Research on Image Encryption Based on Wavelet Transform Integrating with 2D Logistic

In order to protect them from theft, it is necessary to encrypt image data. When considering the security algorithm of image information security, we must consider its particularity. Two-dimensional Logistic chaotic mapping is introduced in the design of pixel gray value substitution, and two substitution ideas are adopted. That is to say, the low-frequency coefficient matrix after wavelet decomposition is scrambled first, and the image after wavelet transform is replaced by the pixel value. The encryption system constructed by the chaotic dynamic model can still solve the information better after the multimedia information is processed by some signals. The combination of the lifting wavelet transform in the frequency domain and the chaotic sequence in the spatial domain is used for image encryption, which has good encryption effect and practical prospect.