May 2019
Beginner to intermediate
296 pages
6h 58m
Japanese
Content preview from IT用語図鑑 ビジネスで使える厳選キーワード256
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201
5
関連用語
用語に関連する話
用語の使用例
暗 号 化と復 号
盗聴されても中身がわからないようにする
誰でも読めるような普 通 の 文 章を平 文と言 い、他 の人 に見られ て困る場 合に使 われる、
通常は見ても意味のわからない文章を暗号文と言う。平文から暗号文を作成することを
暗号化と言い、暗号文から平文に戻すことを復号と言う。通信相手にデータを渡すとき、
途中の経路において盗聴されても中身がわからないようにするために暗号が使われる。
第三者が暗号を読み解く
暗号を用いて通信をしている当
事者以外の人が、推測した鍵で暗
号文を復号して平文に戻したり、
平文に戻すための鍵を探すこと
を解読と言う。
古典暗号の代表例
古くから用いられた古典暗号と
して、平文の文字に別の文字を割
り当てる換字式暗号や、平文の文
字を入れ替える転置式暗号など
が知られている。
現代暗号の特徴
古典暗号では変換ルールがわか
れば簡単に解読できるが、変換
ルールが知られても鍵さえ知ら
れなければ安全なものを現代暗
号と言う。
☐
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△？
△○
✕
☐
！
☐
△
✕
○
✕
△
○
△
○
✕
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△◎
Keyword
178
▶
あ んごうか
▶
ふ くご う
「ファイルが 暗 号化されているけど、どうやって復号できるの？」
ハ イブリッド 暗 号
……P202
電子署名
……P204
証明書
……P205
SSL/TLS
……P206
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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.