207results about "Secret communication" patented technology

Techniques for enhancing a security level of a communication message m, wherein the sending unit is configured to send the message m to a receiving unit over a communication path T; wherein a PLS-component of the sending unit (110, 130) adds artificial noise of a level NArt to the message m (215) to transform it to a communication signal x (40), in particular wherein the level NArt is designed to make the message m unreadable for an eavesdropper (90, 140) that has a worse signal-to-noise ratio than a legitimate receiving unit (110, 130), characterized in that the sending unit is configured to send the communication signal x (40) as a laser signal x (40).

A communication method, a first device, and a second device are provided. The method includes: receiving, by a first device, a wireless signal; and obtaining, by the first device, data reported by a second device by removing an interference signal from the wireless signal according to first information, where the first information is associated with the interference signal.

The invention provides an FD-RIS assisted covert communication method and system. The covert communication system comprises a base station, an FD-RIS, a covert user and an eavesdropper. According to the covert communication system, a time modulation technology is utilized to modulate a reflection coefficient of each reflection unit of the FD-RIS, and time delay is introduced in the time modulation process of each reflection unit; the method comprises the steps that an optimization problem is solved, the optimization problem takes maximization of the reachable rate of a hidden user as an optimization target, time delay and time modulation frequency in each reflection unit are obtained with the time modulation frequency constraint of the FD-RIS, the time delay constraint of the reflection units in the FD-RIS and the hidden constraint as constraint conditions, and the time delay and the time modulation frequency in each reflection unit are obtained. According to the method, the concealment performance can be remarkably improved, and the challenge of'safety blind areas' faced by a traditional RIS auxiliary concealed communication system is dealt with.

The invention relates to an electric power communication system optimization technology, in particular to a physical layer security optimization method and equipment for a full-duplex multicarrier power line communication system, and the method combines a full-duplex technology and a time domain artificial noise auxiliary security strategy to construct a multicarrier power line communication system model with a relay; generating a safety rate maximization problem, designing a set of convex approximation method, and performing conversion and simplification of a non-convex optimization problem; designing an iterative solution algorithm, and jointly optimizing the confidential data of the source node, the confidential data of the relay node and the artificial noise power distribution matrix; and optimizing the physical layer safety performance of the full-duplex multi-carrier power line communication system based on the solved power distribution matrix. According to the communication scheme and the solved power distribution vector, the safety performance of the power line communication system is optimized, the limitation of the number of power transmission cables in the power line communication system is avoided, the safety rate maximization of the total transmitting power domain can be realized, and the technical problem that data in an existing multi-hop power line communication system is prone to leakage is solved.

The invention relates to the field of safety detection, and discloses a portable secret-related environment anti-eavesdropping and anti-photo stealing equipment detection device, which comprises a lower shell, an upper shell is mounted on one side of the lower shell, a thermal imaging scanning module is mounted in the middle of the upper shell, wireless detection modules are symmetrically mounted on one side of the upper shell, and the wireless detection modules are mounted on the other side of the upper shell. An endoscopic detection module, a nonlinear node detection module and a vibration spectrum analysis module are sequentially installed on the other side of the upper shell, a lens detection module is installed on the outer wall of the upper shell, handles are installed on the two sides of the lower shell, and a power module is installed at the bottom of the lower shell. The detection data of each sensor is collected in real time through the display control module, the weight of each mode is dynamically adjusted based on the environment change, and when it is detected that the false alarm rate of the wireless detection module is increased due to strong electromagnetic noise, the weight ratio is automatically reduced; and the weight of the nonlinear node detection module or the thermal imaging scanning module with higher anti-interference capability is synchronously improved.

