Fareed Zaffar Gershon Kedem Ashish Gehani Paranoid: A Global Secure File Access Control System. 322-332 2005 conf/acsac/2005 ACSAC http://doi.ieeecomputersociety.org/10.1109/CSAC.2005.42 db/conf/acsac/acsac2005.html#ZaffarKG05