Transposition Cipher
Hi All,
I've just made my own program which is Encrypting the plaintexts using Transposition Techniques, but I dont know how to decrypt it! here is my code code
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
publicclass Transposisi{
publicstaticvoid main (String[]args){
new MenuGUI();
}
}
class MenuGUIextends JFrameimplements ActionListener{
JTextArea io =new JTextArea();
JButton btnEncry =new JButton("Encrypts");
JButton btnExit =new JButton("Exit");
JButton btnDecry =new JButton("Decrypt");
//JButton btnClear = new JButton("Clear");
MenuGUI(){
super("Teknik Subsitusi : Transposisi");
getContentPane().setLayout(new BorderLayout());
setSize(350,300);
setLocation(200,250);
io.setLineWrap(true);
io.setWrapStyleWord(true);
JScrollPane jsp =new JScrollPane(io);
btnEncry.addActionListener(this);
btnEncry.setActionCommand("Encry");
btnExit.addActionListener(this);
btnExit.setActionCommand("Exit");
btnDecry.addActionListener(this);
btnDecry.setActionCommand("Decrypt");
/*btnClear.addActionListener(this);
btnDecry.setActionCommand("Clear");*/
JPanel pnlBawah =new JPanel();
pnlBawah.setLayout(new FlowLayout());
pnlBawah.add(btnEncry);
pnlBawah.add(btnDecry);
//pnlBawah.add(btnClear);
pnlBawah.add(btnExit);
getContentPane().add(jsp,BorderLayout.CENTER);
getContentPane().add(pnlBawah, BorderLayout.SOUTH);
setVisible(true);
}
publicvoid actionPerformed(ActionEvent e){
if(e.getActionCommand().equalsIgnoreCase("Encry")==true){
String plainTeks = io.getText();
String cipherTeks="";
double panjang = plainTeks.length();
int ukuran_matrik = (int)Math.ceil(Math.sqrt(panjang));
char[][]data =newchar[ukuran_matrik+1][ukuran_matrik+1];
int k = 0;
selesai:
for(int i = 1;i<data.length;i++){
for(int j = 1;j<data[i].length;j++){
if(k>=(int)panjang){
break selesai;
}
data[i][j]=plainTeks.charAt(k);
k=k+1;
}
}
String kunci = JOptionPane.showInputDialog(this,"Key("+ ukuran_matrik +")","Transposition",JOptionPane.QUESTION_MESSAGE);
for(int j = 0;j<kunci.length();j++){
int kunci_pisah = Integer.parseInt(kunci.substring(j,j+1));
for (int i = 1; i><data.length;i++)
{
if((int)data[i][kunci_pisah]==0){
continue;
}
cipherTeks +=data[i][kunci_pisah];
}
}
io.setText(cipherTeks);
}
else{
this.dispose();
System.exit(0);
}
}
}
thanx anyway!>
