Wavelet Transform And Chaotic Image Encryption Technology Research And Implementation

Makes extensive use of the color image,color image encryption has a greater value in use, color image encryption is becoming the hotspot. In recent years, many scholars have done a lot of research on the color image space domain encryption algorithm [4,5,9,15], while few studies on the encryption of the frequency domain. The space domain encryption algorithm is mainly about the position scrambling of2D grayscale image pixels, and then XOR the scrambling pixels. Its advantage is able to make full use of the image data matrix eigenvalue,calculation speed is high, the algorithm is intuitive and easy to understand. However, the destruction of the correlation between the pixels due to the encryption process, resulting in deterioration of the effect of image compression. Encrypted, based on the frequency domain image encryption algorithm for image after the wavelet transform coefficients according to the characteristics of the human visual system, only some important data encryption, significantly reduce the amount of the encrypted data, improved the encryption efficiency. At the same time, these algorithms can be good with the compression algorithm combines to reduce the amount of network data transmission.In order to strengthen the security of image encryption, use more complex and high-dimensional chaotic system.Relative to the low-dimensional chaotic systems, high-dimensional chaotic system with higher security, larger key space and more randomness. This study proposes a color image in wavelet domain is a new encryption algorithm based on Lorenz chaotic system, first wavelet image processing, the wavelet domain coefficients matrix based on the chaotic system disorder sequence repeatedly block scrambling;in order to improve the efficiency of scrambling, proliferation. and scrambling out of the way at the same time, thus can reduce the number of the traversal of the algorithm, improve the image encryption efficiency, and reduce the computation time of the encryption algorithm.Finally, the proposed algorithm simulation experiments. Compared with other algorithms, the derived data showed that the proposed algorithm has good effects and strong encryption key sensitivity, that are resistant to brute force and other interference with higher safety and practicality.