2000 2009 3 11 11 E-mail: masashi.une@boj.or.jp E-mail: yuuko.tamura@boj.or.jp E-mail: tsutomu@ynu.ac.jp / /2009.7 143 1. ATM 2004 2004 Wielandt [1998] NRC [2007] Lancaster [2008] NASPO [2008] 2004 144 /2009.7 2 3 4 5 6 2. 1 . 1 1 2004 2006 van Renesse [2005] NRC [2007] 145 1 3 1 2 2004 1 1 verification ID 2 146 /2009.7 1 � identification 3 . 2004 1 2004 4 4 2004 3 1 � 4 confidentiality integrity