title: Integer ID obfuscation techniques
body: <p>I'm looking for an easy and reversible method of obfuscating integer IDs.  Ideally, I'd want the resulting obfuscation to be at most eight characters in length and non-sequential, meaning that the obfuscation of "1" should look nothing like the obfuscation for "2" and so on.</p>
  
  <p>This isn't meant to be secure by any means, so this isn't a huge concern.  Additionally, the integers I'll be obfuscating aren't large - between one and 10,000 - but I don't want any collisions, either.</p>
  
  <p>Does anybody have any ideas for something that would fit this criteria?</p>