Jan Cederquist Muhammad Torabi Dashti Sjouke Mauw A Certified Email Protocol Using Key Chains. 525-530 2007 conf/aina/2007w1 AINA Workshops (1) http://doi.ieeecomputersociety.org/10.1109/AINAW.2007.10 db/conf/aina/ainaw2007-1.html#CederquistDM07