23 results about "Pseudo randomness" patented technology

The invention relates to a radar waveform design method for suppressing an autocorrelation sidelobe based on multi-carrier phase coding. The method comprises the following steps: acquiring a chaos sequence with pseudo-randomness; according to the chaos sequence, an OFDM method and a phase encoding method are adopted for processing, and an MCPC radar signal is obtained; according to the MCPC radar signal, the power difference between a maximized target and a sidelobe peak value, the minimum peak value sidelobe level and the minimum integral sidelobe level are accurately measured for processing, and a pulse compression sidelobe of the radar signal is obtained; pulse compression sidelobes of the radar signals are processed in a subcarrier amplitude windowing mode, and radar signals of multi-carrier phase coding suppression self-correlation and cross-correlation sidelobes are obtained; the self-correlation sidelobe is taken as an optimization target, and a genetic algorithm is adopted to optimize a carrier weighted window function to reduce the self-correlation sidelobe. The radar signal designed by the method has good anti-interference performance and sidelobe reduction performance.

The invention discloses a hyperchaotic image encryption method and system based on dual memristor cascade coupling, a medium and equipment. The method comprises the following steps: S1, constructing a hyperchaotic system based on dual memristor cascade coupling; s2, acquiring a plaintext image, performing hash processing on the plaintext image to obtain a key, and converting the key through a preset mathematical model to obtain an initial value of the hyperchaotic system; s3, iteratively operating the hyper-chaotic system based on the initial value of the hyper-chaotic system to generate a first chaotic sequence, a second chaotic sequence and a third chaotic sequence; and S4, performing encryption operation on the plaintext image by using the first chaotic sequence, the second chaotic sequence and the third chaotic sequence to obtain a ciphertext image. According to the invention, a hyperchaotic system is constructed based on double memristor cascade coupling, a chaotic sequence with high pseudo-randomness is generated, scrambling-diffusion-scrambling structure encryption is carried out on a plaintext image through the chaotic sequence, and then a ciphertext image with high security, high randomness and high anti-noise capability is generated.

Systems and methods support segmenting and encrypting a data object. For instance, a computing system may segmented data object into multiple chunks and then encrypt each of the chunks according to pseudo-randomly selected encryption algorithms. A result is that the data object has been split into multiple encrypted chunks, where the encrypted chunks have some amount of pseudo-randomness in their encryption.

The present invention relates to the technical field of information transmission. More specifically, it relates to a dynamic diffusion chaotic image encryption and decryption method and system based on Raspberry Pi and NTRU algorithm. The key points of its technical solution are as follows: S1. Generate a random initial sequence based on the size of the initial image; S2. Substitute the random initial sequence into a three-dimensional digital domain chaotic system to generate a chaotic matrix; S3. Encrypt the chaotic matrix to obtain a ciphertext image; S4. Input the ciphertext image into a decryption algorithm to obtain a plaintext image. The present invention combines the excellent chaos and pseudo-randomness of the high-dimensional digital domain chaotic system to design a chaotic image encryption algorithm with dynamic characteristics, improving the security of the image encryption algorithm.

The invention belongs to the technical field of software protection, and particularly relates to a control flow confusion method based on Gilbreath conjecture. According to the method, the opaque predicate based on the Gilbreath sequence is constructed, and a control flow flattening and dynamic assignment mechanism is combined, so that the control flow structure is recombined, and the code logic shows the characteristics of high complexity and difficulty in analysis. According to the method, the mathematical characteristics of the Gilbreath conjecture are utilized, so that the generated opaque predicate has the characteristics of pseudo-randomness and low predictability, and the anti-analysis capability of control flow confusion is enhanced. Experimental results show that compared with a traditional confusion method depending on simple grammar replacement or rearrangement, the opaque predicate based on the Gilbreath conjecture constructed by the method can effectively enhance the complexity of control flow confusion, so that a reverse analysis tool is difficult to recover original execution logic. Meanwhile, compared with a traditional confusion method, on the premise that high safety is guaranteed, the influence of confusion on the program running efficiency is reduced, and good practicability and adaptability are achieved.

The invention discloses an image interference method based on a novel chaos PGD algorithm, and relates to the technical field of image interference. On the basis of the PGD algorithm, in combination with the pseudo-randomness, bounded ergodicity and complex dynamic characteristics of a chaotic system, by introducing chaotic initial disturbance and chaotic variable step size, in combination with the characteristics of no target attack, and by adding a PSNR mechanism, the chaotic PGD algorithm overcomes the parameter limitation in the traditional PGD algorithm, the algorithm performance is remarkably improved, and compared with the traditional PGD algorithm, the algorithm performance is improved. The chaos PGD algorithm has the advantages that after interference is applied to the same input image, a target detection model can generate the same error detection result, but different prediction probabilities are output, and even completely different error detection results are caused.

