how to calculate the key space for 4d rossler system, i wanted to use x,y,z,w as key in image encryption technique, for that i have to calculate the key space.

x(1)=-10;y(1)=-6;z(1)=0;w(1)=10;

a= 0.2500;b= 3; c= 0.5000;d= 0.0500;dt= 0.0025;

%%---------4d rossler hyperchaotic system-----------

for i=1:1:3*3000000

x(i+1) = x(i) + dt*(-y(i)-z(i));

y(i+1) = y(i) + dt*(x(i) + (a*y(i)) +w(i));

z(i+1) = z(i) + dt*(b+x(i).*z(i));

w(i+1) = w(i) + dt*(-c.*z(i)+d.*w(i));

end

[KALYAN ACHARJYA]

There is no coding error, but the iterations number is too high? Is their any problem, can you elaborate more?

[juveria fatima]

there is no problem with iterations i just wanted to find the key space

in many paper hyperchaotic sequence has been used as a key in encryption process , i also want to use the same above 4d rossler for encrytion. the problem is i dont know how to calculate the key space