes k-anonymity by dynamically selecting fake locations with similar query probabilities in corresponding time periods, effectively resists malicious attackers who have the ability to mine historical data, and improves the security of user location privacy.

The present invention provides a data protection method and device for a medical health record management system. The method includes: collecting user medical data; performing standardization processing on the user medical data to obtain a numerical user data set; encrypting the data of the numerical user data set by using the HiLL reversible matrix encryption algorithm, and storing the encrypted data in a database; performing restoration processing on the data stored in the database, and converting the restored data into desensitized data by using an improved algorithm based on K-anonymous clustering, so as to publish it to a front-end display interface for visual display. The present invention adopts two different data encryption schemes according to the characteristics of different stages of the data life cycle: the privacy protection of front-end data adopts an improved algorithm based on k anonymity; the encryption of background data adopts reversible matrix encryption, thereby realizing efficient privacy protection for medical data starting from the data life cycle.

The invention relates to the technical field of data security, in particular to a scientific and technological achievement transformation platform-oriented privacy data desensitization method, which comprises the following steps of: acquiring scientific and technological achievement data from a scientific and technological achievement transformation platform, and performing word segmentation and keyword extraction on text contents in the scientific and technological achievement data; performing semantic clustering on the keywords based on the feature vectors of the keywords to construct a generalization hierarchical tree; carrying out weighted fusion on the sensitivity and the rare degree of the keyword to obtain data privacy; and performing equal-length interval division according to the index size of the data privacy, and allocating a self-adaptive K value for generalization by adopting a K anonymity algorithm for each divided group so as to perform generalization desensitization processing on keywords in the scientific and technological achievement data. According to the method, the validity of data loss caused by excessive generalization of the data can be avoided on the premise of ensuring the privacy of high-risk sensitive data in the scientific and technological achievement data.

The application relates to the field of artificial intelligence and big data processing technology, and discloses a user portrait construction method based on AI big data, which comprises the following steps: performing differential privacy injection preprocessing on original user behavior logs; constructing a dynamic generalization unit satisfying k anonymity and having minimum generalization error; mapping the unit to a low-dimensional embedding space to generate an anonymous sequence; performing high-fidelity sequence reconstruction by using a conditional generative adversarial network; separating long-term interest and short-term intention by multi-granularity time sequence decomposition, respectively aggregating features by using a double-channel attention mechanism, and finally fusing to generate a high-fidelity user portrait vector. The system comprises corresponding function modules. The application significantly improves the behavior fidelity of the user portrait and the recommendation recall rate under the premise of meeting the differential privacy and k anonymity legal standards.