title: decrypt a cipher -- RoR
body: <p>In my Rails App, I have a client 'C1' who will send me the username of C1's clients. I and C1 share a salt. C1 will send me the username encrypted with the help of the shared salt. Now I need to decrypt it and get the original username and store it in my dB. How can I do it?</p>
  
  <p>Please help. Thanks in Advance.</p>