47 results about "Bitmessage" patented technology

The invention relates to the technical field of document anti-counterfeiting security verification, in particular to a multi-page two-dimensional code technology-based document content integrity anti-counterfeiting verification method, which comprises the following steps of: scanning an electronic document of a current page to obtain a document image, and converting an obtained original bit sequence into a two-dimensional code image to obtain a watermark embedded image; calculating text loss and a loss consistency coefficient; obtaining a target embedded block; obtaining a bit extraction sequence, bit information loss and a loss function; and carrying out iterative calculation on the loss function to obtain a watermark-embedded document image, printing the watermark-embedded document image, identifying the content of the two-dimensional code image in the printed document, comparing the consistency of the identification result and the original bit sequence, and carrying out anti-counterfeiting verification on the document content. According to the method and the device, the watermark embedding position can be reasonably selected, the possibility of document distortion is reduced, the distinguishing degree of characters and watermarks in the document is improved, and the accuracy of anti-counterfeiting verification of the document content is improved.

An example according to the present specification relates to a technique relating to a configuration of a preamble in a wireless LAN (WLAN) system. A transmitting STA may generate and transmit an EHT PPDU. The EHT PPDU may include an L-SIG field, an RL-SIG field, and a control field. A result of “modulo 3 operation” to a length field value of the L-SIG field may be set to “0”. The RL-SIG field may be configured the same as the L-SIG field. The control field may include 3-bit information relating to a version of a PPDU.

The invention discloses a covert communication system based on a generative diffusion model, and belongs to the technical field of covert communication. In order to solve the problems of insufficient concealment and poor anti-noise performance in the prior art, hidden transmission and reliable recovery of information are realized by constructing a diffusion generation and classification discrimination module. The sending end carries out noise addition and shaping on the original bit waveform by using a forward diffusion process to form a noise-like hidden signal; and a receiving end recovers a signal structure through a reverse denoising process, and accurately judges bit information through a classifier. According to the method, a Gaussian approximation hidden waveform library is constructed by adopting a signal pair training model which is consistent in statistics but distinguishable in structure, and random sampling mapping and boundary smooth splicing are combined, so that transmission signals are difficult to distinguish from noise in a frequency domain and a feature space; therefore, the avoidance capability, the anti-interference robustness and the information recovery accuracy under the low signal-to-noise ratio of the detection means are remarkably improved.

The invention discloses a digital domain dual scrambling method and device based on a time domain aperture. The method comprises the following steps: acquiring a key initial value and to-be-sent bit information; generating a disturbance sequence by adopting a new four-wing chaotic system according to the key initial value; sequentially performing OFDM modulation and QAM carrier mapping on bit information to be sent to obtain a carrier signal; carrying out carrier scrambling on the carrier signal by using the disturbance sequence to obtain a frequency domain signal; performing inverse Fourier transform on the frequency domain signal to obtain a time domain signal; performing time domain pinhole signal inversion on the time domain signal by using the disturbance sequence to obtain a time domain inversion signal; and after the time domain inversion signal is subjected to digital-to-analog conversion, an electric signal is modulated to light, and light transmission is completed. Double encryption on a digital domain is realized, so that the information has higher security in a transmission process, and the signal transmission performance is not influenced.

The invention relates to a self-adaptive information negotiation method applicable to a continuous variable quantum key distribution system, which comprises the following steps of: estimating an optimal code rate that an LDPC (Low Density Parity Check) code should reach under a current quantum channel, converting an initial code rate into the optimal code rate by a receiver, and obtaining a low-reliability bit number l which needs to be disclosed in conversion calculation, the method comprises the following steps of: decoding an LLR (Local Library Ratio) by using Bob, sending the LLR to Alice through a classic channel in combination with an encryption technology, sorting absolute values of the LLR by Alice in a decoding iteration process, selecting l bit positions with low reliability, sending the bit positions to Bob, determining a bit value by Bob according to the bit positions with low reliability sent by Alice, and feeding back and sending the bit value to Alice, and correcting the LLR value by Alice according to bit information sent by Bob. According to the method disclosed by the invention, the code rate of the LDPC code can be flexibly adjusted along with the change of the state of the time-varying channel, and the negotiation efficiency is improved, so that the key rate of the system is improved. The method is excellent in performance in a time-varying channel environment, negotiation efficiency under a low signal-to-noise ratio condition can be remarkably improved, and an efficient and reliable information negotiation scheme is provided for practical application of a quantum secret communication system.

