PBKDF2-HMAC
PBKDF2-HMAC is the HMAC-based password key derivation function defined in PKCS#5, multiplying the cost of brute force through c iterations of HMAC.
Purpose
Derives encryption keys from passwords; the high iteration count makes brute force cost c times as much — the traditional standard for password storage and key derivation.
Mechanism
DK = T_1 || T_2 || ...，T_i = F(P, S || INT(i))，F(P, X) = U_1 XOR U_2 XOR ... XOR U_c，U_1=HMAC(P, X)，U_j=HMAC(P, U_{j-1})。
Use cases
- Password key derivation
- Legacy password hashing
- WPA/WPA2 PSK
Related tools
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