A New image encryption technology implementing a big random S-Box

摘要

This paper traces the implementation of a new chaos-based color image encryption system using three different substitution matrices as a profound improvement of Vigenère’s classical method. After vectorizing the clear image and computing an initialization value to modify the value of the first pixel and start the encryption process, each pixel is successively confused by the three S-boxes generated from the chaotic maps used, a chaining is established between the encrypted pixel and the next clear pixel, to increase the impact of the avalanche effect and to protect the system from known differential attacks. Simulations performed by our algorithm on a large database of images of different sizes and formats show that our approach is immune to known attacks.