15 results about "Key space" patented technology

This invention discloses a data storage method and system based on a scalable multidimensional learning index structure, belonging to the field of computer data storage. This system fully utilizes storage characteristics to organize data into memory and disk, significantly reducing disk I / O with minimal memory usage, accelerating data search speed, and supporting data expansion. This invention can be applied to multidimensional data indexing, typically represented by geospatial data, meeting the need for rapid multidimensional key searching in the high-dimensional key space of such data.

The application discloses a kind of multi-modal space-time alignment safe driving emotion recognition methods based on sensitive word guide.The application extracts sensitive word features by driving monitoring video and voice data.With the analysis sensitive word-voice text time attention, determine the multiple candidate time intervals that possibly exist emotion in video.With the sensitive word-visual time cross attention, adaptively determine the key time frame that exists driving emotion.In key time frame, extract component features in the multiple space regions of human face component, analyze its alignment relationship with voice sensitive word, with the sensitive word-visual space cross attention, adaptively determine the key space region that exists driving emotion.The application fully considers the space-time asynchronization of sensitive word in multi-modal data, sequentially analyzes candidate time interval, key time frame, key space region, gradually finds the key clue of driving emotion, and can effectively improve the accuracy of safe driving emotion recognition.

This disclosure provides a chaotic video encryption method based on a sliding encryption window, comprising: determining the sliding step size and dimensions of the encryption window according to the correlation between the initial value of the key stream and the frame content; dividing the video sequence frame by frame into a sliding encryption window to obtain the encryption region corresponding to each frame; dynamically adjusting the chaotic system parameters based on the pixel information within the encryption window to generate an encryption key stream; and applying the key stream to the pixels within the corresponding encryption window for chaotic scrambling and encryption. The scheme of this disclosure can provide feedback control of the encryption window division strategy based on the correlation between the initial value of the key stream and the frame content, thereby solving the problem of insufficient resistance to brute-force attacks caused by limited key space.

This invention discloses a method for secure encryption of medical data, relating to the field of data encryption technology. The method includes implementing access control based on security levels, acquiring original medical images after authorization verification, stacking the images into a three-dimensional cube by channels, dynamically dividing them into blocks according to security levels, generating a chaotic encryption key based on the block information, and performing encryption operations on each three-dimensional block to obtain encrypted ciphertext. By destroying pixel correlation through channel stacking and segmentation, combined with differentiated keys generated by chaotic mapping, the key space and encryption efficiency are significantly improved, effectively resisting brute-force and statistical attacks. Permutation and substitution operations enhance the randomness of the ciphertext, ensuring encryption adapts to security levels and operates in a closed loop, guaranteeing controllable access permissions, improving the targeting and security of medical image encryption, and enabling flexible access for authorized users while ensuring efficient data encryption.

A database system includes a commit layer implemented using a first set of host computing devices and a storage layer implemented using a second set of host computing devices. A control plane of the distributed database system determines a first sharding scheme for the commit layer and a second sharding scheme for the storage layer, wherein the first and second sharding schemes are not required to be the same. Also, in some embodiments, the second sharding scheme used for the storage layer enables overlapping key spaces across the shards of the storage layer, wherein various ones of the shards are optimized for different types of workloads.

A system and method for measuring latency is disclosed. In some implementations, the processor may include providing a switch API to process a plurality of microservices involved in a workflow and connected to a distributed in-memory keyvalue database, where the distributed in-memory keyvalue database further may include a plurality of key spaces. In addition, the processor may include managing configuration tools to track the latency of each microservice in the plurality of microservices. The processor may include programing data plane information of the microservices to create programmed data, where programming further may include collecting and analyzing data on the latency of each microservice of the plurality of microservices. Moreover, the processor may include feeding the programmed data into an ASIC.

The application relates to the field of optical encryption, and discloses an optical encryption device and method based on a communication mode. The device comprises a light source module, a modulation module, an optical 4f system, a source plane, a physical key module and a receiving plane; the modulation module is used for generating an encrypted light field located on the source plane; the encrypted light field is predetermined, and after being modulated by the physical key module, the encrypted light field can propagate to the receiving plane to recover a decrypted image. The application constructs an optical encryption system containing the physical key module from the source plane to the receiving plane, performs singular value decomposition on a coupling operator of the optical encryption system, obtains a group of orthogonal communication modes, superimposes the communication modes by weighting, constructs a target decrypted image on the receiving plane, and reversely determines the encrypted light field. The application introduces the concept of the communication mode, takes the optical encryption system as a key, provides a new encryption paradigm with theoretically infinite key space, and fundamentally improves the security of the optical encryption system.

The application provides a kind of intelligent filtering method, device, electronic equipment and storage medium for imminent journey, in the method, by introducing dynamic rule engine and key space-time feature extraction mechanism, the fine, real-time management of imminent journey is realized, effectively solve the technical bottleneck of traditional system check lag and threshold control extensive, not only significantly improve the accuracy and intelligent level of journey data processing-Through based on journey type identification dynamic determination safety buffer time window, and combining residual effective time window is compared in real time, to accurately filter high-risk imminent journey and optimize recommended sorting, avoid the waste of resources or recommendation failure caused by static threshold;At the same time, relying on the adaptability and personalized service ability of difference threshold configuration, the acquisition efficiency and recommendation conversion rate of effective journey information are improved finally while guaranteeing the fluency of user experience.

