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.
5-9
デジタル署名は、メッセージ認証コードが実現する「認証」と「改ざんの検出」の
2
つの機能に
加え、「否認防止」も保証する仕組みです。メッセージ認証コードは、共通鍵を用いる仕組みであ
るため、鍵を持つ受信者もメッセージの送信者である可能性が残ってしまい、「否認」の問題を防
ぐことができませんでした。一方、デジタル署名の仕組みでは、送信者にしか作成できない「デ
ジタル署名」と呼ばれるデータを用いて、メッセージの作成者を特定します。
5-8
p.172
A B
internet
abc
デジタル署名のて
A
さ
B
さにメッセージと
internet
A B
abc
のとデジタル署名デジタル署名は
A
さにいにてい
01
02
internet
A B
abc
abc
A
さのデジタル署名さメッセージて合の
A
さ
と証さ
internet
A B
abc
abc
abc
?
S
P
B
さはデジタル署名の証と
はデジタル署名とは
はデジタル署名の方法に
てい ...
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