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* Project Name:   polyalphabetic cipher java code- encryption and decryption
* Programmer:   msi_333
* Type:   Encryption Algorithms
* Technology:  Java
* IDE:   NetBeans
* Description:   Polyalphabetic cipher
java code
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.DocumentFilter;


public class PolyTransMain{

/** Creates a new instance of DesMain */
public PolyTransMain() {
}

public static void main(String [] rr){
DesPanel mm = new DesPanel();
mm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
mm.setVisible(true);
}
}
class DesPanel extends JFrame{
public DesPanel(){
this.setTitle("PolyTrans");
this.setSize(800,800);
this.setVisible(true);

GenerateGUI();
}
PolyTrans p;
public static JTextArea StepsText = new JTextArea(10,40);


private Container c=this.getContentPane();
private JButton btnCihper = new JButton("Cipher");
private JButton btnDeCihper = new JButton("Decipher");

private JTextArea CipherText = new JTextArea(4,40);
private JTextArea OriginalText = new JTextArea(4,40);
private JTextArea DeCipherText = new JTextArea(4,40);


private JScrollPane OriginalScorl=new JScrollPane(OriginalText,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
private JScrollPane CipherScorl=new JScrollPane(CipherText,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
private JScrollPane DecipherScorl=new JScrollPane(DeCipherText,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
private JScrollPane StepScorl=new JScrollPane(StepsText,
JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
private JTextField KeyWord = new JTextField(16);
private JTextField KeyWordTwo = new JTextField(16);
private JPanel PanelCipher = new JPanel();
private JPanel PanelDecipher = new JPanel();
private JPanel PanelKeyWord = new JPanel();

private JPanel PanelOriginaltxt = new JPanel();
private JPanel jpstep=new JPanel();

private JLabel lblKeyWord= new JLabel("KeyWord : ");


private void GenerateGUI(){
c.setLayout(new GridLayout(4,1));

c.setLayout(new FlowLayout());

PanelKeyWord.setLayout(new FlowLayout());
PanelKeyWord.add(lblKeyWord);
PanelKeyWord.add(KeyWord);


PanelOriginaltxt.setBorder(BorderFactory.createTitledBorder("Original Text"));
PanelOriginaltxt.setLayout(new FlowLayout());
PanelOriginaltxt.add(OriginalScorl);

PanelCipher.setBorder(BorderFactory.createTitledBorder("Cipher Text"));
PanelCipher.setLayout(new FlowLayout());
PanelCipher.add(CipherScorl);
PanelCipher.add(btnCihper);

PanelDecipher.setBorder(BorderFactory.createTitledBorder("Decipher Text"));
PanelDecipher.setLayout(new FlowLayout());
PanelDecipher.add(DecipherScorl);
PanelDecipher.add(btnDeCihper);
jpstep.setBorder(BorderFactory.createTitledBorder("Mointor"));
jpstep.setLayout(new FlowLayout());
jpstep.add(StepScorl);


c.add(PanelKeyWord);

c.add(PanelOriginaltxt);
c.add(PanelCipher);
c.add(PanelDecipher);
c.add(jpstep);

DoActions();


}
private void DoActions(){
ActionHandler action = new ActionHandler();

btnCihper.addActionListener(action);
btnDeCihper.addActionListener(action);

}

private class ActionHandler implements ActionListener{


public void actionPerformed(ActionEvent e) {
if(e.getSource()==btnCihper){
String plaintext=OriginalText.getText();
String keyworD=KeyWord.getText();
StepsText.append("keyword : "+keyworD+'\n');
StepsText.append("PlainText : "+plaintext+'\n');
p= new PolyTrans(keyworD,plaintext);
p.Encrypt();
p.FillCharacMatrix();


CipherText.append(p.getCipher());

}
if(e.getSource()==btnDeCihper){
p.Decrypt();


DeCipherText.append("\n"+p.getDeCipher());
}
}

}
private String fina;

