title: password rule for a casual website
body: <p>I am considering using the following rules for a casual website.</p>
  
  <ul>
  <li>8-20 chars long</li>
  <li>valid chars include letters, digits, and symbols</li>
  <li>case sensitive</li>
  </ul>
  
  <p>that's all. My question is, beside white space, is there other symbol that I should consider as "illegal"? Please keep in mind that it is a casual website so I don't need any password policy that is very restricted.</p>
  
  <p>Thanks,    </p>