@techreport{weko_61604_1,
   author	 = "毛利,寿志 and 小野,良司",
   title	 = "階層的ID-based暗号を用いたグループ鍵管理に関する一考察",
   year 	 = "2009",
   institution	 = "三菱電機, 三菱電機",
   number	 = "20(2009-DPS-138)",
   month	 = "feb"
}