Please help: Encrypt Password
Very small query which has confused me a lot.....
I have to encrypt passwords and save them in to database, I am not getting where to start as I do not know anything about java encryption packages or other things.
Please let me know where can I find the names of all the algorithms and it will be very nice if u can tell me that which one should I use.
thanx
Hi,
MD5 and SHA-x Algorithms do not encrypt, these are so called hash algorithms which means they create a (hopefully) unique, fixed length byte array from what you give as input. Usually that is a way to store Passwords because you never need to decrypt a password (in the case of hash algorithms you are not able to do so anyway). If a user signs in, you hash his password and compare that created hash with the stored hash value. If they are equal, you can be sure enough (1:2^100 or something as chance that two different passwords create the same hash code) that the user knew his password. I know a lot of eBusiness plattforms that store passwords as MD5 or SHA-1 hash values. I think they can be seen as secure enough for such purposes.
Another story if you need the password in cleartext (maybe to start a batch process) but you don't want to store it as clear text. Then you have to encrypt the password and decrypt it when needed. But then you run into the problem where to store the encryption key so that nobody can decrypt your password with that.
The public key encryption is only usefull if you need to create a so called secret between two parties via an unsecure communication media. Like the HTTPS protocol does. The browser and the web server are exchanging public information (public keys) and then they are able to communicate secure without the need to share sensitive information in advance. But that is definitely not needed for your scenario.
The HMAC is another completely different story. It just says that you "can" use the MAC address of your Network adapter for the hash algorithm, but you don't need to do so. Since it is hard to read the MAC address from java I would not suggest to go in that direction.
I that now light enough? ;-)
Stephan
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[ http://java.ittoolbox.com/documents/document.asp?i=1676 ]
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* Constructor for the PasswordEncrypt object
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Hello I am trying to create a one way hash password encryption...here is what I have developed so far.....
Login class (contains GUI)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.awt.image.*;
import javax.imageio.*;
public class Login implements ActionListener
// declare class variables and objects
// overall frame
private FrameBase jf;
// buttons
private JButton btnNewUser,btnLogin;
// data display labels
private JLabel lblMessage, lblUser, lblPassword, lblTitle, lblCheck,lblNotes;
// text fields for data entry
private JTextField txtUser, txtPassword,txtCheck;
// graphic object
private BufferedImage eSay;
// panels for organization
private JPanel pnlTitle, pnlMain, pnlGraphic;
// font objects
private Font fntTitle, fntMain, fntControl,fntNotes;
// user name for repeated set screen calls
private String name;
// store screen layout option code
private int option;
// option 1 - regular start-up
// option 2 - new user screen
// option 3 - user / password check
public Login(String name)
// set up the fonts
fntTitle=new Font("Helvetica", Font.BOLD, 25);
fntMain=new Font("Helvetica", Font.BOLD, 20);
fntControl=new Font("Helvetica", Font.BOLD, 15);
fntNotes=new Font("Helvetica", Font.BOLD, 16);
// set the BufferedImage object to null;
eSay=null;
try
// load the image from disk into a BufferedImage object
eSay=ImageIO.read(new File("h:\\My documents\\ICS4M1\\Login\\eSay.jpg"));
// set up the screen
this.name=name;
this.option=1;
setScreen(name);
catch (IOException e)
// message if file not found
System.out.println("Image not found");
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jf= new FrameBase(name);
// set up the screen
Container contentPane=jf.getContentPane();
contentPane.setLayout(new BorderLayout());
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pnlGraphic.setLayout(new BorderLayout());
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lblTitle.setFont(fntTitle);
lblMessage=new JLabel("Enter user name and password and click on Login or click on New User to set up a new account",0);
lblMessage.setFont(fntControl);
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pnlTitle=new JPanel();
pnlTitle.setLayout(new GridLayout(2,1));
pnlTitle.add(lblTitle);
pnlTitle.add(lblMessage);
