You can take a look at this : http://www.rubyfleebie.com/encryption-with-alphanumeric-output/ http://www.rubyfleebie.com/encryption-with-alphanumeric-outp... I

You can take a look at this : http://www.rubyfleebie.com/encryption-with-alphanumeric-output/ http://www.rubyfleebie.com/encryption-with-alphanumeric-outp... It cares more about readability than security but I guess it is safe enough.