can anyone explain what does this code do? Thanks in advance

clc;
clear all;
close all;
imag1 = imread('peppers.png');
imag2=rgb2gray(imag1);
x= imresize(imag2, [64, 64]);
[n,m,k]=size(x);
b=8;
n=n*b*m;
bi = zeros(n,1,'uint8');
c = 0.3;
tic;
for i = 2 : n
    sum = 1 - 2* c * c;    
     if (sum<0.0)
        bi(i-1) = 1;
     end
     c =  sum;
end
key = zeros(n/b,1,'uint8');
for i1 = 1 : n/b
    for i2 = 1 : b
    key(i1) = key(i1) + bi(i2*i1)* 2^(i2-1);
    end
end;

[n, m, k] = size(x)

for ind = 1 : m    
    Fkey(:,ind) = key((1+(ind-1)*n) : (((ind-1)*n)+n));
end

for i3 = 1 : k
    x1= x(:,:,i3);
for i4 = 1 : n
    for i5=1:m  
        y(i4,i5) = bitxor(x1(i4,i5),Fkey(i4,i5));  
        end
    end
xout(:,:,i3) = y(:,:,1);
end;

[per isakson]

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Answer 1

[Walter Roberson]

What does the program documentation say about what it does and how it works? What did the author of the code say when you asked them what the program was for? What were you searching for when you found the code, or did you just ask Google to find yourself a random MATLAB program that you thought you might start learning MATLAB from?