A colour byte scrambling technique for efficient image encryption based on combined chaotic map: Image encryption using combined chaotic map

In this paper, an image encryption scheme based on colour byte scrambling technique is proposed by using Logistic map and Ikeda map. The proposed scheme is using Logistic map for generating permutation sequence to shuffle the colour bytes (confusion) and Ikeda map is used for generating masking sequence to change the value of the colour bytes (diffusion) of the 24-bit colour image. The traditional scrambling techniques confusion and diffusion are applied continuously on the test image which leads to producing the cipher image which has good confusion and diffusion properties. Since we are applying Logistic map and Ikeda map for image encryption, it is very difficult for the cryptanalyst to break the proposed image encryption algorithm.