}

class DocumentSizeFilter extends DocumentFilter {
int maxCharacters;

public DocumentSizeFilter(int maxChars) {
maxCharacters = maxChars;
}

public void insertString(FilterBypass fb, int offs, String str, AttributeSet a)

throws BadLocationException {

if ((fb.getDocument().getLength() + str.length()) <= maxCharacters)
super.insertString(fb, offs, str, a);
else
Toolkit.getDefaultToolkit().beep();
}

public void replace(FilterBypass fb, int offs, int length, String str, AttributeSet a)

throws BadLocationException {

if ((fb.getDocument().getLength() + str.length()- length) <= maxCharacters)
super.replace(fb, offs, length, str, a);
else
Toolkit.getDefaultToolkit().beep();
}

}


java code
import java.util.Scanner;

public class PolyTrans {

/** Creates a new instance of PolyTrans */
public PolyTrans(String key, String plain) {
keyword=key;
PlainText=plain;
}

public void UserEntery() {






Encrypt();
FillCharacMatrix();
Decrypt();

}

public String getCipher(){
return cyphir;
}


public String getDeCipher(){
return dcyphir;
}


public void FillCharacMatrix(){

for(int i=0; i<=25; i++){
for(int j=0; j<=25; j++){
CharMatrix[i][j]=characters[(j+i)%26];
}
}

for(int i=0;i<=25;i++) {

System.out.print(" | ");
for(int j=0;j<=25;j++) {


System.out.print(" "+CharMatrix[i][j]+" ");
}
System.out.println(" | ");

}
}

public void Encrypt() {
int sub1=0,sub2=0,sub3=0;
int sub=0;
char char_num;
int start=0;
for(int i=0; i<PlainText.length(); i++) {
sub1=PlainText.substring(i,i+1).codePointAt(0);
sub2=keyword.substring(start,start+1).codePointAt(0);
start++;
sub3=sub1+sub2;
sub3=sub3%97;
sub=sub3%26;

if(cyphir==null)
cyphir=""+characters[sub];
else
cyphir+=characters[sub];



if(start==keyword.length()){
start=0;
}


}
System.out.println("The Cipher Text is: "+ cyphir);
}
public void Decrypt(){
int sub1=0,sub2=0,sub3=0;
int keyword_len;
int sub=0;
int cyphir_len;
char char_num;
int start=0;
for(int i=0; i<PlainText.length(); i++) {
sub1=cyphir.substring(i,i+1).codePointAt(0);
sub2=keyword.substring(start,start+1).codePointAt(0);

start++;

sub1=(sub1%97)%26;
sub2=(sub2%97)%26;


for(int k=0; k<26; k++) {
sub3=(Integer.parseInt(""+(short)CharMatrix[sub2][k])%97)%26;

if(sub1==sub3){

if(dcyphir==null)
dcyphir=Character.toString(CharMatrix[0][k]);
else
dcyphir+=Character.toString(CharMatrix[0][k]);
}
}






if(start==keyword.length()){
start=0;
}


}
System.out.println("The Dciphir Text is: "+ dcyphir);

}


private int Len=0;
private String keyword;
private String PlainText;
private String cyphir;
private String [][] charmatriex;
private String matrixv;
private char [][] CharMatrix=new char[26][26];
private char characters[]= {'a','b','c','d','e','f','g','h',
'i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
private String dcyphir;

}




Attachment:
File comment: polytrans
PolyTrans.gif
PolyTrans.gif [ 24.06 KiB | Viewed 14021 times ]


Attachment:
File comment: PolyTrans
PolyTrans.rar [21.76 KiB]
Downloaded 1804 times




_________________
M. S. Rakha, Ph.D.
Queen's University
Canada


Author:
Mastermind
User avatar Posts: 2715
Have thanks: 74 time

updated


_________________
M. S. Rakha, Ph.D.
Queen's University
Canada


Author:
Mastermind
User avatar Posts: 2715
Have thanks: 74 time
Post new topic Reply to topic  [ 2 posts ] 

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