493 results about "Check digit" patented technology

The invention discloses an OBD tamper-proof two-way verification method, which comprises the steps of obtaining OBD equipment data and vehicle sensor data, registering to a cloud end based on the OBD equipment data, obtaining registration data, obtaining key data and non-key data according to the vehicle sensor data, symmetrically encrypting the key data by using a session key in the registration data, and verifying the key data and the non-key data. Performing approximate homomorphic encryption on the non-key data, obtaining a double-entropy source dynamic salt value according to the time entropy of the ciphertext and the OBD equipment operation entropy, reversely reconstructing the dynamic salt value by the cloud according to the timestamp and the registration data, verifying the ciphertext structure by using the dynamic salt value and generating a random challenge containing a salt value check code, and sending the random challenge to the cloud; the equipment verification result and the challenge value are signed and then transmitted back, the OBD equipment carries out reverse verification on the salt value according to the signature and the equipment verification result, and the cloud generates an authority token based on the reverse verification result. According to the method, the data authenticity and integrity of the diagnostic equipment are guaranteed through packet encryption, dynamic salt value generation and bidirectional identity verification of transmission data.

The invention discloses a high-speed camera data self-adaptive two-stage caching system and method and a storage medium, and relates to the technical field of machine vision high-speed imaging and high-speed data storage, a preprocessing unit is used for performing deserialization and parallel connection, ROI cutting and gain adjustment on collected item number data, and writing incremental FrameID and cyclic redundancy check codes into each frame; the DDR annular cache unit comprises a monitoring module, a decision module and an execution module; the decision module is used for calculating an instantaneous cache demand Cnew and a dynamic cache occupancy U; the execution module expands and shrinks an annular buffer space in a single shot through a DDR4 controller, and outputs a Hi / Lo mark in real time through an occupancy rate comparator to drive an NVMe queue manager. According to the invention, on the premise of zero extra burden in a normal working condition, millisecond-level automatic capacity expansion and high-speed flood discharge can be realized in a sudden working condition, and real-time frame-level integrity verification can be completed on a local FPGA (Field Programmable Gate Array) side. The patent is subsidized by national key research and development plans, and the project number is 2023YFF0719700.

The invention discloses a data management method and device, electronic equipment and a medium, and the method comprises the steps: responding to obtained transmission data of first equipment, extracting the transmission data, and obtaining a check code and equipment information; when it is confirmed that the transmission data is qualified according to the check code, desensitizing the transmission data, and determining an encryption confidentiality level mode corresponding to the transmission data according to the equipment type indicated by the equipment information; according to an encryption method corresponding to the confidentiality level, encrypting the desensitized transmission data by adopting an encryption mode to obtain encrypted data; performing desensitization processing and identification processing on the encrypted data to obtain encrypted identification data after desensitization processing; and storing the encrypted data identification data after the desensitization processing to a target storage area. The method can be applied to the business fields of financial science and technology, medical health, old-age care and the like, the overall data safety is improved, privacy protection of sensitive information is increased, meanwhile, the data management and tracing capacity is improved, and balance between safety and performance is achieved.

The invention provides an automatic vehicle damage assessment method and system based on video segmentation in vehicle insurance claim settlement. The method comprises the following steps: constructing a chain hash and a digital signature by taking an accident video as input, and detecting secondary compression and frame pulling; a shared trunk and double-branch network is adopted to complete part damage segmentation, and optical flow and re-identification are combined to keep cross-frame consistency and refine a mask; under the calibration of a license plate, a hub and a marked line, a monocular depth and part curvature prior estimation recess depth and normal disturbance are fused; calculating quantitative indexes such as scratch length, scratch width, paint removal area, crack span and the like according to component topology, and performing grade evaluation; the evaluation result is mapped to a part BOM, man-hour and price library, replacement, repair and spraying schemes and cost details are automatically generated, a structured report containing key frame superposition and check codes is output, and video-level stable quantification, evidence traceability and automatic loss assessment are achieved.

