February 2023
Intermediate
256 pages
5h 50m
Japanese
Content preview from アルゴリズム図鑑 増補改訂版 絵で見てわかる33のアルゴリズム
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No.
5-4
データを暗号化する方式は、暗号化と復号に同じ鍵を使う「共通鍵暗号方式」と、別々の鍵を
用いる「公開鍵暗号方式」に分けることができます。本節では、共通鍵暗号方式の仕組みと、そ
の問題点を説明します。
abc
?
「共通鍵暗号方式」は暗号化と復号にじ鍵い暗号方式
A B
abc abc
internet
A B
X
abc abc
abc
internet
共通鍵暗号方式データのりとりの
てい
A
さ
B
さにイ
ンターットデータとてい
と
さのにい
データは暗号化てり
01
02 03
A B
abc
internet
?
X
A B
abc
internet
? ?
X
A
さは鍵てデータ暗号化暗号文
に
A
さ暗号文
B
さに
A B
abc abc
internet
? ?
X
B
さは
A
さ暗号文じ鍵て復号
B
さはのデータ
とデータ暗号化てと意のにさ
とて
04 05
06
共通鍵暗号方式の暗号としては、「 シーザー暗号」「
AES
*3
」「
DES
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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.