The invention relates to the technical field of communication, and discloses an AI-based adaptive data encryption method and system, and the method comprises the steps: carrying out the frequency domain transformation analysis of an original data flow, and generating a spectrum distribution feature set; the carrier frequencies are screened through a dynamic frequency selection algorithm to obtain an optimal carrier frequency range; performing phase modulation on the data bit stream, and embedding the data bit stream into a subcarrier in an optimal carrier frequency range to generate a first encrypted data stream; when the interference intensity exceeds an interference threshold value, performing directional adjustment on a frequency deviation parameter according to an interference type, and generating a second encrypted data stream; dynamically adjusting the frequency distribution parameters according to the transmission distance data to obtain a frequency distribution parameter set; and performing adaptive modulation and spectrum shaping on the second encrypted data stream based on the frequency distribution parameter set, and outputting a hidden transmission data stream. The method has the following effect that the data hidden transmission capability and the receiving and restoring accuracy in a complex environment can be improved.

Method for encrypting a communication signal s(t) of bandwidth Bs to be transmitted by a transmitter, which is generated by M samples with an equidistant sampling rate R B is represented, where the M samples are divided alternately into N processing branches, resulting in N partial signals with a sampling rate of R B / N, where N ≥ 2, - where in a first processing branch the sample values ​​1, N +1, 2N +1, .... MN, - in a second processing branch the sample values ​​2, N+2, 2N+2,.... M-(N+1) and - in the N ten processing branch containing the sample values ​​N, 2N, 3N,... M, whereby the sample values ​​of each partial signal of the N processing branches are each converted into an analog partial signal, where the analogue partial signals in the N processing branches are multiplied by a key function shifted from processing branch to processing branch by Δt = 1 / Bs = 1 / (NΔf), where the key functions in the individual branches were initially orthogonal to each other, before their orthogonality was removed by applying a shift key, which imposed defined phase changes on the key functions, where the partial signals of all processing branches modified by the key function are added together to form an output signal s'(t) and sent.

The invention provides an information security transmission method and system for a multiplexing data bus, and relates to the technical field of information security, and the method comprises the steps: deploying a trusted noise node on the multiplexing data bus; a transmission feature vector of the information transmission request is read, the transmission feature vector is input into a generative twinning network for analysis, a twinning transmission feature vector is obtained, and the generative twinning network comprises a predefined similarity item and a corresponding preset similarity threshold value; and sending the information to a trusted noise node for processing to obtain a twin noise signal and a noise transmission protocol, and when an information transmission request is executed, performing interference security transmission on the twin noise signal based on the noise transmission protocol. The technical problem that in the prior art, a multiplexing data bus usually uses a static protection mechanism, the protection means is single, complex attacks are difficult to cope with, and the information transmission safety is insufficient is solved.

Systems and techniques are provided for wireless communications. For example, a process can include, obtaining a message for transmission to a receiving device, determining a plurality of beamforming weights for transmitting a portion of the message toward a direction of the receiving device. A number of beamforming weights is equal to a number of transmit array elements. Each beamforming weight corresponds to a respective transmit array element. A beamforming weight is configured to turn off a transmit array element during transmission of the portion of the message. The process can include outputting an array puncturing notification indicative of transmission of the portion of the message by the plurality of transmit array elements with the transmit array element corresponding to the beamforming weight turned off and transmitting the portion of the message by the plurality of transmit array elements with the transmit array element corresponding to the beamforming weight turned off.

Amplitude and phase error correction in a transceiver circuit is provided. In embodiments disclosed herein, a transceiver circuit is configured to equalize an input vector to thereby correct amplitude-amplitude (AM-AM) and amplitude-phase (AM-PM) errors across a modulation bandwidth of the wireless communication circuit. Unlike conventional methods where complicated memory digital predistortion (mDPD) coefficients must be defined and calibrated for each modulation frequency within the modulation bandwidth, the transceiver circuit is configured herein to eliminate modulation frequency dependency of the AM-AM and AM-PM errors. As a result, it is possible to correct the AM-AM and AM-PM errors across the modulation bandwidth with reduced complexity to thereby improve efficiency and linearity of the wireless communication circuit.