The invention relates to the field of millimeter wave communication, in particular to a data transmission method and device based on a rate division multiple access technology, and the method comprises the following steps: inputting a bit information stream at a transmitter; performing block processing on the bit information stream; encoding the data stream subjected to the block processing; performing symbol mapping on the encoded data stream; pre-coding the data stream after symbol mapping to form a transmitting signal; a data stream is transmitted through a channel after a signal is transmitted through a transmitter, and a receiver receives the transmitted information stream, performs interference elimination on the data stream and obtains public information and private information of the information stream; and combining the public information stream and the private information stream to obtain a transmitted bit information stream. According to the invention, the bit data stream is split and combined at the transmitter, the frequency spectrum utilization rate in the information transmission process is increased, and the information transmission rate is improved.

The invention discloses a behavior execution method and device, a terminal, network side equipment and a medium, and belongs to the technical field of communication, and the behavior execution method comprises the steps that the terminal receives a PBCH payload sent by the network side equipment; the terminal executes a behavior corresponding to the PBCH payload according to the PBCH payload; wherein the PBCH payload at least comprises at least one of the following: frame information related to all SFNs; cell access restriction information; the first information is used for determining the type of a first module corresponding to the PBCH payload, and the first module is used for sending at least one of the synchronization signal and the PBCH; information on the type of the PBCH payload; and bit information of a PBCH payload.

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure relates to a method and device for reporting information related to channel state. In an aspect, there is provided a method performed by a user equipment (UE) in a communication system, including: determining one joint coding method from at least one joint coding method, and performing encoding based on information related to channel state information (CSI) obtained by the UE measuring a first channel using the determined joint coding method, to obtain bit information; reporting to a base station based on the bit information, wherein the joint coding method is derived based on information related to a second channel for CSI reporting.

This invention discloses a method, system, and apparatus for constructing low-correlation pilot sequences for satellite internet. The method includes: pilot detection using a zero-correlation domain shifted superposition pilot sequence set, and channel estimation; decoding using the SCJD algorithm to recover the remaining k-rb bits corresponding to no more than T conflicting terminals in each frame, and recovering the first rb bits of each UE using the pilot sequence obtained from pilot detection; and the satellite broadcasting a decoding status feedback message to all active users. This invention reduces the probability of pilot collisions, thereby achieving a lower access failure probability. Furthermore, this invention improves communication spectrum efficiency through the design of a data transmission protocol.

A communication method and device are applied to the technical field of communication. In the method, a terminal device sends a first signal obtained by modulating a first sequence and performing resource mapping on the modulated signal, the first sequence is obtained by modifying a Gold sequence bearing a source bit, and the bearing of the source bit by the Gold sequence is realized by respectively bearing part of bits in the source bit by two m sequences in the Gold sequence. In the method, the Gold sequence can bear more information bits, so that bit information with larger data volume can be transmitted.

This application relates to the field of document anti-counterfeiting security verification technology, and specifically relates to a method for anti-counterfeiting verification of document content integrity based on multi-page two-dimensional code technology. The method includes: scanning the current page of the electronic document to obtain a document image, converting the obtained original bit sequence into a two-dimensional code image to obtain a watermark embedding image; calculating the text loss and loss consistency coefficient; obtaining the target embedding block; obtaining the bit extraction sequence, bit information loss, and loss function; performing iterative calculation on the loss function to obtain the document image after watermark embedding, printing the document image after watermark embedding, and by identifying the content of the two-dimensional code image in the printed document, comparing the consistency between the recognition result and the original bit sequence to perform anti-counterfeiting verification on the document content. This application can reasonably select the position of watermark embedding, reduce the possibility of document distortion, improve the distinguishability of text and watermark in the document, and is conducive to improving the accuracy of anti-counterfeiting verification of document content.

