Passphrase to Key Derivation
Generate a secure passphrase, hash it to derive a key, and use the key for HMAC signing.
このレシピの使いどころ
Demonstrates passphrase-based key derivation for user-facing encryption. Users remember the passphrase, the system derives the cryptographic key.
ステップ
Passphrase Generator
このツールを試す →Create a memorable passphrase
Password Strength Checker
このツールを試す →Verify passphrase entropy
Hash Calculator
このツールを試す →Derive encryption key
HMAC Generator
このツールを試す →Test the derived key
よくある質問
Why use a passphrase instead of a random key?
Passphrases are human-memorable. A 6-word diceware passphrase has ~77 bits of entropy — strong enough for most applications while being something users can remember.
Should I use SHA-256 for key derivation in production?
No. Use PBKDF2, scrypt, or Argon2 which add computational cost (iterations/memory) to resist brute-force. This recipe uses SHA-256 for demonstration only.
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