8 results about "Random mapping" patented technology

The invention discloses a body fat prediction system and method based on a multi-band impedance signal, and relates to the technical field of big data analys.The method comprises the steps that impedance data of different segments under different frequency bands, the body fat amount, the lean body weight and the human body weight are collected; integrity verification is carried out on the impedance data, missing values are filled with mean values, abnormal values are removed and corrected, and meanwhile timestamp alignment is carried out; extracting features to construct an original impedance vector, and mapping the original impedance vector to a high-dimensional space through a random matrix to generate a random mapping function; constructing a time sequence regression model, taking the embedding dimension as an input layer, taking the body fat amount and the lean body mass as an output layer, and using mean square error calibration and back propagation updating; and through a mean square error weighting evaluation model, outputting a performance standard result. The system comprises a data acquisition module, a data preprocessing module, a random distribution embedding module, a time sequence model training module and a display module. The method can adapt to impedance characteristics of different crowds, is suitable for portable terminal or smart home body measurement, and can be used at high frequency in daily life.

A semantically secure identification and communication method based on classical quantum channels comprises the following steps: constructing a classical quantum channel, selecting the input signal distribution and dividing the codeword, constructing an encoder, joint decoding, verification and identification, reliability analysis, and information leakage analysis. This invention divides the communication codeword into a main block and an auxiliary block. The main block uses an output statistical approximation of the transmission codebook, making it impossible for eavesdroppers to distinguish the communication signal from background noise. The auxiliary block uses a hash function for random mapping, preventing eavesdroppers from extracting valid information, thus achieving semantic security. Mapping the identification message to a combination of seed and hash value reduces the probability of confusion between different identification messages, improves identification accuracy, and provides a coding basis for analyzing false alarms, missed alarms, and information leakage. This invention has advantages such as strong confidentiality, strong concealment, high identification accuracy, and the ability to achieve identification communication while satisfying semantically secure requirements. It can be used for classical quantum secure communication.

According to various embodiments, a method executed by a processor is described, comprising: providing an electronic file that has a representable content of the electronic file in a first content description layer, wherein the representable content of the electronic file is described at a respective position within the first content description layer by means of an index, and generating a digital copy of the electronic file having several content description layers by performing the following for each index of at least a part of the representable content of the first content description layer of the electronic file: • For each index, a corresponding additional index is generated, wherein the additional index is set up in such a way that it is not visible to a human viewer when displaying the content of the electronic file using a file display program, wherein the additional index is generated using a random image; • The index is stored in one of the multiple content description layers, • The additional index is stored in a different content description layer among the multiple content description layers.

The invention provides an order-preserving encryption method, a data query method and a data storage method. The order-preserving encryption method comprises the following steps: acquiring plaintext data, and performing order-preserving random mapping on the plaintext data to obtain first order-preserving coded data; carrying out decryptable encryption processing on the plaintext data to obtain decryptable ciphertext data; and splicing the first order-preserving coded data and the decryptable ciphertext data to obtain order-preserving ciphertext data. And according to the size sequence relationship of the first order-preserving codes, operations such as sequence-related comparison sorting query and the like in the secret state database can be quickly completed, and a plaintext form result corresponding to query is obtained. Compared with a common order-preserving encryption algorithm, the order-preserving coding encryption method and device can realize an efficient and safe order-preserving coding encryption function with a controllable ciphertext length.

The invention relates to a 3D point cloud target detection method and system based on random mapping, and the method comprises the steps: compressing a point cloud implicit vector of a 3D point cloud target detection image into a low-dimensional vector through a lower projection matrix, carrying out the L2 norm normalization processing, and obtaining a normalized vector; projecting the normalized vector to k one-dimensional axes through k independent random linear mapping functions to generate k projection value sequences, screening out the projection value sequence with the maximum variance as an optimal sequence, and calculating a vector difference value between the normalized query vector and the normalized key vector based on the optimal sequence so as to realize approximate nearest neighbor search. And the trained Transform target detection model carries out target detection on the 3D point cloud target detection image according to the sparse attention operator to obtain a target detection result. Therefore, the detection efficiency and the detection accuracy are improved.

The application discloses a data sharing method and device, equipment, a storage medium and a program product. The method comprises the following steps: performing first random mapping on a plurality of first original data to obtain a position index in a first sequence corresponding to each first original data; performing second random mapping on each first original data to obtain a second sequence corresponding to each first original data; performing third mapping on each second sequence according to the position index to obtain an encoding matrix, performing pseudo-random operation on the plurality of first original data based on the encoding matrix to obtain a first operation result; receiving a second operation result corresponding to a plurality of second original data sent by a second object, determining to-be-shared data according to the first operation result and the second operation result, and sending the to-be-shared data to the first object and / or the second object. By using the method, the leakage of data other than the to-be-shared data in local data can be avoided, and the privacy and security of data sharing are ensured.

The invention provides a width learning gradient stabilization method based on a generative adversarial network, and the method comprises the steps: obtaining and cleaning data information from a database through a data collection and preparation module, so as to obtain the needed information; the feature construction and width expansion module introduces a width learning structure, and constructs a wide feature space with strong nonlinear representation capability through multiple groups of random mapping nodes and enhanced nodes; the model construction and training module adopts a width network structure and realizes final output through a trainable linear projection weight; according to the recommendation result generation and output module, the system performs prediction scoring on candidate items according to the output of the trained generator; and the model evaluation and updating module is used for evaluating a model effect through an offline evaluation index and continuously monitoring recommendation performance in an online stage.

A method and system for hiding a secret into a digital information and for recovering it are proposed. The method comprises, by a hiding module: obtaining a digital information and a secret that a user wants to hide into the digital information; generating an invariant information using the digital information; generating a hiding information by implementing a random data processing comprising randomly mapping bits of the secret with bits of the invariant information; generating a secret identifier unique for the secret using the invariant information and / or a value provided by the user; generating a custodian hiding information using the generated secret identifier and an encrypted hiding information; sending the custodian hiding information and an identity proof of the user to a custodian module; and receiving a notification of whether the custodian hiding information has been stored. The method also recovers the hidden secret using a recovering module and the custodian module.