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.
5-5
公開鍵暗号方式は、暗号化と復号に異なる鍵を用いる暗号方式です。暗号化と復号で別の鍵を
使うことから、「非対称暗号」と呼ばれることもあります。暗号化に使う鍵を「公開鍵」、復号に
使う鍵を「秘密鍵」といいます。
A B
X
abc
internet
公開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
A B
X
abc
internet
S
P
B
さ公開鍵
P
と鍵
S
01
02
公開鍵は
P
public key
鍵
は
S
secret key
てい
公開鍵暗号の具体的なアルゴリズムとしては、「
RSA
暗号」や「楕円曲線暗号」など
があり、現在は
RSA
暗号がよく使われています。
RSA
暗号は、その開発者である
Rivest
、
Shamir
、
Adleman
（ロナルド・リベスト、アディ・シャミア、レオナル
ド・エーデルマン）の頭文字から命名されました。この
3
人は
2002
年にチューリン
グ賞を受賞しています。
A B
X
abc
internet
S
P
の公開鍵
A
さに
A B
abc
internet
?
X
S
P
A B
abc
internet
?
X
P
abc
?
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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.