PBKDF2
PBKDF2 is a widely deployed key-derivation function that slows password hashing with many iterations.
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PBKDF2 (Password-Based Key Derivation Function 2) repeatedly applies a pseudorandom function to stretch a password into a key, increasing the cost of brute-force against stolen hashes.
Why it matters
It remains common in enterprise and browser crypto APIs. Newer designs like Argon2 often offer better resistance to GPU/ASIC attacks when configured correctly.
PassTip tip
End users should still pick high-entropy secrets. Passphrase generator.