New colour image encryption algorithm based on high-dimension chaotic system
Yuping Hu · Journal of Computer Applications · 2007
According to the characteristic of higher secrecy of high-dimension chaotic system,a new colour image encryption algorithm based on unified chaotic system and general cat maps was proposed.Firstly,tricolor scrambling transformation was realized respectively in space domain by using the general cat maps.Then the three chaotic sequences of unified chaotic system were adopted to realize the tricolor Substitution transformation pixel by pixel.The results demonstrate that the algorithm has good properties of confusion and diffusion.The key space is large enough to resist the brute-force attack.For the encrypted image the distribution of pixel-values has a random-like behavior and the values of adjacent pixels satisfy zero correlation,showing that the proposed scheme is of high security.