The invention provides an unmanned inspection method and system for a hydropower station, belongs to the technical field of data processing, and is used for ensuring the randomness of an inspection route by screening pseudo-randomness brought by signals. The method comprises: a management plane entity receiving respective signal quality of M detection terminals fed back by a wireless access point, the M detection terminals being terminals discretely deployed in a hydropower station park, the signal quality being signal quality of wireless energy transfer for the M detection terminals by the wireless access point at a target time; the management plane entity determines K detection terminals of which the signal quality meets a preset condition from the M detection terminals; the management plane entity determines an inspection route of the unmanned aerial vehicle terminal for inspecting the hydropower station park in the inspection time period, the inspection route comprises the positions of the K detection terminals, and the inspection time period comprises a time period after the target time and with effective signal quality.

The invention discloses a pseudo-random number generation method, computing equipment and a pseudo-random number generator, and the method comprises the steps: determining an initial state according to a random number seed; multiple rounds of iteration generation are conducted through the initial state, multiple pseudo-random numbers are generated, any round of iteration generation specifically comprises the steps that a preset permutation function is used for conducting permutation processing on the generation state corresponding to the current round, a processing result is determined, the generation state of the first round is the initial state, and the generation state of the second round is the initial state; the permutation function has pseudo-randomness; and intercepting the processing result, determining the pseudo-random number corresponding to the current round, and taking the processing result as the generation state corresponding to the next round of the current round, so that the pseudo-random number stream with the side channel attack defense capability can be quickly and efficiently generated under the condition of not replacing the random number seed. The method can cope with a large amount of requirements of pseudo-random numbers meeting security in scenes such as privacy calculation and the like.

The invention discloses a chaotic sequence generation method and system based on cosine index discrete memristors and a data chaotic encryption method.In the chaotic sequence generation method, two cosine index discrete memristors are connected in parallel to form a chaotic mapping system, and outputs of the two cosine index discrete memristors are linearly scaled and then added to obtain a chaotic value; the chaotic value of each iteration is obtained through multiple iterative calculations, the chaotic values of each iteration are arranged in sequence to obtain a chaotic sequence, and the system is used for realizing the chaotic generation method. And performing operation on the obtained chaos sequence and plaintext data to realize chaos encryption of the plaintext data. The chaos sequence generated by the method has good pseudo-randomness, so that the security is improved when the chaos sequence is used for data encryption.

The invention discloses an RGB-D image encryption and decryption technology based on two-dimensional hyper-chaotic mapping and quaternion discrete cosine transform. The encryption method comprises the following steps: 1) designing a new two-dimensional hyper-chaotic mapping 2D-FLM through composite Fuch mapping and Logistic mapping; 2) carrying out RGB-D image encryption processing based on two-dimensional hyperchaotic mapping 2D-FLM and quaternion discrete cosine transform; and 3) carrying out RGB-D image decryption processing. According to the technology of the invention, through quaternion discrete cosine transform, an RGB image and a depth image are uniformly expressed as a quaternion vector for encryption processing, so that collaborative transformation and unified encryption of heterogeneous multichannel data are realized, and encryption operation is executed by adopting designed 2D-FLM mapping. The pseudo-randomness and the unpredictability are enhanced while the key space (10116) of the system is expanded, and common password attacks can be effectively resisted; according to the encryption strategy, dynamic characteristic parameters related to the plaintext are introduced in the key design, so that the key and the plaintext content are tightly coupled and can dynamically change along with the input image, known plaintext attacks and selected plaintext attacks can be effectively prevented, and the security and reliability of the system are further enhanced.

The invention discloses a cooperative positioning self-adaptive motion control method and system based on PSO mixed output, and belongs to the technical field of motion control systems.The cooperative positioning self-adaptive motion control method based on PSO mixed output comprises the following steps that S1, system modeling is conducted, and a mathematical model of a cluster motion control system is established. The Tent mapping can generate a sequence which is seemingly random but actually uniformly distributed in a given interval through a simple mathematical iterative formula, and the characteristic enables an initial population generated based on the Tent mapping to cover a wider solution space, so that the algorithm is effectively prevented from falling into a local optimal trap at the initial stage, and the algorithm efficiency is improved. And the pseudo randomness of the Tent mapping means that the generated sequence has certain unpredictability, so that the algorithm can maintain enough exploration capability in the search process, the global search efficiency and convergence precision of the algorithm are further improved, and the Tent mapping is introduced into the GWO algorithm as a random number generation mechanism.

