I'm trying to encrypt a bmp image with RC4 but the encrypted image is not much different from The original one att all
public static void main(String[] args) throws FileNotFoundException, IOException{
try{ File bmpFile = new File("C:\\Users\\acer\\Desktop\\py\\6.bmp"); BufferedImage image = ImageIO.read(bmpFile); int width = image.getWidth(); int height = image.getHeight(); int[][] pixels = new int[width][height]; for( int i = 0; i < width; i++ ) for( int j = 0; j < height; j++ ) pixels[i][j] = image.getRGB( i, j ); int []key ={100,70,600,878}; int []t =new int[256]; int []s =new int[256]; for(int i=0;i<s.length;i++) s[i]=i; for(int i=0;i<t.length;i++) t[i]=key[i%key.length]; int j=0; for(int i=0;i<s.length;i++){ j=(j+s[i]+t[i])%s.length; int temp=s[i]; s[i]=s[j]; s[j]=temp; } int tt; int k; j=0; int i=0; for(int c=0;c<width;c++){ for(int cc=0;cc<height;cc++){ i = (i + 1) % s.length; j = (j + s[i]) % s.length; int temp=s[i]; s[i]=s[j]; s[j]=temp; tt = (s[i] + s[j]) % 256; k = s[tt]; pixels [c][cc]=pixels[c][cc] ^ k; } } for( i = 0; i < width; i++ ) for( j = 0; j < height; j++ ) image.setRGB(i, j, pixels[i][j]); bmpFile = new File("C:\\Users\\acer\\Desktop\\py\\66.bmp"); ImageIO.write(image, "bmp", bmpFile); } catch (IOException e){ System.out.println(e.getMessage()); } } i dont know what the problem,i looked for some codes but didn't found a lot of differences