The invention relates to the technical field of intelligent power grids, and provides a remote software upgrading method for an intelligent electric energy meter, which comprises the following steps: S1, a server generates an upgrading package containing a version identifier, and transmits the upgrading package to the intelligent electric energy meter in a fragmented manner through a TLS encryption channel; s2, the intelligent electric energy meter doubly verifies the integrity of the upgrade package and the legality of the source through an SHA-256 check code and a digital signature, the upgrade package and the source legality are written into a backup storage area of the Flash memory after verification is passed, and a CRC write-in check value is recorded; s3, performing secondary verification on the upgrade package of the backup storage area, triggering restarting after verification is passed, and writing data of the backup area into the main partition in the restarting process; s4, if the main partition system is not started or the core function is abnormal within the set time, returning to an old version and generating a fault log containing a timestamp; through a dynamic subpackage strategy, differential upgrading, SHA256 verification, a watchdog mechanism and a fault log record, the upgrading efficiency and safety of the intelligent electric energy meter are remarkably improved, and the dynamic subpackage strategy dynamically adjusts the size of a data packet according to the network condition.

The embodiment of the invention relates to the technical field of data transmission security detection, and provides a data transmission detection method and device, electronic equipment and a medium, and the method comprises the steps: receiving target data which is transmitted by a transmitting end and carries a first check code, and obtaining the character length of the first check code; when the character length of the first check code does not meet the integral multiple of the parallelism degree of a cyclic redundancy check algorithm, a preset method is adopted to verify the first check code, and the preset method is a method for carrying out data frame tail zero padding and then backspacing on the first check code; and carrying out transmission anomaly detection on the target data based on a verification result of the first check code. Therefore, processing delay is greatly reduced, resource occupation and power consumption are reduced, and cost is reduced.

The invention provides a controller, method and device for verifying stored data and a storage medium. The controller obtains a data writing instruction and a verification writing instruction; in response to the data writing instruction, writing the to-be-written data block into the first memory; in response to the write verification instruction, obtaining a to-be-read data block based on the read address; calculating a read address and a to-be-read data block to obtain a write check code; the to-be-read data block is a part of the to-be-written data block; obtaining a read verification instruction; in response to the read verification instruction, obtaining a read data block from the first memory based on the read address; calculating a read address and a read data block to obtain a read check code; and comparing the write check code with the read check code to obtain a comparison result. According to the technical scheme, whether the read data block is abnormal or not can be checked by calculating the read data block and the read address corresponding to the read data block, and therefore safe operation and performance of the ADAS chip are guaranteed.

The invention relates to a false comment detection method, belongs to the technical field of Internet information security, and mainly solves the problems of incomplete data acquisition, single feature modeling, slow model updating and rigid threshold judgment in the prior art. According to the method, comment text data are collected in real time through a distributed crawler system, non-language characters are filtered through a preprocessing module, the text length is standardized, and a three-dimensional feature set containing semantics, user behaviors and time-space association is extracted; a double-layer dynamic classification model is adopted for training; dividing a training set and a verification set based on a sliding time window, starting incremental learning and adjusting parameters of a full connection layer when the cosine similarity of new data and historical features is lower than 0.7, calculating weighted values of median and upper quartile in real time through a dynamic threshold module to judge abnormal comments, and generating a structured detection report with a hash check code. The method is suitable for real-time monitoring and risk management and control of online platform false comments, and the detection efficiency and accuracy are improved.

The invention provides a dynamic coding and decoding negotiation method based on link state quality. The dynamic coding and decoding negotiation method comprises the following steps: grouping reference station RTCM data and determining the priority of the RTCM data according to the message ID of the RTCM data; based on the determined first strategy selection mode, the RTCM data is subjected to check code generation, character coding and encryption in sequence, and the strategy selection mode of the base station is synchronized to a strategy selection module of the moving station; after the moving station receives the data, decryption, character decoding and verification are sequentially carried out on the encrypted data based on the information synchronized by the strategy selection module; meanwhile, the moving station counts the packet loss rate and the verification failure rate of the RTCM data in real time; and adjusting the strategy selection mode of the next group of data according to the quality of the current link, the system load and the priority of the RTCM data until all grouped data are sent. According to the invention, a real-time closed loop is provided, and the link quality is evaluated more comprehensively.

