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ざっくりとした認証と認可のイメージ

認証と認可の違い

システム的には認証と認可って組み合わせることが多いですが、2つの違いを説明する時のイメージ

認証(Authentication)

あなたは誰か確認する。
方法はいろいろあるけど運転免許証とかパスポートとかで本人と認証するイメージするとわかりやすいかも。指紋認証とか顔認証とかも

認可(Authorization)

~していいぞ。
認可は権限を与える(~することを許可する)イメージ
認証は含まれない。
たとえば電車乗る時にきっぷ買うけど(最近はほとんどSuicaか)
改札で切符の確認はするけど本人確認はしないのと同じイメージ
切符を買うことで乗車区間内の電車に乗ることが認可される

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