January 2021
Intermediate
240 pages
5h 32m
Japanese
Content preview from 図解まるわかり データベースのしくみ
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184
機密データを変換して保存する
6-8
外部からの不正なアクセスや、内部の不正行為、盗難や紛失によってデ
ータベース内の機密情報が流出してしまう事故は、たびたび話題になりま
すが、情報漏えいを防ぐために必要な対策の1 つとして、データベースの
情報を暗号化することが挙げられます。
です。例えば「東京都渋谷区」という住所のデータを
暗号化でそのままでは意味のわからないデータに変換して保存すれば、外
部から見られても内容を読み取ることはできません（図6-14）。暗号化さ
れたデータは特別な処理でもとに戻しますが、これを復号化といいます。
データを保存するときの暗号化を行うタイミングによって以下のような
方式があります（図6-15）。それぞれ対応できる対策の範囲や実装方法が
異なります。
❶
データを格納する前にアプリケーションで暗号化してから保存する
方法です。データベースには暗号化された状態でデータが保存される
ので、データを取得する場合も暗号化された状態で取得することにな
り、アプリケーション側で復号化を行います。
❷
多くのデータベース管理システムには暗号化の機能があります。管
理システム側でデータの格納・取得時に暗号化や復号処理を行うた
め、アプリケーション側では暗号化を意識する必要がなく便利です。
❸
データを格納しているストレージの機器や ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.