Keyspace sensitivity test is commpleted with a test utility

Author: codeShaurya

Image/encryption/encrypted_image.jpg

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+#include <bits/stdc++.h>
+#include <opencv2/opencv.hpp>
+
+using namespace cv;
+using namespace std;
+
+const int MAX=1e4+79;
+
+/**
+  u is the control parameter for logistic chaotic map,also known as population rate
+  Here u is taken 3.94
+  
+  x is the vector that contain the value generated by chaotic map
+  The initial value of the logistic chaotic map is 0.4
+*/
+
+int main()
+{
+  Mat image;
+  int i,l;
+  double u=3.94;         
+  vector<pair<double,int >> x;
+  Vec<unsigned char, 3>  pixel;
+
+  image = imread("Image/encryption/encrypted_image.jpg", 0 );
+  if ( !image.data )
+  {
+    cout<<"No image data \n";
+    return -1;
+  }
+
+  x.push_back({0.4,0});
+
+
+  double temp;
+  for (int i = 1; i <= 511; ++i){
+    temp=u*x[i-1].first*(1-x[i-1].first);
+    x.push_back({temp,i});
+  }
+
+  sort(x.begin(), x.end());
+
+  imshow("Decrypted image", image);
+  waitKey(0);
+
+  i=1;
+  for(int r = 0; r < image.rows; ++r) {
+    for(int c = 0; c < image.cols; ++c) {
+      if(i>100){
+        i=1;
+      }
+      l=x[i].first*MAX;
+      l=l%255;
+      image.at<Vec3b>(r,c)[0]=image.at<Vec3b>(r,c)[0]^l;
+      image.at<Vec3b>(r,c)[1]=image.at<Vec3b>(r,c)[1]^l;
+      image.at<Vec3b>(r,c)[2]=image.at<Vec3b>(r,c)[2]^l;
+      i++;
+    }
+  }
+
+  i=511;
+  for(int r = image.rows-1; r >= 0; --r) {
+    for(int c = image.cols-1; c >= 0 ; --c) {
+      if(i<0)
+        i=511;
+      int temps= x[i].second;
+
+      pixel= image.at<Vec3b>(r,temps);
+      image.at<Vec3b>(r,temps)=image.at<Vec3b>(r,c);
+      image.at<Vec3b>(r,c)=pixel;
+
+      i--;
+    }
+  }
+
+  namedWindow("Original_image", WINDOW_AUTOSIZE );
+  imshow("Original_image", image);
+  waitKey(0);
+
+  return 0;
+
+}