3 results about "Chaotic map" patented technology

With the popularity of the Internet and cloud computing technology, image data in the process of transmission and storage is facing unauthorized access, malicious tampering and data theft and other security threats. In order to protect the image information from being stolen and improve the security in the process of network transmission, the application proposes an image scrambling method based on dynamic Joseph ring. First, a one-dimensional chaotic map is used to generate a pseudo-random sequence with high randomness and is integerized; second, the original image I is processed by vector flattening, the Joseph ring structure is constructed and dynamic Joseph scrambling is performed; finally, the pixel sequence after scrambling is reconstructed into a two-dimensional image matrix to obtain the encrypted image E . Experimental results show that the method has strong security and good encryption effect, which can ensure the security of image information in the process of network transmission.

The application relates to the field of information security and image protection technology, and provides a non-adjacent coupling chaotic image encryption method, a decryption method and a system based on two-stage optimization, the encryption method comprising the following steps: performing two-stage evolutionary parameter optimization to obtain optimal parameters, in the first stage, performing global benchmark parameter optimization by using a differential evolution algorithm, and in the second stage, performing grid level heterogeneous parameter optimization based on a covariance matrix adaptive evolution strategy; performing plaintext correlation key generation operation and completing system parameter initialization configuration; generating a chaotic sequence fused with the optimized parameters; performing row and column overlapping double scrambling operation; performing interlaced diffusion processing on the chaotic sequence, and outputting the final ciphertext. The scheme not only greatly improves the chaotic complexity and the anti-attack ability of the system, but also satisfies the cryptographic security threshold of the key space, can effectively resist various password attacks such as differential attacks and statistical analysis, and can be applied to image data protection in high-security scenes.

This invention relates to a DVS data encryption method, decryption method, apparatus, and system, comprising: acquiring an original event stream E; using an initial key parameter K to drive a one-dimensional chaotic map and LIF neurons, extracting the chaotic pulse intervals corresponding to adjacent firing pulses of LIF neurons, and performing least significant bit purification processing to generate a binary key stream KS; based on the binary key stream KS, using Fisher-Yates shuffling traversal to generate a time rearrangement mapping table and a spatial permutation mapping table; sequentially extracting events from the original event stream E, using the binary key stream KS as the overall driver, relying on the time rearrangement mapping table and the spatial permutation mapping table to complete global scrambling of timestamps, one-dimensional flattening and permutation of spatial coordinates, and combining the binary key stream KS to generate a key mask, completing event polarity reversal, and obtaining an encrypted event stream E'. This invention can reduce system latency and reduce computational resources.