This program encrypts jpg and png images. It works by repositioning all image pixels. It supports passwords of up to 20 characters (a-z, A-Z, and 0-9) and can be made longer easily. The filename of the saved encrypted image is "result.png". Entering the correct password into the text field and pressing the "Decrypt" button will convert it back into its original form.
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230 | import java.awt.*;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.event.*;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
public class ImageEncryptor extends JFrame{
private BufferedImage bufimage=null;
private ImageIcon icon=null;
private JTextField tfield=null;
private JLabel label=null;
public ImageEncryptor(){
super("Image Encryptor");
setSize(800,600);
setLayout(new BorderLayout());
JButton bopen=new JButton("Open");
bopen.addActionListener(new ButtonHandler());
tfield=new JTextField(20);
JButton bencrypt=new JButton("Encrypt");
bencrypt.addActionListener(new ButtonHandler());
JButton bdecrypt=new JButton("Decrypt");
bdecrypt.addActionListener(new ButtonHandler());
JPanel p1=new JPanel();
p1.add(bopen);
p1.add(tfield);
p1.add(bencrypt);
p1.add(bdecrypt);
add(p1,BorderLayout.NORTH);
label=new JLabel();
JPanel p2=new JPanel();
p2.add(label);
add(p2,BorderLayout.CENTER);
JButton bsave=new JButton("Save");
bsave.addActionListener(new ButtonHandler());
JPanel p3=new JPanel();
p3.add(bsave);
add(p3,BorderLayout.SOUTH);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
show();
}
class ButtonHandler implements ActionListener{
public void actionPerformed(ActionEvent e){
if(e.getActionCommand()=="Open"){
FileDialog fd=new FileDialog(ImageEncryptor.this,"Open Image File",FileDialog.LOAD);
fd.setDirectory("C:\\");
fd.setVisible(true);
String filename=fd.getFile();
if (filename!= null){
try{
bufimage=ImageIO.read(new File(filename));
}catch(Exception ex){
}
icon=new ImageIcon(bufimage);
label.setIcon(icon);
}
}
if(e.getActionCommand()=="Encrypt"){
int width=bufimage.getWidth();
int height=bufimage.getHeight();
String passkey=tfield.getText();
if(passkey==null||passkey.length()>20){
return;
}
int passkeyint[]=new int[passkey.length()];
for(int i=0;i<passkey.length();i++){
if((passkey.charAt(i)>='0'&&passkey.charAt(i)<='9')||(passkey.charAt(i)>='a'&&passkey.charAt(i)<='z')||(passkey.charAt(i)>='A'&&passkey.charAt(i)<='Z')){
passkeyint[i]=Integer.valueOf(passkey.charAt(i));
}else{
return;
}
}
int counter=0;
int pixels[]=new int[width*height];
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
pixels[counter]=bufimage.getRGB(j,i);
counter++;
}
}
ArrayList<Integer> arrayList=new ArrayList<Integer>();
int pos=0;
counter=0;
for(int i=0;i<pixels.length;i++){
int temp=pos+passkeyint[counter];
if(i==temp){
int counter2=0;
for(int j=pos;j<(pos+passkeyint[counter]);j++){
arrayList.add(counter2,pixels[j]);
counter2++;
}
counter2=0;
Collections.reverse(arrayList);
for(int j=pos;j<(pos+passkeyint[counter]);j++){
pixels[j]=arrayList.get(counter2);
counter2++;
}
arrayList.clear();
pos=pos+passkeyint[counter];
if(pos>=(pixels.length))
break;
counter++;
if(counter==passkeyint.length){
counter=0;
}
}
}
counter=0;
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
bufimage.setRGB(j,i,pixels[counter]);
counter++;
}
}
icon=new ImageIcon(bufimage);
label.setIcon(icon);
}
if(e.getActionCommand()=="Decrypt"){
int width=bufimage.getWidth();
int height=bufimage.getHeight();
String passkey=tfield.getText();
if(passkey==null||passkey.length()>20){
return;
}
int passkeyint[]=new int[passkey.length()];
for(int i=0;i<passkey.length();i++){
if((passkey.charAt(i)>='0'&&passkey.charAt(i)<='9')||(passkey.charAt(i)>='a'&&passkey.charAt(i)<='z')||(passkey.charAt(i)>='A'&&passkey.charAt(i)<='Z')){
passkeyint[i]=Integer.valueOf(passkey.charAt(i));
}else{
return;
}
}
int counter=0;
int pixels[]=new int[width*height];
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
pixels[counter]=bufimage.getRGB(j,i);
counter++;
}
}
ArrayList<Integer> arrayList=new ArrayList<Integer>();
int pos=0;
counter=0;
int counter2=0;
for(int i=0;i<pixels.length;i++){
int temp=pos+passkeyint[counter];
if(i==temp){
counter2=0;
for(int j=pos;j<(pos+passkeyint[counter]);j++){
arrayList.add(counter2,pixels[j]);
counter2++;
}
counter2=0;
Collections.reverse(arrayList);
for(int j=pos;j<(pos+passkeyint[counter]);j++){
pixels[j]=arrayList.get(counter2);
counter2++;
}
arrayList.clear();
pos=pos+passkeyint[counter];
if(pos>=(pixels.length))
break;
counter++;
if(counter==passkeyint.length){
counter=0;
}
}
}
counter=0;
counter2=0;
for(int i=0;i<height;i++){
for(int j=0;j<width;j++){
bufimage.setRGB(j,i,pixels[counter]);
counter++;
if(counter2==passkeyint.length){
counter2=0;
}
}
}
icon=new ImageIcon(bufimage);
label.setIcon(icon);
}
if(e.getActionCommand()=="Save"){
try{
ImageIO.write(bufimage,"png",new File("result.png"));
}
catch(Exception ex){
}
}
}
}
public static void main(String[] args){
ImageEncryptor ap=new ImageEncryptor();
}
}
|
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