title: Portable (PHPass) password hashes. Should I use them?
body: <p>I'm installing a user registration script (Tank Auth) for my website.</p>
  
  <p>In the installation guide its says, </p>
  
  <blockquote>
    <p>WARNING: By default the library generates strong system-specific
    password hashes that are not portable.
    It means that once created, user
    database cannot be dumped and exported
    to another server. This behavior can
    be changed in config-file as well.</p>
  </blockquote>
  
  <p>This put me in a dilemma. In the future I may want to change servers but I don't want weak passwords either. Are portable password hashes a big risk? And more importantly, what do they mean by hashes? Is it the character length?</p>