logistic.m

function [out]=logistic(x,y,siz)

% key generation using Chaotic map function (Logistic map)
% Note: If you are using my code for your system or project, you should always cite my paper as a reference. 
% K C.Jithin, SyamSankar, "Colour image encryption algorithm combining Arnold map, DNA sequence operation, and a Mandelbrot set", Journal of Information Security and Applications, Elsevier, Volume 50, February 2020, DOI: https://doi.org/10.1016/j.jisa.2019.102428



%STEP1 : Creating an empty martrix for keys

  k = double(zeros(siz,siz));
  
%STEP 2: Reading initial & parameter values

    
%STEP 3: Initialize number of iteration for the map

  disp('Created by Jithin K C');
  
  r= 1 ; % Number of iteration
  for j=1:r
  for i = 1:siz*siz
      d(i)=(y*x)*(1-x);
      x=d(i);
  end
  end

     k=d;
     out= reshape(k,[siz,siz]);
end