@article{weko_12471_1, author = "荒井,正人 and 鍛,忠志 and 伊藤,浩道 and 手塚,悟 and 佐々木,良一", title = "企業情報向けグループ暗号システム", journal = "情報処理学会論文誌", year = "1999", volume = "40", number = "12", pages = "4378--4387", month = "dec" }