Lossless Color Image Encryption Algorithm Combining Discrete Cosine Transform and Discrete Wavelet Transform
In order to make the image transmission in the network safely,combined with the research of image encryption in the frequency do-main,a new color image encryption algorithm is proposed.Firstly,the plain-text image is divided into three primary color components,and the two-dimensional discrete cosine transform(DCT)is performed to obtain the DC and AC scrambling sequences.Nextly,perform two-di-mensional discrete wavelet transform(DWT)on the scrambling matrix to obtain four sub-bands matrices,then the binary matrix for diffusion is obtained by performing inverse two-dimensional wavelet transform on the scrambled sub-bands,convert the two-dimensional decimal ma-trix into a three-dimensional binary matrix,two binary matrices are converted into two-dimensional decimal matrix after XOR operation,and finally perform a diffusion operation to obtain a cipher-text image.The experimental results show that the designed algorithm can effectively re-sist plain-text attacks and unlawful attacks.
color image encryptiondiscrete cosine transformdiscrete wavelet transformthree-dimensional chaotic system
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