// set up the input section of the screen
lblUser=new JLabel("User: ");
lblUser.setFont(fntMain);
lblPassword=new JLabel("Password: ");
lblPassword.setFont(fntMain);
lblCheck=new JLabel("Re-Type Password: ");
lblCheck.setFont(fntMain);
lblCheck.setEnabled(false);
lblNotes=new JLabel("<html><font color=\"red\">User name 6 to 10 alphanumeric characters, password 5 to 8 alphanumeric characters, </font></html>",0);
lblNotes.setFont(fntNotes);
txtUser=new JTextField(20);
txtUser.setFont(fntMain);
txtPassword=new JTextField(20);
txtPassword.setFont(fntMain);
txtCheck=new JTextField(20);
txtCheck.setFont(fntMain);
txtCheck.setEnabled(false);
btnLogin=new JButton("Login");
btnLogin.setFont(fntMain);
btnNewUser=new JButton("New User");
btnNewUser.setFont(fntMain);
// make the button active
btnLogin.addActionListener(this);
btnNewUser.addActionListener(this);
// assemble the input section panel
pnlMain=new JPanel();
pnlMain.setLayout(new GridLayout(5,2));
pnlMain.add(lblUser);
pnlMain.add(txtUser);
pnlMain.add(lblPassword);
pnlMain.add(txtPassword);
pnlMain.add(btnNewUser);
pnlMain.add(btnLogin);
pnlMain.add(lblCheck);
pnlMain.add(txtCheck);
// add the panels to the screen
contentPane.add(pnlTitle,"North");
contentPane.add(pnlGraphic,"Center");
contentPane.add(pnlMain,"East");
contentPane.add(lblNotes,"South");
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jf.setSize(900,400);
jf.show();
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public void actionPerformed(ActionEvent e)
if (e.getSource()==btnNewUser)
if (option==1)
lblCheck.setEnabled(true);
txtCheck.setEnabled(true);
lblMessage.setText("Create a login name and password, enter the password twice as indicated");
btnLogin.setEnabled(false);
option=2;
else if (option==2)
String tempUser=txtUser.getText();
String tempPassword=txtPassword.getText();
String tempCheck=txtCheck.getText();
if (tempPassword.equals(tempCheck))
ValidateUser vu=new ValidateUser(tempUser,tempPassword);
if (vu.getEncryptedPassword()==null)
lblMessage.setText("Please check guidelines for user name and password and re-enter");
else
lblMessage.setText("Login created - Welcome to eSay!");
else
lblMessage.setText("Passwords do not match, please re-enter login and password twice");
else if (e.getSource()==btnLogin)
} // actionPerformed
public static void main(String args[])
Login l=new Login("eSay Message Board");
} // end class Login User class
public class User
private String userName;
private String password;
private int numberLogins;
public User(String userName, String password)
this.userName=userName;
this.password=password;
this.numberLogins=0;
// gets for surname, first name and number of logins
public String getUserName()
return userName;
public int getNumberLogins()
return numberLogins;
public void resetLogins()
this.numberLogins=0;
public void login()
this.numberLogins++;
public static void main(String args [])
// enter test statements here
} // end of User classValidate User(validation)
System.out.println ("A character is invalid");
return false;
return true;
// create an encrypted password if user name and password are valid
public void encryptPassword()
// standard get for encrypted password
public String getEncryptedPassword()
return encryptedPassword;
}PasswordService(One way hash conversion)
package org.myorg.services;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import org.myorg.SystemUnavailableException;
import sun.misc.BASE64Encoder;
import sun.misc.CharacterEncoder;
public final class PasswordService
private static PasswordService instance;
private PasswordService()
public synchronized String encrypt(String plaintext) throws SystemUnavailableException
MessageDigest md = null;
try
md = MessageDigest.getInstance("SHA");
catch(NoSuchAlgorithmException e)
throw new SystemUnavailableException(e.getMessage());
try
md.update(plaintext.getBytes("UTF-8"));
catch(UnsupportedEncodingException e)
throw new SystemUnavailableException(e.getMessage());
byte raw[] = md.digest();
String hash = (new BASE64Encoder()).encode(raw);
return hash;
public static synchronized PasswordService getInstance()
if(instance == null)
return new PasswordService();
else
return instance;
}I was wondering if someone could help me to incorporate some kind of one way hash into the encryptPassword method in Validate user...i am having problems trying to call on the PasswordService and incorporating everything. The reason i supplied all the code was so that the reader could understand how different programs correlate with one another
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Report execution without prompting user id
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