The invention is suitable for the technical field of wireless communication, and provides a soft information generation method and device, electronic equipment and a readable storage medium. The method comprises the following steps: determining a constellation point interval of each constellation point based on actual complex values of a plurality of constellation points and theoretical complex values of the plurality of constellation points; according to the arrangement sequence of the bit information of each constellation point, taking the bit information with the same arrangement position of each constellation point as a group of target bits; based on the value of the bit information in each group of target bits, classifying constellation points corresponding to the bit information, and determining a first value set and a second value set of each group of target bits; and determining soft information of each group of target bits based on the first value set and the second value set of each group of target bits and the constellation point spacing of each constellation point. According to the soft information generation method provided by the embodiment of the invention, the calculation complexity of soft information detection is reduced, so that the operation requirement on a demodulator is reduced, and implementation on a hardware platform is facilitated.

An error correction code (ECC) system of a data storage device utilizes a joint decoding scheme to correct errors in a codeword when the codeword has failed a decoding process using a first decoding scheme. The ECC system uses information derived from the second decoding scheme to generate soft bit information, or reliability information, associated with a portion of the failed codeword. The soft bit information derived from the second decoding scheme is provided to the first decoding scheme when the first decoding scheme attempts to correct or decode the failed codeword.

The invention discloses a continuous variable quantum secret sharing method based on a state distinguishing detector. The method comprises the following steps: a user generates a binary key sequence; a QPSK state signal is generated; sequentially coupling the QPSK state signals through an asymmetric beam splitter; the Dealer uses the SDD to estimate the received signal; repeating the steps, and extracting an original combined key; obtaining an original key of each user based on a key sequence combination principle; and calculating a key rate, and extracting a key to complete encryption message decoding. According to the method, quantum state distinguishing is completed through a state distinguishing detector (SDD), and the SDD is allowed to directly determine bit information directly transmitted by different users by identifying mixed state categories, so that each user does not need to declare and discard respective original key subsets, a mapping rule is directly restored, key loss is reduced, and the user experience is improved. And the key rate performance of the SDD-CVQSS protocol is improved. In addition, compared with the traditional CVQSS, the SDD-CVQSS shows obvious advantages in key performance indexes of the key rate and the maximum transmission distance.

A receiver according to the present disclosure includes: a first modulation unit that modulates a phase of a reference light by using a reception base assigned so as to correspond to a transmission base assigned to each of a plurality of weak lights; a detection unit that detects a plurality of pieces of bit information from each of the plurality of weak lights interfered with by the reference light in which a base value of the reception base matches that of the transmission base; an extraction unit that extracts a plurality of pieces of bit information each having an amplitude component equal to or greater than a threshold; a prediction unit configured to predict a load status of the receiver based on information about a weather forecast; and an adjustment unit that adjusts the threshold in accordance with the predicted load status of the receiver.

The application discloses a digital domain double scrambling method and device based on a time domain small hole, and the method comprises the following steps: acquiring a key initial value and bit information to be sent; generating a disturbance sequence by using a new four-wing chaotic system according to the key initial value; sequentially performing OFDM modulation and QAM carrier mapping on the bit information to be sent to obtain a carrier signal; performing carrier scrambling on the carrier signal by using the disturbance sequence to obtain a frequency domain signal; performing inverse Fourier transform on the frequency domain signal to obtain a time domain signal; performing time domain small hole signal inversion on the time domain signal by using the disturbance sequence to obtain a time domain inverted signal; and modulating a telecommunication signal onto light after the time domain inverted signal is converted from digital to analog, thereby completing optical transmission. The double encryption in the digital domain is realized, so that the information has higher security in the transmission process, and the signal transmission performance is not affected.

Embodiments of the present disclosure provide a communication method, an electronic device, and a computer program product. The communication method comprises: a sending end acquires mapping relationships between different data streams of a communication system and a power allocation matrix obtained by fusion and dimensionality reduction; the sending end superimposes, on the basis of the mapping relationships, pilot data and original data to obtain aliased data; and the sending end acquires, on the basis of the aliased data, a signal to be transmitted, and sends said signal and said power allocation matrix to a receiving end, so that the receiving end acquires bit information of the original data.

