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Image encryption using Camellia and Chaotic maps

Multimedia information security has a vital role in communication systems. One of the security aspects is the encryption. A new image encryption approach, that uses the Camellia block cipher algorithm combined with the logistic chaotic map, is proposed in this paper. CAT map is used to scramble the image and the S-function output is masked for more security. Key schedule algorithm is used to generate the pre-whitening key and the round key while logistic map is used to generate the round mask and the post-whitening key. The experimental results show that the suggested approach is highly resistive to statistical attacks and sensitive to slight changes in the key. It has large key space and short encryption time. The proposed approach was tested for both gray scale and colored images.