An interactive communication apparatus, which connects to a computer, comprises an interactive communication device, having a tag, that is removably placed on or adjacent to an interactive communication device holder, having a sensor, wherein the tag communicates information to the sensor. The interactive communication system enables a user to transfer, store or retrieve information about and / or to a person that is identified with that interactive communication device. Once the interactive communication device is placed on or adjacent to the interactive communication device holder, certain communication applications, which include, photo slideshow, chat, e-mails, music, videos, and RSS feed, launch. The user can terminate the applications by removing the interactive communication device from the interactive communication device holder. The user can access content related to a new person by placing another interactive communication device, that corresponds to the new person, on or adjacent to the interactive communication device holder.

An accessory for a smart device and a method from controlling the same includes at least one transducer per receiver of the smart device, each transducer physically located in close proximity to a physical location of each receiver. An amplifier outputs noisy frequency signals to each transducer at a power level sufficient to cause the signal-to-noise ratio at each receiver to be negative. A controller outputs the noisy frequency signals for each transducer to the amplifier according to a mode, the controller randomly hopping the noisy frequency signals for each transducer in a manner sufficient to prevent audio processing software associated with each receiver from being able to identify and cancel the noisy frequency signals.

A method for variable length decoding, the method including: receiving, in a default word length mode, at least one first data word having a default first word length; combining the received at least one first data word as a first portion of data; receiving, after the at least one first data word, a transition word indicative of transitioning to a variable word length mode; receiving, after the transition word, a first word length word indicative of a second word length; receiving, after the first word length word, at least one second data word having the second word length; and combining the received at least one second data word as a second portion of the data.

A multilayer printed circuit board for interconnecting pin(s) and semiconductor die(s) is provided. A multilayer printed circuit board for interconnecting pin(s) and semiconductor die(s) comprises a multilayer substrate and pin holder(s), die contact(s), and first interconnection structure(s) embedded in the multilayer substrate. The multilayer substrate comprises a bottom substrate layer, one or more core substrate layers, and a top substrate layer stacked in sequence. and each made of an insulating material. Each of the pin holder(s) has an end exposed from a top surface of the top substrate layer for plugging the pin into the pin holder Each of the die contact(s) has an end exposed from a bottom surface of the bottom substrate layer for being electrically coupled with a contact of the semiconductor die(s) Each of the first interconnection structure(s) is connected between and electrically couples a corresponding pin holder and a corresponding die contact.

Provided is a method for enabling speaker de-identification in public audio data by leveraging adversarial perturbation. The method may include receiving audio data associated with at least one voice sample. One or more of the voice sample(s) may be perturbed toward an edge of a decision boundary of at least one classifier model. One pitch of each voice sample may be perturbed to shift each voice sample across the decision boundary of the at least one classifier model to provide at least one de-identified voice sample. A media file with the at least one de-identified voice sample may be encoded. A system and computer program product are also disclosed.

The invention discloses an underwater acoustic communication method, device and equipment based on ship radiation noise, and a medium, and the method comprises the steps: mapping a to-be-transmitted bit stream to a codebook sequence which is constructed and optimized based on the ship radiation noise, and generating a transmission signal consistent with the characteristics of the ship radiation noise through signal shaping processing; a receiving end realizes signal matching identification and inverse mapping recovery of an original bit stream through preprocessing, interference compensation, correlation detection and energy combination, and the identification probability of a non-destination receiver on a communication signal is remarkably reduced by means of the disguise characteristic of a ship radiation noise imitating signal. According to the method, the problem that the communication rate is limited due to the fact that a steganography method depends on camouflage signal hiding capacity is solved, the defect that a traditional spread spectrum sequence is easily observed and detected for a long time is overcome, and the requirement of modern ocean engineering for underwater acoustic communication concealment is met.

This application provides a communication method and apparatus. The method includes: A first communication apparatus may modulate M to-be-sent bits by using a constellation diagram, to obtain a first modulation symbol, and modulate N bits by using the constellation diagram, to obtain a second modulation symbol, where a first bit sequence and a second bit sequence have different values at a first location, and a third bit sequence and a fourth bit sequence are the same; or a first bit sequence and a second bit sequence are the same, and a third bit sequence and a fourth bit sequence have different values at a second location; and the first bit sequence is a bit sequence corresponding to a real part of the first modulation symbol, the second bit sequence is a bit sequence corresponding to a real part of the second modulation symbol, the third bit sequence is a bit sequence corresponding to an imaginary part of the first modulation symbol, the fourth bit sequence is a bit sequence corresponding to an imaginary part of the second modulation symbol, and the first modulation symbol and the second modulation symbol are symmetrical along a horizontal axis or a vertical axis of the constellation diagram. In this way, randomness of bit sequences corresponding to two adjacent modulation symbols in the constellation diagram is improved, and difficulty in illegally demodulating a transmitted modulation symbol is increased, thereby improving security of communication between the first communication apparatus and the second communication apparatus.

