Ravi Mukkamala Srikanth Balusani Active Certificates: A New Paradigm in Digital Certificate Management. 30-40 2002 conf/icppw/2002 ICPP Workshops http://csdl.computer.org/comp/proceedings/icppw/2002/1680/00/16800030abs.htm db/conf/icppw/icppw2002.html#MukkamalaB02