How to Perform DES Encryption and Decryption of TXT file in JAVA with NetBeansIDE

1. Open NetBeansIDE.

2. Make a JFrame Form say EncryptTXT.java , I have already made it.

             

3. Make a class named DESEncrypt.java enter codes and Fix All Imports(It is necessary)

    3.1 Write code in it

          public static void encrypt(String key, InputStream is, OutputStream os) throws Exception {

                                encryptOrDecrypt(key, Cipher.ENCRYPT_MODE, is, os);

                }

                public static void decrypt(String key, InputStream is, OutputStream os) throws Exception {

                                encryptOrDecrypt(key, Cipher.DECRYPT_MODE, is, os);

                }

                public static void encryptOrDecrypt(String key, int mode, InputStream is, OutputStream os) throws Exception {

                                DESKeySpec dks = new DESKeySpec(key.getBytes());

                                SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");

                                SecretKey desKey = skf.generateSecret(dks);

                                Cipher cipher = Cipher.getInstance("DES");

                                if (mode == Cipher.ENCRYPT_MODE) {

                                                cipher.init(Cipher.ENCRYPT_MODE, desKey);

                                                CipherInputStream cis = new CipherInputStream(is, cipher);

                                                makeFile(cis, os);

                                } else if (mode == Cipher.DECRYPT_MODE) {

                                                cipher.init(Cipher.DECRYPT_MODE, desKey);

                                                CipherOutputStream cos = new CipherOutputStream(os, cipher);

                                                makeFile(is, cos);

                                }

                }

                public static void makeFile(InputStream is, OutputStream os) throws IOException {

                                byte[] bytes = new byte[64];

                                int numBytes;

                                while ((numBytes = is.read(bytes)) != -1) {

                                                os.write(bytes, 0, numBytes);

                                }

                                os.flush();

                                os.close();

                                is.close();

                }

4. Right Click on ‘EncryptTXT.java’ form’s Encrypt button and Go to Events~action~actionPerformed

  4.1 Paste the following code for Encrypt Button actionPerformed.

        try{

        JFileChooser fc=new JFileChooser();

        fc.showOpenDialog(null);

        String path=fc.getSelectedFile().getAbsolutePath();

        jLabel2.setText(path);

        File f=fc.getSelectedFile();

        FileInputStream fis=new FileInputStream(f);

        FileOutputStream fos=new FileOutputStream("encrypted.txt");

        Thread.sleep(2000);

       

        DESEncrypt.encrypt(key, fis, fos);

       

        jLabel4.setText("C:\\Users\\raks\\Documents\\NetBeansProjects\\DESEncryption\\encrypted.txt");

        }catch(Exception e)

        {

            System.out.print("Exception in EncryptTXT");

        }

4.2 Paste the following code for Decrypt Button actionPerformed.

        try{

        JFileChooser fc=new JFileChooser();

        fc.setCurrentDirectory(new File("C:\\Users\\raks\\Documents\\NetBeansProjects\\DESEncryption"));

        fc.showOpenDialog(null);

        String path=fc.getSelectedFile().getAbsolutePath();

        jLabel2.setText(path);

        File f=fc.getSelectedFile();

        FileInputStream fis=new FileInputStream(f);

        FileOutputStream fos=new FileOutputStream("decrypted.txt");

        DESEncrypt.decrypt(key, fis, fos);

        Thread.sleep(2000);

        jLabel4.setText("C:\\Users\\raks\\Documents\\NetBeansProjects\\DESEncryption\\decrypted.txt");

        }catch(Exception e)

        {

            System.out.print("Exception in EncryptTXT");

        }

4.3 Paste the following code for Opening Encrypted File Folder button actionPerformed.

        Runtime runtime=Runtime.getRuntime();

        try {

            runtime.exec("explorer.exe C:\\Users\\raks\\Documents\\NetBeansProjects\\DESEncryption");

        } catch (IOException ex) {

            Logger.getLogger(EncryptTXT.class.getName()).log(Level.SEVERE, null, ex);     

       }

5. Run the project with EncryptTXT.java file.

6. Finish

Thank You :)

Encryption in this Project :

Decryption in this Project :

Download Whole Project for NetBeansIDE