AES-256暗号化

このツールの使い方

1. 1

   Choose 'Encrypt' or 'Decrypt' from the mode dropdown.

2. 2

   Type a passphrase into the password field — you'll need the exact same one to decrypt later.

3. 3

   Paste plain text to encrypt, or paste the base64 ciphertext to decrypt, into the text area.

4. 4

   Click 'Run' and copy the result from the output box below.

AES-256暗号化とは何ですか？

よくある活用例

• Encrypting a note, recovery phrase, or API key before pasting it into a chat, ticket, or shared document.

• Sending a short secret to a teammate who has agreed on a passphrase through a separate channel.

• Storing sensitive snippets in a password-protected form inside otherwise plain-text notes or a wiki.

• Demonstrating how AES-GCM, PBKDF2 key derivation, and random IVs work for a class or code review.

• Quickly checking that a base64 blob produced by this tool decrypts back to the expected text.

• Adding a layer of protection to clipboard or backup text on a shared or untrusted machine.

よくある質問