@InProceedings{johnson:2006-guests,
   AUTHOR="Matthew Johnson and Frank Stajano",
   TITLE="Usability of Security Management: Defining the Permissions of Guests",
   booktitle="The Fourteenth International Workshop on Security Protocols",
   year="2006",
   month="April",
   note = "To appear.",
   url="http://www.matthew.ath.cx/publications/2006-JohnsonSta-Guests.pdf",
}