The invention discloses a high-capacity file encryption method and system based on block processing. According to the method, a high-capacity file is read and encrypted in blocks according to the fixed size, the situation that the high-capacity file is wholly loaded to a memory is avoided, memory occupation is reduced, and efficient encryption is achieved; two symmetric encryption algorithms of SM4 and AES are supported, and the corresponding algorithm is automatically identified and called during decryption by embedding an algorithm identifier in an encrypted file; and generating a check code for the encrypted file by using SM3 for integrity check before decryption. A file path coding mode irrelevant to a platform is adopted, a Unicode path is supported, and mainstream operating systems such as Windows and Linux can be compatible; and meanwhile, a buffer area and a multi-thread mechanism are introduced, so that file I / O operation and encryption calculation are executed in parallel, and the encryption efficiency is improved by utilizing the advantages of a multi-core processor. According to the method, the problems of high memory occupation, inconvenience in algorithm switching, poor cross-platform compatibility and low encryption efficiency of high-capacity file encryption are solved, and the method has a wide application prospect.

The invention discloses a riser card updating method and equipment, and relates to the technical field of data processing. According to the method, updating is initiated through the interface of the basic input and output system, and the first memory of the basic input and output system stores the first firmware file, so that updating depending on the management interface of the substrate management controller is avoided, and even if the substrate management controller fails, the basic input and output system can still be started up to complete updating; the first firmware file is stored in the first memory, so that the first firmware file can be prevented from being maliciously tampered. Besides, under the condition that the first check code is consistent with the second check code, the first firmware file is written into the corresponding adapter card, the integrity of the first firmware file written into the adapter card is ensured, and the problem that the adapter card fails due to firmware damage is completely eradicated.

The invention discloses a lightweight identity authentication and data security interaction method, system, equipment and medium for a protection measurement and control device, and relates to the technical field of power system information security. The method comprises the steps that the protection measurement and control device and an edge gateway carry out bidirectional identity authentication based on a preset shared master key and random numbers generated by the protection measurement and control device and the edge gateway; after the authentication succeeds, the two parties derive a session key of the communication based on the random number; between the protection measurement and control device and the edge gateway, service data is encrypted by using a session key, an integrity check code is generated, and a security data message is constructed for transmission; the receiver performs integrity verification and decryption on the security data message to obtain plaintext data; and receiving a key updating instruction from the cloud based on the secure channel, and performing secure updating on a preset shared master key. According to the invention, a mechanism of combining the pre-shared master key with the dynamic session key is adopted, so that the complex certificate chain verification overhead of a PKI system is avoided.

The invention relates to the field of data transmission, and provides a time series data cross-gatekeeper two-way transmission method, device and equipment, and the method comprises the steps: configuring an Internet of Things database cluster and an isolation gatekeeper, and determining a configuration result; according to the configuration result, the sending end is started to package the time sequence data, a data packet containing redundancy check information is generated, and the redundancy check information comprises a double-length field and a check code; transmitting the packaged data packet to a receiving end through an isolation gatekeeper; after the receiving end receives the data packet, verifying the dual-length field and the check code, if the verification is passed, returning a success signal, otherwise, returning a failure signal; and if the sending end receives the failure signal, automatically retransmitting the data packet until a successful signal is received or a preset retry condition is met. The problem that in the prior art, cross-gatekeeper time sequence data transmission cannot meet the requirements for high safety and real-time performance at the same time is solved, and safe and reliable time sequence data two-way real-time transmission under the strict network isolation condition is achieved.

An apparatus may receive a first copy, a second copy and a third copy of data including a cyclic redundancy check (CRC) code, determine that a number of one or more bit positions, at each of which at least two of the first copy, the second copy or the third copy have bit values different from each other, is greater than a threshold value, divide the one or more bit positions into a first set of bit positions corresponding to the threshold value and remaining bit positions, determine, among the remaining bit positions, a second set of bit positions at each of which both the second copy and the third copy have a same bit value different from a bit value at a corresponding bit position of the first copy, and correct, using the second set of bit positions, an error in the first copy.

