title: Simple encryption in java-no key/password
body: <p>Say I have an IP address, 192.168.1.1</p>
  <p>I want my program to create a random one-word string based on this IP address which can be easily decrypted without a key or password or additional security.</p>
  <p>eg.</p>
  <blockquote>
  <p>I enter 192.168.1.1</p>
  <p>Program converts it to AzlQrEHCSD or some other random string</p>
  <p>I enter this string in the program</p>
  <p>It gets converted back to 192.168.1.1</p>
  </blockquote>
  <p>Is there any simple algorithm that can do this without generating stuff like keys or additional passwords? I understand that keys and passwords are <strong>a must</strong> for encryption and decryption, but my scenario does not require it.</p>