Methods and apparatuses for performing a set of transmissions using polar coding with retransmissions using cross-block check blocks are described. A first transmission is performed at a first code rate, the first transmission including a first plurality of information blocks, each information block having a plurality of information bits. A second transmission is performed at a second code rate that is lower than the first code rate. The second transmission includes a set of cross-block check blocks generated using information bits selected from across a second plurality of information blocks. Each of the second plurality of information blocks is a subset of the information bits of a respective one of the first plurality of information blocks, the information bits of each subset being selected from least reliable bit channels of the respective one of the plurality of information blocks.

The present application relates to the field of GNSS satellite communication, and particularly relates to a data storage method, system, storage medium and electronic device.The method comprises the following steps: step 1, based on the Viterbi algorithm, the soft bit information is calculated to obtain the branch metric of each soft bit information, and the soft bit information is the information data after baseband processing; step 2, based on the branch metric, the surviving path is obtained; step 3, the index relationship between the surviving path and the current storage address corresponding to the surviving path is established; step 4, based on the index relationship, the surviving path is updated to the physical position of the current storage address. The method can effectively solve the problem that a large amount of resources are occupied due to separate storage of the calculation result in the prior art by replacing the position of the storage address, in addition, the calculation result can also be saved without affecting the data of other positions by replacing the physical position, so that the integrity of the data is ensured.

The present application relates to the technical field of communications, and discloses an operation execution method and apparatus, a terminal, a network side device, and a medium. The operation execution method of the embodiments of the present application comprises: a terminal receives a PBCH payload sent by a network side device; and on the basis of the PBCH payload, the terminal executes an operation corresponding to the PBCH payload, wherein the PBCH payload at least comprises at least one of the following: frame information related to all SFNs; cell access restriction information; first information, the first information being used for determining the type of a first module corresponding to the PBCH payload, and the first module being used for sending at least one of a synchronization signal and a PBCH; type information of the PBCH payload; and bit information of the PBCH payload.

This application provides a communication method and a communication apparatus, relating to the field of communications. In the method, a terminal device may request a first system information message required by the terminal device from a network device by using first information to avoid signaling overhead caused by the network device blindly broadcasting system information messages. When N types of system information messages exist, N bit information sets in the first information correspond to the N types of system information. After receiving the first information, the network device may determine that the terminal device requests a first system information message of the first type based on the first bit information set to which the first bit information belongs, and may transmit the first system information message of the first type. In this way, a method for requesting a system information message is provided, which avoids a situation in which the terminal device does not know how to request a system information message and the network device does not know the type of system information message requested by the terminal device.

Embodiments of the present application provide a communication method and apparatus, a device, a storage medium, and a program product. In the method, on the basis of a first reliability sequence of a first polar code, a coding apparatus determines a first bit position set from a first bit sequence for the first polar code. On the basis a second reliability sequence of a second polar code, the coding apparatus further determines, from a second bit sequence for the second polar code, a second bit position set to be updated. Moreover, on the basis of bit information corresponding to the first bit position set, the coding apparatus updates bit information corresponding to the second bit position set to obtain a third bit sequence. The reliability corresponding to the first bit position set is lower than the reliability corresponding to the second bit position set, or the second bit position set corresponds to a position set which is punctured or shortened in the first polar code. Therefore, the self-decoding time delay of a polar code can be reduced, the decoding efficiency is improved, and the throughput is improved.

According to the communication method, a receiving end device generates a bit sequence based on A information bits and the number nPC of PC bits, the bit sequence comprises N bits, the information bits and the PC bits are located at A + nPC positions with the highest sequence reliability in the bit sequence, and the PC positions where the PC bits are placed meet a first condition and a second condition, the first condition is that the minimum row weight of A positions where A information bits are located is not less than the minimum row weight of A positions with the highest sequence reliability in the bit sequence, and the second condition is that the kth high position number in nPC position numbers in the bit sequence is not less than the kth high position number in the set S3, the set S3 comprises nPC positions with the lowest reliability in A + nPC positions with the highest sequence reliability; and performing polarization coding on the bit sequence to obtain a code word sequence. According to the method, a PC bit placement mode for determining the requirement of a correct decoding path based on PC bits is provided.