The invention discloses a lossless compression storage method and system based on heterogeneous data in a credential environment, and the method comprises the steps: firstly, extracting a mapping relation between a file type and a structural feature through scanning a target file, carrying out the preliminary lossless compression after classification and grouping, and further employing a sliding window matching and sequence matching algorithm to optimize compressed data for a redundancy mode, and then generating a metadata structure containing a check code and a compression parameter, packaging the metadata structure into a data packet supporting cross-platform transmission, finally transmitting the data packet to a target storage device through a secure write-in protocol, and verifying data consistency and recovering path feasibility by using the check code. According to the method, the data compression efficiency is remarkably improved, the compatibility of cross-platform transmission and the integrity of stored data are ensured, and efficient and reliable technical support is provided for complex electronic file processing.

The embodiment of the invention provides a batch retrieval method based on a verifiable bloom filter and electronic equipment, and relates to the technical field of data security. The method comprises the following steps: converting a server data set into a key value pair form, and mapping keywords in the data set in the key value pair form into equal repeated codes through an equal repeated code mapping algorithm to obtain an equal repeated code data set; determining a storage position of a second verifiable bloom filter according to a keyword in the equal-repetition-code data set, and storing a data entry corresponding to the keyword in the equal-repetition-code data set and a check code generated based on the data entry to the storage position; the client receives the query keyword set and maps the query keyword set to the first verifiable Bloom filter; and taking each bit of the first verifiable Bloom filter as a selection vector to execute an oblivious transmission protocol to obtain a return result of the server side. The embodiment provided by the invention provides a safe and efficient batch retrieval method based on the verifiable Bloom filter.

This disclosure describes systems, methods, and devices related to enhanced connectivity. A device may receive a data payload and modulation and coding scheme (MCS) information for transmission. The device may select a low-density parity-check (LDPC) codeword size based on the data payload size and the MCS information. The device may encode the data payload into at least one LDPC codeword according to the selected LDPC codeword size. The device may transmit the encoded LDPC codeword using a wireless interface.

The invention relates to the technical field of insurance data security encryption, and discloses an insurance data security encryption method. The method comprises the following steps: firstly, constructing a heterogeneous graph according to insurance applicants and insurance policy and claim settlement records, extracting a sub-graph of each insurance applicant to reflect a complete service context, then calculating the connectivity of each node according to an ascending order of an insurance policy number and a claim settlement number, and constructing a degree vector; a degree value is converted into a binary system with a fixed bit width, the binary system is spliced and folded to generate a sub-graph key with a fixed length, a linear congruence permutation parameter is calculated by a key specific bit to construct dynamic mapping, and basic information and claim settlement details of an insurance applicant are grouped and filled to the fixed length after unified serialization; performing byte-level replacement on each group of data and then performing cyclic right shift; and finally, adding a user identifier and grouping element information at the front end of a ciphertext and adding a check code at the tail to form self-description and verifiable complete encryption output. According to the scheme, the key and service binding enhancement randomness, cracking resistance and data integrity are ensured.

In some implementations, an apparatus may receive a first copy of payload data and a corresponding first cyclic redundancy check (CRC) code, and a second copy of the payload data and a corresponding second CRC code. Each of the first copy and the second copy may be encrypted with an identical keystream. The apparatus may decrypt, using the keystream, the first copy to obtain first decrypted data and the second copy to obtain second decrypted data, append the first CRC code to the first decrypted data to form first data, append the second CRC code to the second decrypted data to form second data, determine one or more bit positions, at each of which the first data and the second data have bit values different from each other, and correct, based on the one or more bit positions, an error contained in the first data.

The invention belongs to the field of computer software and system maintenance, and particularly discloses a software state management and upgrading method and system supporting multi-mode deployment, and the method comprises the steps: collecting a service operation state and resource use data of software, carrying out the comprehensive research and judgment of the service operation state, storing the service operation state, and carrying out the service restart based on a research and judgment result; receiving the software package, calculating a check code of the software package, and storing and recording the information data of the software package, the check code and the storage path in a database based on a preset path; a software upgrading instruction sent by a front end is received, the storage path of the target software package and the stored check code are obtained from the database, and the integrity of the target software package is checked; and deploying the target software package to a specified path, recording upgrading information, and closing the old version service to start the new version service. The operation and maintenance efficiency and safety of software management can be improved.

