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How to Password a Folder in Windows 11! Easy & Secure!

2025/8/25 Edited to

... Read moreWindows 11って「フォルダにそのままパスワード設定」する機能は意外と見つからなくて、私も最初は迷いました。結論としては、“パスワードで開く”というより「暗号化・ロックで第三者のアクセスを防ぐ」方向で考えるとスムーズです。ここでは、EFSを有効にする流れや、よくつまずくポイント(鍵マーク、ファイル転送、Homeエディション)を補足します。 ■方法1:EFS(暗号化)でフォルダを保護(Pro/Enterprise向け) EFSはWindowsのユーザーアカウントに紐づけて暗号化する仕組みで、他ユーザーで開けなくできます。 1) 対象フォルダーを右クリック →[プロパティ] 2) [詳細設定]→「内容を暗号化してデータを保護」にチェック →[OK] 3) 「このフォルダーに適用」+必要なら「サブフォルダーとファイルにも適用」を選択 暗号化後にフォルダアイコンへ“鍵マーク”が付くことがあります。これは「暗号化(またはアクセス制御)が有効」のサインなので、基本的に異常ではありません。解除したい場合は同じ場所のチェックを外します。 ■EFSで注意したい点(ファイル転送・バックアップ) EFSは“そのPCのそのユーザー”で復号できるのが強みですが、逆に言うと注意点もあります。 ・別PCにコピーすると、相手側で開けず困ることがある(EFSファイル転送の落とし穴) ・Windowsの再インストールやアカウント破損で復号できなくなるリスク 私がやってよかったのは、EFS証明書(暗号化キー)を必ずバックアップしておくこと。エクスポートしてUSBなど安全な場所に保管しておくと、万一のとき安心です。 ■方法2:BitLockerで“ドライブごと”ロック(鍵をかけるイメージに近い) フォルダ単体ではなく、保存しているドライブ/パーティション全体を暗号化するのがBitLockerです。「PCを落とした・盗まれた」みたいなケースに強い印象でした。専用ツール(例:Partition Assistant)経由で管理できる場合もあり、Windows 11 Homeでも状況によっては代替手段を検討できます。 ■Zipファイルにパスワード設定(共有・持ち出し向け) 「フォルダごと渡したい」「メール添付したい」なら、フォルダをZIP化してパスワード設定するのが手軽でした。ただし、ZIPの暗号方式はツールによって強度が変わるので、できればAES対応の圧縮ソフトを選ぶのがおすすめです。 ■Googleドライブは“パスワードをかけられない?”対策 Googleドライブ自体に“ファイル単体のパスワード”を直接付けられないことが多いので、私は「アップロード前にZIPへパスワード設定」か「共有権限(閲覧者/編集者)を厳密に設定」で運用しています。 ■Notionページにパスワードをかけたい場合 Notionはページ単位のパスワード機能が標準では弱いことがあるので、共有範囲を絞る(ワークスペース権限)+必要なら外部公開しない、が現実的でした。 フォルダ保護は「何から守りたいか(家族の覗き見/社内PCの別ユーザー/紛失盗難/共有時の漏えい)」で最適解が変わります。私は、PC内はEFSやBitLocker、持ち出しや共有はZIPパスワード、クラウドは共有権限、の組み合わせが一番運用しやすかったです。

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