Key Derivation Functions (KDFs) for password hashing and key derivation. Password-Based KDFs PBKDF2 (Password-Based Key Derivation Function 2) $$ DK = PBKDF2(password, salt, iterations, dkLen) $$ Algorithm: $$ \begin{aligned} T_i &= F(password, salt, iterations, i) \ F(password, salt, c, i) &= U_1 \oplus U_2 …