The invention provides a software registration serial number encryption generation method in the field of data security. The software end and the authorization end are internally provided with the same character code mapping tables H1 and H2. In the encryption process, information such as a hard disk serial number is encoded into P0 with 25 characters, four characters are randomly selected from an H1 table to serve as a dynamic password, P0 is sequentially mapped and encoded according to rules to obtain P4, a check code of one character is calculated, and finally a serial number with 30 characters is generated. During decryption, the serial number is firstly disassembled, P0 is decoded according to rules after verification is passed, and hardware and software information is obtained through splitting and analysis. According to the method, the serial number is endowed with high uniqueness and unpredictability through a complex encryption algorithm and multiple hash operations, the ciphertext is still visible characters, the ciphertext is provided with a dynamic password and verification data, safety and convenience are both considered, and the method is particularly suitable for serial number transmission and software authorization management.

The invention relates to the technical field of vehicle networking safety, in particular to a vehicle-mounted TBOX data interaction safety optimization system which comprises an OTA update packet safety construction and verification module, an OTA update fault recovery and reliability guarantee module and a vehicle-mounted communication threat detection and grading response module. Wherein the OTA update packet security construction and verification module calculates an original hash value corresponding to original firmware, constructs a header and signs, derives a key to obtain encrypted firmware and a check code, and groups an update packet; verifying the credibility of an update source, extracting a public key to verify the signature and decrypt the hash, and deriving the same key; comparing the check code to judge that the firmware is complete; the OTA update fault recovery and reliability guarantee module divides a vehicle-mounted storage medium into an operation partition, a backup partition and a recovery partition, receives a reminding signal, writes firmware in the backup partition and performs dual verification, presets five types of rollback conditions, and sets triple protection; and the vehicle-mounted communication threat detection and grading response module outputs an abnormal probability and executes grading response according to a threshold value.

The invention discloses a remote online upgrading method and system for a distributed FPGA (Field Programmable Gate Array) system, and belongs to the technical field of FPGA upgrading. The PC machine transmits an updating instruction and data of firmware to the address mapping module of the main control FPGA board card through a PCIE interface, the main control FPGA board card distributes the updating instruction and data of the firmware to the address mapping module of the sub FPGA board card through the Ethernet controller, and the sub FPGA board card receives the updating instruction and data of the firmware and then sends the updating instruction and data to the Flash control module; the sub FPGA board card reads firmware data and calculates a local CRC value, the local CRC value is compared with a check code issued by the PC, and if the CRC value is checked to be consistent, the jump switch command continues to be executed, and a Flash head control bit is switched to a new version of firmware; cache-free real-time data flow writing, multi-board parallel upgrading and a safe backspacing mechanism are realized, and the upgrading efficiency and the system reliability in a complex heterogeneous environment are remarkably improved.

An apparatus may receive a first copy, a second copy and a third copy of data including a cyclic redundancy check (CRC) code, determine a set of bit positions, at each of which at least two of the first copy, the second copy or the third copy have bit values different from each other, perform a bit flip on the first copy at one or more bit positions to generate second data, calculate a number of operations for calculating respective sums of CRC syndromes corresponding to a plurality of sets of one bit position, two bit positions or three bit positions, among the set of bit positions, determine that the number of operations does not exceed a threshold, and correct, based on flipped bit positions among the set of bit positions in the second data and the respective sums of CRC syndromes, an error contained in the first copy.

The invention provides a data transmission method, a check code generation system and a storage medium, and the data transmission method applied to a data receiving end comprises the steps: receiving and analyzing a data frame, and analyzing transmission data and a first check code; calculating a second check code according to the transmission data; when the first check code and the second check code are the same, using the transmission data; wherein the step of generating the second check code comprises the following substeps: converting transmission data into binary check code generation data, splicing the binary check code generation data, and dividing the obtained spliced data according to a preset length to obtain a plurality of pieces of first block data; performing a first type of operation on each first block of data; and converting each first block data into decimal second block data, performing a second type of operation on each second block data, generating a second check code based on an operation result, and outputting the second check code. According to the data transmission method applied to the data receiving end, the problem that the abnormal all-zero data frame received by the receiving end passes verification can be avoided.

