Simple encryption... need help...

Question

hello friends,
this may be a simple problem, but, as i m new plz forgive me...
i have to accept three command line agrumetns like...
name ---> string
age ---> integer
date ---> string
now, i want to encrypt these data in a two different text files with two different encryption methods...
and later i need to decrypt the data from both the textfiles...
can anyone help me how can i achieve this task ???
Thanks,
Rohan

Answer 1

hi arshad,
thanks for the guidence...
i just needed the proper direction... not the code...
Thanks again...
i went through some books and tried a sample code from a book...
here is the code...
package des;
import java.io.*;
import java.security.*;
import javax.crypto.*;
import sun.misc.*;
* @author Rohan.Nakar
public class SecretWriting
     public static void main(String[] args) throws Exception
          //checking argumetns
          if(args.length < 2)
               System.out.println("Usage: SecureWriting -e | -d plainText");
               return;
          //get or create key
          Key key;
          try
               ObjectInputStream in = new ObjectInputStream( new FileInputStream("SecretKey.ser"));
               key = (Key)in.readObject();
               in.close();
          catch (FileNotFoundException fnfe)
               KeyGenerator generator = KeyGenerator.getInstance("DES");
               generator.init(new SecureRandom());
               key = generator.generateKey();
               ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream("SecretKey.ser"));
               out.writeObject(key);
               out.close();
          //get a cipher object
          Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
          //Encrypt or decrypt the input string
          if (args[0].indexOf("e") != -1)
               cipher.init(Cipher.ENCRYPT_MODE, key);
               String amalgam = args[1];
               for(int i = 2; i < args.length; i++)
                    amalgam += " " + args;
               byte[] stringBytes = amalgam.getBytes("UTF8");
               byte[] raw = cipher.doFinal(stringBytes);
               BASE64Encoder encoder = new BASE64Encoder();
               String base64 = encoder.encode(raw);
               System.out.println(base64);
          else if (args[0].indexOf("d") != -1)
               cipher.init(Cipher.DECRYPT_MODE, key);
               BASE64Decoder decoder = new BASE64Decoder();
               byte[] raw = decoder.decodeBuffer(args[1]);
               byte[] stringBytes = cipher.doFinal(raw);
               String result = new String(stringBytes, "UTF8");
               System.out.println(result);
this is giving me an exception...
java.security.NoSuchAlgorithmException: Algorithm DES not available
     at javax.crypto.SunJCE_b.a(DashoA6275)
     at javax.crypto.KeyGenerator.getInstance(DashoA6275)
     at des.SecretWriting.main(SecretWriting.java:40)
Exception in thread "main"
any help...
Thanks in advance...