9results about How to "Large key space" patented technology

The invention discloses an encryption communication method and system based on biological genetic coding chaos driving, and the method comprises the steps: receiving an original bit stream and an initial secret key, and generating a chaos sequence group according to the initial secret key through two hyperchaos models; performing DNA coding encryption on the original bit stream by using the chaos sequence to obtain a gene transmission sequence, and performing DNA decoding on the gene transmission sequence to obtain a transmission bit stream; performing constellation mapping on the transmission bit stream to obtain a constellation diagram, and performing subcarrier scrambling, symbol scrambling and constellation rotation on the constellation diagram according to the chaos sequence; performing OCDM modulation on the constellation diagram through an inverse discrete Fresnel transformation matrix to obtain a transmission signal; hiding the initial key in a frame header of a transmission signal, and sending the transmission signal to a receiver through a transmitter; according to the invention, multi-layer encryption of the OCDM signal and dynamic secret key follow-up transmission are realized.

The invention discloses a color image encryption method based on dynamic constraint holographic coding, and the method comprises the encryption steps: firstly, coding a color plaintext image into a pure phase hologram based on dynamic constraint holographic coding, and then converting the pure phase hologram into a conversion amplitude through phase-to-amplitude conversion; finally, the converted amplitude is encrypted into a visible ciphertext image by using an iterative phase retrieval algorithm under structured light illumination, and a diffraction neural network is generated at the same time; and a decryption step: firstly, generating decryption structured light by using the decryption structured phase mask to illuminate the visible ciphertext image, carrying out forward diffraction propagation, generating a reconstruction amplitude after phase modulation of the diffraction neural network, and then converting the reconstruction amplitude into a conversion phase through amplitude-phase conversion, and finally, performing color holographic reconstruction decryption on the converted phase to obtain a color decrypted image. The color image encryption method provided by the invention has the advantages of large key space, high security and high concealment.

This invention proposes a chaotic speech encryption method based on a time-frequency dual-track system, belonging to the field of speech encryption technology. The method includes: preprocessing the original speech data to obtain a mono-channel filtered speech signal; extracting parameter features and calculating normalized speech energy as input to the chaotic system; generating a chaotic sequence and performing multi-step enhancement to obtain an enhanced key stream; generating a scrambling index after Fourier transforming the speech signal; scrambling and reshaping the real and imaginary components in the frequency domain and performing XOR diffusion; recombining the encrypted frequency domain matrix and inversely transforming it back to the time domain; and obtaining the final ciphertext through index permutation and fusion of speech feature parameters. This invention uses a frequency-domain dual-track scrambling-diffusion mechanism combined with an attractorless six-dimensional conservative hyperchaotic system to generate an enhanced key stream, thus avoiding speech distortion in time-domain encryption, triggering a global avalanche effect, and simultaneously improving the algorithm's resistance to various attacks, ensuring both the security of speech encryption and the fidelity of speech restoration.

This invention discloses a multi-image encryption method based on 3D face keys and multiplexed digital holography. The encryption steps include: using 3D face high-order data acquisition technology, chaotic face structured light phase mask generation technology, grating modulation technology, multiplexed digital holographic coding technology, and watermark embedding technology based on discrete wavelet domain singular value decomposition, multiple plaintext information images can be encrypted into an amplitude-type holographic ciphertext and embedded into a host image; the decryption steps include: the user must first calculate the face similarity using a 3D face multilayer perceptron neural network. If the similarity exceeds a preset threshold, authentication is successful. Then, the final decryption result is generated using watermark image extraction technology based on discrete wavelet transform, image decryption technology based on the Cramer-Kroni relation, and spectral filtering technology; otherwise, authentication fails. This method has advantages such as a large key space, high sensitivity, strong robustness of the 3D face key, and low decryption crosstalk.

An encryption method based on a switching inertia neural network with leakage time lag relates to the field of audio encryption. It solves the problem that the existing encryption method that relies on neural networks adopts a fixed network structure and a static processing mechanism, resulting in the encryption effect being limited by the model performance. The switching inertia neural network with a mixed time-varying delay and leakage time lag constructed by the present invention is used as an audio encryption drive system; and an audio decryption response system is constructed based on the designed synchronization controller and the audio encryption drive system; the subsequent encryption and decryption process is realized under the condition of global exponential synchronization controlled by the synchronization controller. The existence of multiple time lags forms a mixed time-varying delay, and the dynamic behavior of the system is more difficult to predict. The introduction of the time lag inertia weight factor makes the encryption process more complicated, has stronger resistance to randomness and reversibility, and the design of the synchronization controller greatly increases the difficulty of cracking. It is mainly used for the encryption of audio data.

