ただ、PPAPはセキュリティ対策としては脆弱だ。暗号化ファイルを添付したメールと、パスワードを記したメールが同じ経路を通るため、悪意のある攻撃者が簡単に解凍できてしまうからである。実はPPAPという名称は、こうした脆弱なファイル送信方法をやめようと訴えるために、当時はやっていたネット動画をもじって命名されたものだ。そして2020年のデジタル改革担当大臣（当時）によるPPAP廃止宣言により、“脱PP ...

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