Why it matters

PBKDF2 is legacy password KDF. Understanding shapes crypto choice.

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The architecture

PRK = HMAC iterated N times over password + salt.

OWASP: 600k iterations minimum for SHA-256.

PBKDF2 flowPassword + saltinputN iterations HMACslow down brute forceDerived keyoutputArgon2 + scrypt modern preferred; PBKDF2 still FIPS-compliant + widely deployed
PBKDF2.
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How it works end to end

RFC 2898.

N iterations = 600k+ modern.

Argon2 preferred modern.

FIPS-approved.