title: Generating a unique 5 character sequence of random upper/lower letters?
body: <p>I'm just wondering what the usual method is of generating a unique string of random upper/lowercase letters of arbitrary length?</p>
  
  <p>My immediate thought would be to use a guid generator provided by the programming framework I use and then apply a well known hashing algorithm to the guid.</p>
  
  <p>If this is the case, what types of hashing functions do I need to look into?</p>
  
  <p>Thanks</p>