Duong Anh Duc Hoang Kiem Tran Minh Triet Luong Han Co The Advanced Encryption Standard and its Application in the Examination Security in Vietnam. 171-176 2002 conf/itcc/2002 ITCC http://csdl.computer.org/comp/proceedings/itcc/2002/1506/00/15060171abs.htm db/conf/itcc/itcc2002.html#DucKTC02