Abstract:The Logistic chaotic sequence is famous for its randomness, the sensitive of the original value and non-repeatability of iteration. This paper presents a multiple image encryption technology based on scrambling the pixel value of original image and the position of wavelet coefficients. Firstly, we modify the pixel value of original image by using the chaotic sequences based on logistic mapping. Secondly, the pixel value is further to be scrambled by using diffusion transformation. At last, in order to encrypt the image again, we use wavelet analysis to improve the performance of encryption. In this paper, we change the location of wavelet coefficients using another logistic chaotic sequence. An encrypted image is obtained by reconstructing the scrambled wavelet coefficients. The test results show the algorithm disturbs the histogram distribution of original image which enables the encrypted image can resist the statistics attack of known-plaintext. And the algorithm can realize the image encryption with larger key space and good effect.