int decrypter(int width, int clef) {
   // permet de décrypter l'image à l'aide de m
    int decry = 0;
   int m = 2;
   int i = 1;
   int I;
   while (m < width && decry == 0) {
      I = (i * clef * m) % width;
      if (I == 1) {
         decry = m;
         println(decry);
      }
      m ++;
   }
   return  decry;
}

void main() {
   String chemin = readString("URL de l'image ou chemin d'accès");
   int width;
   int height;
   int numLettre = 0;
   int i;
   int I;
   int k;
   int j;
   int J;
   String message;
   int Lettre[][][] = new int [50][50][27];
   int color[] = new int [3];

   //Charger l'alphabet que l'on utilisera

   for (char lettre = 'A'; lettre < 'Z'; lettre++) {
   	 load("C:/Users/Baptius/Desktop/ISN/"+lettre+".png", false, false);
      height = getHeight();
      width = getWidth();
      for (i = 0; i < width; i ++) {
         for (j = 0; j < height; j ++) {
            Lettre[i][j][numLettre] = getPixel(i, j);
            if(Lettre[i][j][numLettre]>200){
            	Lettre[i][j][numLettre] = 1;
            }else{
            	Lettre[i][j][numLettre] = 0;
            }
         }
      }
      numLettre++;
   }
   //Mettre l'image dans un tableau
   load("C:/Users/Baptius/Pictures/STATCSGO.PNG", false, false);
   height = getHeight();
   width = getWidth();
   int pixelColor[][][] = new int[width][height][3];
   for (k = 0; k < 3; k ++) {
      for (i = 0; i < width; i ++) {
         for (j = 0; j < height; j ++) {
            color = getPixelColor(i, j);
            pixelColor[i][j][k] = color[k];
         }
      }
   }
   //Mélanger l'image
    reset(width, height, false, false);
   for (i = 0; i < width; i ++) {
      for (j = 0; j < height; j ++) {
         I = 2153 * i % width;
         J = 2153 * j % height;
         setPixel(I, J, pixelColor[i][j][0], pixelColor[i][j][1], pixelColor[i][j][2]);
      }
   }
   //Écrire un texte
    message = readString("Inserez le message à cacher après quoi vous cliquerez sur l'image pour le placer");
   sleep(2500);
   setRunnable(new Runnable() {
      public void run() {
         println("getX() =" + getX() + "getY() = " + getY());}
   }
  );
   //Mettre l'image dans un tableau
    for (k = 0; k < 3; k ++) {
      for (i = 0; i < width; i ++) {
         for (j = 0; j < height; j ++) {
            color = getPixelColor(i, j);
            pixelColor[i][j][k] = color[k];
         }
      }
   }
   sleep(5000);
   //Réassembler L'image
    int decrypx = decrypter(width, 2153);
   int decrypy = decrypter(height, 2153);
   reset(width, height, false, false);
   for (i = 0; i < width; i ++) {
      for (j = 0; j < height; j ++) {
         I = decrypx * i % width;
         J = decrypy * j % height;
         setPixel(I, J, pixelColor[i][j][0], pixelColor[i][j][1], pixelColor[i][j][2]);
      }
   }
}