The application discloses a random number generation method, device and electronic equipment. The method comprises the following steps: in response to a first instruction of a target object, acquiring wideband data and a timestamp of a terminal device; determining the number of layers of a target model according to the wideband data and the timestamp, and determining the target model based on the number of layers, wherein the target model is used to represent binomial coefficients arranged in the form of a target geometric figure; and generating a random number according to the target model, wherein the random number is used for data encryption at least. The application solves the technical problem that most of the random numbers generated in the prior art are pseudo-random numbers, which cannot guarantee the security of the random numbers.

The present application provides a method and system for unmanned inspection of a hydropower station, belonging to the field of data processing technology, and used to ensure the randomness of an inspection route by filtering the pseudo-randomness brought by signals. The method includes: a management plane entity receives the signal quality of each of M detection terminals fed back by a wireless access point, wherein the M detection terminals are discretely deployed within the hydropower station park, and the signal quality is the signal quality of the wireless access point transmitting wireless energy to the M detection terminals at a target time; the management plane entity determines K detection terminals whose signal quality meets preset conditions from the M detection terminals; the management plane entity determines an inspection route for an unmanned aerial vehicle terminal to inspect the hydropower station park within an inspection time period, wherein the inspection route includes the locations of the K detection terminals, and the inspection time period includes a time period after the target time when the signal quality is valid.

The invention discloses an encryption mode suitable for a wireless ad hoc network, which comprises an encryption pattern generation process and an encryption process, each working frame of an encryption pattern is updated once in the whole network according to a synchronous frame number, and a synchronous encryption method and a key can be quickly used without a complicated negotiation mechanism; an encryption pattern is generated by using an LFSR pseudo-random algorithm and is allocated to each time slot, so that the flexibility is improved, and the pseudo-randomness is extremely difficult to track, so that the concealment is enhanced; the data encryption method comprises the following steps: controlling a message, and carrying out full-field sending encryption and receiving decryption according to an encryption pattern M; the encryption mode of the data message, the data encryption offset position and the encryption length improve the data encryption efficiency; the PDU head carries out encryption synchronization through encryption and decryption by using the encryption pattern m; and the PDU data adopts at least two encryption modes, so that the encryption concealment is improved. By quickly updating the encryption pattern and the LFSR algorithm, the encryption efficiency and flexibility are improved, the overhead and risk are reduced, and the method is suitable for the dynamic environment of the wireless ad hoc network.

This invention discloses a multi-scroll conservative chaotic system and pseudo-random signal generator. Its technical features include the following steps: Step 1: Establishing a multi-scroll conservative chaotic system that satisfies Hamiltonian energy conservation and volume conservation, exhibiting strong ergodicity and pseudo-randomness; Step 2: Conducting NIST testing to verify the ability to generate pseudo-random signals that meet three standard conditions; and Step 3: Verifying the physical feasibility of the system using FPGA technology. This invention provides a multi-scroll conservative chaotic system model and pseudo-random signal generator for application research in image encryption and information encryption.

This invention discloses an integrated detection and interference waveform design method based on chaotic sequences. It utilizes the Logistic mapping in a one-dimensional chaotic sequence to design a chaotic binary phase-coded signal sequence. An integrated transmitted radio frequency signal is designed using this chaotic binary phase-coded signal sequence, leveraging the strong pseudo-randomness of chaotic sequences to suppress noise interference against non-cooperative signals. Upon detecting a non-cooperative signal, the integrated signal transmitter transmits the integrated signal into space according to the same pulse repetition period, number of pulses, and carrier frequency as the detected signal. The radar receiver performs down-mixing, digital sampling, and matched filtering on the received signal to extract echo delay and Doppler frequency information, and performs constant false alarm rate (CFAR) detection. This invention achieves reliable interference functionality while ensuring radar detection capabilities by utilizing a chaotic sequence generation method.

The invention discloses a language data translation method and system based on visual process configuration, which can realize safe key distribution based on quantum key negotiation and based on an inaccurate measurement principle and an unclonable theorem of quantum mechanics, and radically solve the problem of key leakage. Chaotic mapping has extreme sensitivity and pseudo-randomness to an initial value and a control parameter, and a sequence generated by the chaotic mapping can be used for encryption parameter optimization, so that the anti-cracking capability is improved; and the visual process configuration can meet the customized requirements of the user.

