Abstract: This article sums up the image of the encryption algorithm and produce.24-Bitmap image encryption is implemented
in DWT domain，the data sequences used for encryption are created from Lorenz chaotic system.The article performs a
detailed comparison of the effect scrambling DWT coefficients at different scales for encryption，as well as the systematic analysis of the experimental result，finally points out a question using of wavelet coefficients for encryption，and also provides another method for the image encryption.