The present application is directed to the problem that static DNA encoding and calculation rules are single, encryption process is separated from plaintext, and plaintext is vulnerable to attack, and proposes a color image encryption method based on new 4-dimensional hyperchaos and DNA random encoding calculation. The method first designs a new 4-dimensional hyperchaotic system, iterates the system to generate multiple pseudo-random sequences, generates new pseudo-random sequences and matrices by calculation and modification, decomposes the color image into R, G and B channel components, and then fuses them into a matrix, then encodes and calculates the image and the pseudo-random matrix according to the newly generated pseudo-random sequence, and then performs DNA random decoding, decomposes the matrix into channel components, and fuses to generate the final ciphertext image, wherein the initial value of the chaotic system is calculated by the SHA-512 algorithm. The encryption method proposed by the present application not only has large key space and strong sensitivity to plaintext, but also can effectively resist statistical, brute force and differential attacks.

A database system includes a commit layer implemented using a first set of host computing devices and a storage layer implemented using a second set of host computing devices. A control plane of the distributed database system determines a first sharding scheme for the commit layer and a second sharding scheme for the storage layer, wherein the first and second sharding schemes are not required to be the same. Also, in some embodiments, the second sharding scheme used for the storage layer enables overlapping key spaces across the shards of the storage layer, wherein various ones of the shards are optimized for different types of workloads.

This invention discloses a system for accelerating read operations in a key-value storage system using a learned index, comprising a key space partitioning module, a learned index module, a data writing module, a data organization module, an index table update module, an index training module, a garbage collection module, a data retrieval module, a data reading module, and a dynamic index table module; the invention aims to improve the read performance of the system on high-speed storage devices.

The application relates to the field of information security and image protection technology, and provides a non-adjacent coupling chaotic image encryption method, a decryption method and a system based on two-stage optimization, the encryption method comprising the following steps: performing two-stage evolutionary parameter optimization to obtain optimal parameters, in the first stage, performing global benchmark parameter optimization by using a differential evolution algorithm, and in the second stage, performing grid level heterogeneous parameter optimization based on a covariance matrix adaptive evolution strategy; performing plaintext correlation key generation operation and completing system parameter initialization configuration; generating a chaotic sequence fused with the optimized parameters; performing row and column overlapping double scrambling operation; performing interlaced diffusion processing on the chaotic sequence, and outputting the final ciphertext. The scheme not only greatly improves the chaotic complexity and the anti-attack ability of the system, but also satisfies the cryptographic security threshold of the key space, can effectively resist various password attacks such as differential attacks and statistical analysis, and can be applied to image data protection in high-security scenes.

The application provides a security-enhanced chaotic communication system and method based on external time-domain self-feedback encryption, and relates to the technical field of chaotic communication carrier. The application utilizes two dispersion components and a phase modulator in the middle of dispersion to form an encryption module, and under the joint action of the encryption module, the encrypted chaotic signal is processed in time domain and phase. At the receiving end, the encrypted information is recovered in time domain and phase by using a symmetric decryption structure. Since the encryption module suppresses the time delay characteristics embedded in the chaotic carrier and the time delay characteristics in the electro-optical self-feedback phase loop, the eavesdropper cannot crack the time delay information by calculating the autocorrelation and mutual information, so the key parameters of the system cannot be intercepted, and since the dispersion value and the phase modulation depth in the encryption module are controllable variables, the key space of the system is further increased, so the security of the system is ensured.

This invention relates to the field of database systems and storage systems, and in particular to a writing method and apparatus based on a computable storage device. The method includes receiving a write transaction for a database; when the database is under non-write-intensive load, writing the flushed data corresponding to the write transaction to the actual storage area based on a B+ tree index structure; dividing the entire key space of the database into multiple partitions according to the range of keys, and for each partition, storing the key value falling into the partition and a pointer to the actual data in the leaf nodes of an adaptive radix tree, obtaining a multi-instance adaptive radix tree index structure; when the database is under write-intensive load, writing the flushed data corresponding to the write transaction to the virtual storage area of ​​the computable storage device based on the multi-instance adaptive radix tree index structure, and having the computable storage device complete the process of migrating the flushed data from the virtual storage area to the actual storage area. This invention can improve write performance.

The application provides a dynamic encryption imaging method and device based on orbital angular momentum speckle, and the method comprises the following steps: step 1, generating an initial Gaussian light beam output by a coherent light source, and adjusting the polarization state of the initial Gaussian light beam through a polarization control unit, and adjusting the aperture of the light beam through an expansion optical system; step 2, generating an orbital angular momentum vortex light beam corresponding to a topological charge number; step 3, forming an orbital angular momentum speckle field corresponding to the topological charge number one by one, and taking the orbital angular momentum speckle field as a dynamic encryption key; step 4, continuously illuminating a dynamic target and realizing information multiplexing coding; step 5, obtaining an encrypted intensity image carrying multiple frames of dynamic information; and step 6, outputting multiple frames of dynamic imaging results. The application realizes efficient optical encryption imaging of a dynamic scene under single-exposure conditions, and has the technical effects of large key space, strong controllability, simple system structure, strong anti-interference ability and the like.