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Image Encryption Algorithm Based on Compound Chaotic Sequence and Wavelet Transform
Jingwen Gu
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Abstract
An image encryption algorithm based on compound chaotic sequence and wavelet transform is proposed for the possible degradation of single chaotic map sequence and the high computing work of scrambling encryption of image.The algorithm combines Logistic mapping with Chebychev mapping which are both controlled by a random initial parameter generated by m-sequence to substitute encryption the image,then decomposes the image with wavelet transform,and in the end scrambles the approximation wavelet coefficient.The experiment result shows that the algorithm improves the degradation problem of single chaotic sequence with better randomness and improves the histogram distribution of the image.The algorithm has good encryption result to digital image data.