The invention provides a method for adapting a satellite-borne domestic NAND Flash to a yaffs file system, which comprises the following steps: designing a block conversion mechanism, and converting a physical address of the domestic NAND Flash into a logic address conforming to MTD specifications through an address conversion algorithm to ensure that the file system can be correctly identified and managed; read-write operation is adjusted according to specific characteristics of the domestic NAND Flash, data correctness and performance optimization are ensured, and efficient management and compatibility improvement of the non-standard NAND Flash are achieved. An adaptation layer is developed, it is ensured that the yaffs file system can recognize and process the characteristics of the domestic NAND Flash, a bottom layer drive is driven, adjusted and modified to meet the MTD interface specification, meanwhile, the unique function of the domestic NAND Flash is reserved, and the system based on the domestic NAND Flash can smoothly operate the yaffs file system; an error correction mechanism based on an RS (Reed-Solomon) code is introduced, a check code is calculated and stored together with original data during data writing, so that error correction is performed during reading, an efficient decoding algorithm is designed, errors of any 8 bytes in 256 bytes can be corrected, and meanwhile, the performance overhead is minimized.

The invention discloses a color QR code generation method and system based on AES-RSA dual encryption, and relates to the technical field of data encryption, and the method comprises the steps: carrying out the byte filling and segmentation of a preprocessing data package; performing AES encryption operation on each data block based on the AES key and the initialization vector to obtain a complete AES ciphertext; filling the AES key packet by adopting an OAEP filling method; encrypting the key packet filled with the OAEP by adopting an RSA public key to generate an identifier; obtaining a hybrid ciphertext packet based on the complete AES ciphertext, the key packet and the identifier; the mixed ciphertext packet is divided into three equal parts, check codes are added, three sections of mixed ciphertext data with the check codes are obtained, priority coding is carried out, and a QR code dot matrix is generated; and obtaining a final color QR code based on the color mapping function and the QR code dot matrix. According to the invention, the security of data transmission is improved, and the information capacity of data transmission is increased.

The invention discloses an intelligent data verification method and device and related equipment. The method comprises the steps of obtaining a field type, a partition key and a partition data size of a target Hive table; generating a field filtering expression based on the rule engine and the field type of the target Hive table; generating a cascade check condition based on the partition key of the target Hive table; generating a verification rule based on the field filtering expression and the cascade verification condition; fragmenting the data of each partition based on a storage space of a storage block on the distributed file system and the size of the data of each partition; and verifying each piece of fragmented data to obtain a target global check code. According to the method and the device, when the Hive data before and after migration are verified, the non-scalar fields in the Hive table are filtered out by setting the field filtering expression, so that the tolerance to small errors during verification is improved; when the verification is executed, each piece of partition data is fragmented, and each piece of fragmented data is verified in parallel based on the plurality of computing nodes of the distributed cluster, so that the verification efficiency can be improved.

The application discloses a lossless compression storage method and system based on heterogeneous data in a Xinhua environment, first extracts the file type and structure feature mapping relationship by scanning the target file, classifies and groups, and then carries out preliminary lossless compression, further adopts a sliding window matching and sequence matching algorithm to optimize the compressed data for the redundant mode, then generates a metadata structure containing a check code and compression parameters, encapsulates into a data packet supporting cross-platform transmission, finally transmits to the target storage device through a secure write protocol, and verifies the data consistency and recovery path feasibility by using the check code. The application significantly improves the data compression efficiency, ensures the compatibility of cross-platform transmission and the integrity of storage data, and provides efficient and reliable technical support for complex electronic file processing.

The present application relates to the field of communication technology, especially to a CRC check code generation circuit, wherein the first input end of the jth first calculation unit is used for receiving the jth data block of current data to be processed, when j=1, the second input end is used for receiving data 0, when j>1, the first input end is used for receiving the output data of the j-1th first calculation unit. The jth first calculation unit is used for generating output data, which is transmitted to the first input end of the jth exclusive or unit. The jth second calculation unit is used for generating output data, which is transmitted to the second input end of the jth exclusive or unit. The jth exclusive or unit is used for generating output data, which is transmitted to the jth input port of the J-way selector; the J-way selector is used for selecting the kth input port and outputting the CRC check code. The present application can reduce the combination logic resources occupied by the CRC check code generation circuit and improve the operation frequency of the CRC check code generation circuit.