Disclosed in the present application are a wake-up information transmission method and a communication apparatus. The method comprises: receiving a first signal, wherein the first signal is modulated on the basis of a first sequence, the first sequence carries wake-up information and / or bit information, and the bit information is part of the wake-up information. Using the method can improve reliability and resist fading.

The invention discloses a secret key recovery method of an SM2 signature algorithm based on lattice attack and a storage medium, and the secret key recovery method comprises the steps: S1, constructing a hidden number problem; s2, reducing the implicit number problem to a bounded distance decoding problem; s3, reducing a bounded distance decoding problem to a unique shortest vector problem; and S4, solving a unique shortest vector problem by adopting a screening algorithm with predicates, and recovering the implicit number to obtain a signature private key. According to the method, the problem of recovering a key d by an SM2 signature algorithm is reduced to a hidden number problem on the basis of bit information of the highest 1 (1 > = 2) bit of a random number obtained by side channel attack, then the hidden number problem is reduced to a bounded distance decoding problem, and the problem is further reduced to a unique shortest vector problem for solving through a Kannan embedding technology, so that the problem is solved; and finally, constructing a more efficient screening algorithm with predicates in combination with a small index test technology to solve a unique shortest vector problem, recovering implicit numbers, and obtaining a signature private key. According to the new method provided by the invention, the lattice attack overhead can be reduced, and the key recovery efficiency is improved.

The invention provides a communication method and device, which can be applied to a wireless personal local area network system based on an ultra wide band, including 802.15 series protocols, such as a 802.15. 4a protocol, a 802.15. 4 z protocol or a 802.15. 4 ab protocol and the like, and can also support a next generation Wi-Fi protocol of IEEE 802.11 ax, such as 802.11 be, Wi-Fi 7 or ultrahigh throughput, such as 802.11 b. The method comprises the following steps: a sending device sends a first signal to a receiving device, the first signal is used for indicating N bits, the value of each bit is determined by the high-low relationship between the average energy in two pulse burst intervals, and the receiving device determines to wake up the receiving device according to the first signal. According to the embodiment of the invention, the one-bit information is transmitted by adopting the two pulse burst intervals, and the receiving equipment can correctly demodulate the first signal, so that the receiving equipment can be effectively awakened.

The invention discloses a prime power RSA modulus decomposition method and system, a medium and equipment, and the method comprises the following steps: obtaining a value through the information of a part of high bits leaked by a private key, a prime power RSA modulus and a small public key index; recovering partial information of the prime number by using the obtained information, specifically comprising the following steps: constructing a modular equation to solve the value of the prime number; the method comprises the following steps: constructing two functions, and approaching a prime number in a binary search mode by using a size relationship of function values to obtain high bit information of a prime number part; constructing a first-order modular equation by using part of information of the recovered prime number, and recovering a complete prime number in combination with a Appersmith algorithm; and decomposing by using prime numbers and moduli. According to the method, less private key bit information is utilized, and modulus decomposition is completed, so that security analysis of the prime power RSA cryptographic algorithm is realized.

A communication method includes: determining to request a first system information message; and sending first information, wherein first bit information in the first information is used to request the first system information message, N bit information sets in the first information correspond to N types of system information messages, the first bit information belongs to a first bit information set comprised in the N bit information sets, the first system information message belongs to a system information message of a first type corresponding to the first bit information set, the N types comprise the first type, and N is an integer greater than 1.

This application provides a communication method and apparatus that can reduce the computational complexity of detecting information carrying a first bit, improve detection efficiency, and enhance communication performance. The method includes: determining a first signal based on a first sequence corresponding to the first bit information, wherein the first sequence is constructed based on the Kronecker product of a second sequence and a third sequence, the second sequence carrying the first bit of the first bit information and the third sequence carrying the second bit of the first bit information; and transmitting the first signal.

The present application relates to the field of wireless communications, and discloses a device access method and apparatus for an ambient energy system, a device, and a medium. The method is executed by an ambient energy device, and comprises: sending a first signal, the first signal comprising a first identifier and / or a second identifier, wherein the first identifier is used for indicating N-bit information randomly generated by the ambient energy device, N is an integer greater than or equal to 1, and the second identifier is used for indicating device identifier information of the ambient energy device. The method simplifies the access procedure, reducing the access delay.