The present invention provides a multi-key image encryption method based on a five-dimensional conservative hyperchaotic system, comprising: constructing a five-dimensional conservative hyperchaotic system; generating a chaotic pseudo-random sequence for the first scrambling based on a plaintext image; scrambling the plaintext image according to the chaotic pseudo-random sequence for the first scrambling; generating a pseudo-random sequence for forward diffusion and a pseudo-random sequence for reverse diffusion based on the first scrambling graph; diffusing the first scrambled image according to the pseudo-random sequence for forward diffusion and the pseudo-random sequence for reverse diffusion; generating a chaotic pseudo-random sequence for the second scrambling based on the diffusion graph; scrambling the diffusion graph according to the chaotic pseudo-random sequence for the second scrambling to generate a ciphertext image. The present invention designs a multi-key image encryption algorithm using a wide initial value range of the system, solves the key leakage problem and the chaotic sequence utilization problem, and thus improves the security of image encryption.

The invention provides a hyperchaotic image encryption method based on magic cube three-dimensional space parallel rotation scrambling, and the method comprises the steps: generating a pseudo-random sequence as a preprocessing parameter, an Arnold transformation parameter and a magic cube scrambling parameter through a seven-dimensional hyperchaotic system, and carrying out the preprocessing of an R channel, a G channel and a B channel of a plaintext image through the pseudo-random sequence, the Arnold transformation parameter and the magic cube scrambling parameter, then, Arnold transformation is controlled by a pseudorandom sequence to scramble the preprocessed image so as to improve the defect that data aggregation easily occurs during subsequent scrambling of the three-dimensional magic cube, then, an obtained two-dimensional chaos matrix is converted into a three-dimensional matrix, a rotating shaft, the number of rotating layers and the rotating angle are dynamically selected by the pseudorandom sequence, and the three-dimensional chaos matrix is obtained. And parallel rotation scrambling of the magic cube three-dimensional space is carried out. According to the method, the image pixel values are mapped to all the small cubes contained in the whole Rubik's cube for three-dimensional space scrambling, and the characteristics of the three-dimensional structure of the Rubik's cube are better utilized, so that the scrambling complexity is improved, the safety of the ciphertext image is improved, the key space is larger, and the scrambling effect is better.

The invention belongs to the field of data encryption, and discloses a face image data encryption method based on chaotic tent mapping, which comprises the following steps: S1, setting an initial state of a chaotic system; s2, receiving a face image and an initialization parameter, and generating an initial seed; s3, scrambling and diffusing the face image to obtain encrypted images R ', G' and B 'of R, G and B channels; s4, respectively carrying out DNA coding on R ', G' and B 'to obtain vectors RDNA, GDNA and BDNA; s5, respectively mixing the RDNA, the RDNA and the RDNA to obtain encrypted vectors R 'DNA, G' DNA and B 'DNA; and S6, decoding and combining the R 'DNA, the G' DNA and the B 'DNA to obtain an encrypted face image. According to the invention, the security and reliability of the algorithm are improved. And the complexity of the encryption process is remarkably improved while the algorithm efficiency is kept. According to the invention, through the nonlinear characteristic of the chaotic system and the randomness of DNA coding, a defense mechanism for a known attack mode is enhanced.

The present invention belongs to the field of signal transmission technology, and specifically is a method for transmitting multidimensional data confidentially during track laying. Transmission is performed through a multidimensional data confidentiality transmission system, and the multidimensional data confidentiality transmission system includes various sensors for collecting operation data, a unified data processing unit, a data encryption processing unit, a data cloud platform, and a data decryption processing unit; the following steps are included, S100: the sensors corresponding to the track laying equipment collect the operation data of various types of equipment in the track laying process; S200: after the operation data is fixed by floating point numbers and data arrangement operations are performed in the unified data processing unit, the data vector is encrypted in the data encryption unit; S300: the encrypted data is transmitted to the data cloud platform, the data monitoring center receives the ciphertext data from the data cloud platform, decrypts the data, and parses the decrypted data to obtain the operation data of each device. The present invention improves the security and the operation speed of the system, has a large key space, and can resist attacks.