The invention relates to a device and to a method, in particular to a computer-implemented method, for the distributed generation of relevant pseudo-randomness, in which a set of instances for secret sharing of a function is specified, each instance comprising a pair of a function of sub-information for calculating the relevant pseudo-randomness and an input value for the function, wherein a splitting of the set into the subset is provided (902), the splitting enabling calculation of the result of the plurality of instances at least partially in a temporally overlapping manner, the transmission of at least one message via the communication connection being prompted, or performing at least partially temporally overlapping calculations (904) of results from at least a portion of the instances of the subset for distributed generation of related pseudo-randomness in response to receipt of at least one message via the communication connection, wherein the at least one message includes or identifies a program for distributed generation of associated pseudo-randomness based on the splitting.

The invention discloses a network security transmission method and system based on policy hopping and a firewall. The network security transmission method based on policy hopping and a firewall comprises the following steps: a first terminal obtains a message to be sent; the first terminal performs hopping processing on the to-be-sent message so as to obtain the to-be-sent message of which the source port and the source address are replaced; the first terminal sends the to-be-sent message with the replaced source port and source address to a first terminal gateway; and the first terminal gateway verifies the obtained to-be-sent message of which the source port and the source address are replaced, and sends the to-be-sent message to the second terminal gateway after the to-be-sent message passes the verification. According to the network security transmission method based on policy hopping and the firewall, the source ip and the source port of the data packet are modified by adopting an ipsec packet mode, and no capital expenditure is needed. The strategy hopping feature has pseudo-randomness, so that the feature cannot be predicted through an algorithm, and the threshold and difficulty of attacking an internal system by an external attacker are increased.

Systems and methods support segmenting and encrypting a data object. For instance, a computing system may segmented data object into multiple chunks and then encrypt each of the chunks according to pseudo-randomly selected encryption algorithms. A result is that the data object has been split into multiple encrypted chunks, where the encrypted chunks have some amount of pseudo-randomness in their encryption.

The present invention discloses a method for generating and optimizing a composite modulation signal with non-uniform frequency and phase, which can make up for the drawbacks of single modulation signals and conventional composite modulation signals. Frequency modulation is performed between signal sub-pulses, and arbitrary phase coding modulation is performed within sub-pulses. Moreover, the number of chips and widths of each sub-pulse can also be different, dynamically allocating the time domain and frequency domain information of the signal, increasing the design freedom and signal complexity, improving the radar anti-jamming and low intercept performance. Even if the radar signal is intercepted, it is difficult to extract the important features of the signal. And based on the coordinate descent method and the cost function diversity method, the signal parameters are searched and optimized to improve the pseudo-randomness of the signal and the target detection ability under clutter background.

The application discloses an image interference method based on a chaotic PGD algorithm and relates to the technical field of image interference.The application is based on a PGD algorithm, combines the pseudo-randomness, bounded ergodicity and complex dynamic characteristics of a chaotic system, introduces chaotic initial disturbance and chaotic variable step length, combines the characteristics of a non-target attack, adds a PSNR mechanism, so that the chaotic PGD algorithm overcomes the parameter limitation in the traditional PGD algorithm, and the algorithm performance is significantly improved.Compared with the traditional PGD algorithm, the advantage of the chaotic PGD algorithm is that, after the same input image is interfered, the chaotic PGD algorithm can make a target detection model produce the same error detection result, but different prediction probabilities, and even lead to completely different error detection results.

The present invention discloses an encryption method suitable for wireless ad hoc networks, including: encryption pattern generation and encryption process. The encryption pattern is updated network-wide once per working frame according to the synchronized frame number, allowing for rapid use of synchronized encryption methods and keys without requiring a cumbersome negotiation mechanism. The encryption pattern is generated using an LFSR pseudo-random algorithm and assigned to each time slot, increasing flexibility. The pseudo-randomness is extremely difficult to track, enhancing concealment. A data encryption method is used for control messages, and full-field transmission encryption and reception decryption are performed according to the encryption pattern M. The encryption method for data messages, including data encryption offset position and encryption length, improves data encryption efficiency. The PDU header is encrypted and decrypted using the encryption pattern M for encryption synchronization. The PDU data uses at least two encryption methods to enhance encryption concealment. By rapidly updating the encryption pattern and LFSR algorithm, the present invention improves encryption efficiency and flexibility, reduces overhead and risk, and is suitable for dynamic environments of wireless ad hoc networks.