The present disclosure provides a method for generating an isogeny-based ring signature. The method includes executing a setup algorithm to establish public parameters includ¬ ing a base elliptic curve, generating key pairs for a plurality of users, and executing a signing algorithm by a signer. The signing algorithm involves selecting a random isogeny, iteratively computing isogenies, scalar values, basis points, subgroups, and additional isogenies for users in a ring, computing signer-specific isogenies and subgroups, deriving a dual isogeny, and outputting a ring signature comprising the computed isogenies and basis points. The method enables generation of an anonymous ring signature based on isogeny computations over elliptic curves, providing enhanced security in cryptographic systems.

An antenna unit is configured to transmit and / or receive signals and is connected to transmitting / receiving unit via a signal cable. A control device is configured to adjust signal strength by modifying gain of the control device. A calibration signal is provided by the transmitting / receiving unit and the signal strength of the calibration signal is used to adjust the gain of the control device.

The embodiments of the present application provide a communication signal processing method, system, electronic device and storage medium, which belong to the field of communications. The method includes: obtaining an initial signal to be sent and the number of antennas of a transmitting antenna; determining a target modulation format of the initial signal from a plurality of preset low-capture modulation formats; generating a corresponding pseudo-random sequence according to the target modulation format and the number of antennas, and using the pseudo-random sequence as header information, performing low-capture processing on the header information to obtain target header information; obtaining initial payload data of the initial signal, performing low-capture processing on the initial payload data, and obtaining target payload data; generating an initial demodulation signal mapped to each transmitting antenna, performing low-capture processing on the initial demodulation signal, and obtaining a target demodulation reference signal; performing framing processing according to the target header information, target payload data and target demodulation reference signal to generate a target signal for transmission.

The application discloses a kind of multi-dimensional joint spacecraft covert control systems and evaluation methods, belong to satellite covert control technical field, including ground control station and spacecraft control terminal;Ground station antenna is connected with demodulation receiving unit one, demodulation receiving unit one is connected with control service function unit one, control service function unit one is connected with inter-station link unit, service flow selection unit one and internal and external perception unit one respectively, service flow selection unit one is connected with modulation transmitting unit one, modulation transmitting unit includes radio frequency transmitting module one etc..The application improves the robustness of covert control under complex confrontation environment, while ensuring system performance, with strong adaptability, high reliability and other advantages, improve the covert performance of control system in complex environment.

Frequency shift of a clock signal The present description relates to an electronic device (200) configured to apply a frequency shift function to a first signal (Clk_F) having a first frequency (F) comprising: - a delay element (206) adapted to provide a second signal (Clk_F_D) corresponding to the first signal delayed by a duration equal to a first period of said first signal (Clk_F) divided by four; - a branch successively comprising a first circuit (201) adapted to divide the frequency of a signal by a number, a second integrator circuit (203), said branch being adapted to provide a third signal (Q_comp) and a fourth signal (I_comp); and a third single-sideband mixer circuit (208). Figure for abstract: Fig. 2

[Problem] To provide an optical secure communication system with higher safety by carrying a QNSC signal using a coherent Hermite-Gaussian pulse, multiplexing the QNSC signal using coherent Hermite-Gaussian pulses of different orders, and adding a masking effect in a time domain. [Solution] An optical secure communication system for a quantum noise stream cipher (QNSC) signal for masking the phase and / or the amplitude level of an optical signal using quantum noise, wherein carrier light in a transmission unit and locally oscillated light in a reception unit of the QNSC signal comprise a coherent Hermite-Gaussian pulse with an amplitude given by an Hermite-Gaussian function.

