An image encryption algorithm based on substitution technique and chaos mixing

These recent years, countless chaos-based image encryption algorithms have been proposed to meet security needs in real time multimedia communication. However, many of these have exhibited flaws due to the chaotic map inadequacy. In this paper, we proposed a fast and secure image encryption algorithm by using new 1D chaotic systems, with better chaotic properties in the range of their control parameters. These new chaotic systems were obtained from well-known 1D chaotic maps (Logistic, May, Gaussian, Gompertz) with flaws in their chaotic properties. From the chaotic systems designed, we extracted a pseudo random number sequence (PRNS) and generated S-boxes. Then a novel technique of plain image substitution was used to enhance the sensitivity of the original image pixels, followed by a scrambling-masking technique using the generated S-box. Security tests and evaluation metrics confirmed that the proposed cryptosystem was efficient, practicable, and reliable, with high potential to be adopted for network security and secure communications because of its high encryption speed.

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