It depends on what your requirements are. Do you really need to be able to decrypt the password?

Often it is only necessary to one-way "encrypt" (or hash) the password. Then, you compare the hashes. That is the approach suggested above.

If you want reversible encryption, you have to use something like 3DES, etc.

-chris

this is the sample program which i have used

import java.security.*;
import java.sql.*;
import java.net.*;

public class CreateParticipant {


public static void main (String [] args ){

MessageDigest md = null;

try{

md = MessageDigest.getInstance("MD5");

}catch(Exception e){}

String strLoginName = args[0];
String strPassword = args[1];
String strEncryptedPassword ="";
String strEncryptedPassword_computed ="";
String strURLEncodedEncryptedPassword ="";

byte [] abytPassword = null;
byte [] abytEncrptedPassword = null;

abytPassword = strPassword.getBytes();
abytEncrptedPassword = md.digest(abytPassword);
strEncryptedPassword_computed = new String(abytEncrptedPassword);
strURLEncodedEncryptedPassword = URLEncoder.encode(strEncryptedPassword_computed);

System.out.println("Password --" +strPassword);
System.out.println("Encrypted Password --" +strEncryptedPassword_computed);
System.out.println("Encrypted Password Length --" +strEncryptedPassword.length());
System.out.println("URL encoded Encrypted Password computed --" +strURLEncodedEncryptedPassword);


createParticipant(strLoginName , strURLEncodedEncryptedPassword);


}

public static void createParticipant(String strLoginName ,String strURLEncodedEncryptedPassword){

try {

String strDriver = "org.postgresql.Driver";

Class.forName(strDriver);
String strURL = "jdbc:postgresql://172.16.100.4:5432/general_user";
Connection conn = DriverManager.getConnection(strURL, "postgres" , "postgres");

StringBuffer stbQuery = new StringBuffer();

stbQuery.append("insert into participant ( login_name , password )values (? ,?)");
String strQuery = stbQuery.toString();

PreparedStatement pstmt = conn.prepareStatement(strQuery);
pstmt.setString(1,strLoginName.replaceAll("'","''"));
pstmt.setString(2,strURLEncodedEncryptedPassword);


System.out.println(strQuery);

pstmt.executeUpdate();

}catch (Exception e){System.out.println(e);}



}
}