A method is disclosed in which an analog message signal is received at a finite length. An analog key signal having a finite length at least as long as the analog message signal is also received. An encrypted carrier is generated, and then an encryption operation is initiated to encrypt the analog message. First, an encrypted carrier is modulated with an analog key signal to generate an encrypted dynamic carrier. The analog message signal is then mixed with the encrypted dynamic carrier, where the mixing process is initiated at the initial key start point and the initial message start point of the analog key signal. An encrypted message signal is output from the mixing process, the encrypted message signal having a start point consistent with both the message start point and the key start point and an encrypted message end point consistent with the encrypted message signal end point.

A security system is a system for connecting communication between a first communication unit and a second communication unit through a communication line. The security system includes: a signal deformation unit that deforms a signal waveform of a communication signal transmitted during communication; and a signal correction unit that corrects the signal waveform deformed by the signal deformation unit.

The application proposes a downlink network physical layer security optimization method based on an ISAC system. First, the application proposes a physical layer security modeling method combining ISAC sensing capability under the condition of non-perfect eavesdropper CSI, which combines the norm boundary of ISAC sensing capability with the non-perfect CSI of the eavesdropper. Secondly, the application uses an alternating optimization algorithm to decouple the optimization variables and simplify them into a simpler form. Finally, the application uses a continuous convex approximation algorithm to solve the non-convex characteristics in the optimization problem of the base station beamforming auxiliary variable and the signal-to-noise ratio auxiliary variable parameter optimization of the eavesdropper, and realizes the physical layer security optimization in the downlink network. The application can enhance the security of the downlink network based on the ISAC system, and has excellent performance under different sensing performance requirements and total transmit power conditions.

A method and apparatus for selecting frequency modulated continuous wave waveform parameters for multiple radar coexistence by a user equipment is described. The user equipment may transmit a radar waveform consisting of a number of chirps, with each chirp having a same duration. The user equipment may vary waveform parameters of the radar waveform for at least a subset of the number of chirps, where the waveform parameters may be chosen from a codebook comprising at least one codeword of parameters. Reflected radar waveforms are received and processed where the processing includes applying a fast time discrete Fourier transform to reflected radar waveforms to produce a one dimension peak in a time delay dimension for each reflected waveform; and applying a slow time discrete Fourier transform to the reflected radar waveforms, where peaks for the reflected waveforms are added.

The application provides a kind of multiplex data bus information security transmission method and system, it is related to information security technical field, method includes: in multiplex data bus deployment trusted noise node;Read the transmission characteristic vector of information transmission request, input generation twin network and carry out analysis, obtain twin transmission characteristic vector, generation twin network includes predefined similarity term and corresponding preset similarity threshold value;Send to trusted noise node for processing, obtain twin noise signal and noise transmission protocol, when executing information transmission request, twin noise signal is interfered with based on noise transmission protocol and safely transmitted.The application solves the technical problem that the multiplex data bus in the prior art usually uses static protection mechanism, the protection means is single, it is difficult to deal with complex attack, leading to insufficient information transmission security.

The present application provides a method for realizing covert information transmission in a power line network, comprising the following steps: a transmitter prepares covert information to be transmitted to a receiver; the transmitter uses a determined transmission power to send the covert information to the receiver via the power line network; while receiving the transmitter signal, the receiver generates and transmits artificial noise to interfere with the eavesdropper's monitoring; the eavesdropper's false detection probability is evaluated to ensure that the eavesdropper cannot accurately determine whether the transmitter is transmitting information; on the premise of meeting the concealment requirements, the transmitter and receiver maximize the receiver's covert information reception rate by adjusting the transmission power; the covert interruption probability when the receiver receives the signal is analyzed and the concealment is evaluated, and based on the analysis and evaluation results, the system parameters are adjusted to optimize the covert transmission performance; the receiver decodes the received signal to recover the covert information sent by the transmitter; and the integrity and accuracy of the information received by the receiver are verified.