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Commit c5bfa5b

Browse files
Keyspace sensitivity test is commpleted with a test utility
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‎Image/encryption/encrypted_image.jpg‎

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‎encryption/decryption.cpp‎

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

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