Reference

scrypt: The Memory-Hard GPU Cruncher

The focus of password-based key derivation functions (KDFs) is to derive a secret from a secret. This has included the usage of crypt, PBKDF2 and bcrypt, which use a number of cryptography rounds to slow down the operation and generally add cost. Unfortunately, as the processor gets faster, the barrier caused by the number of iterations will reduce. This is especially the case if we use GPUs. Overall, PBKDF2 does not use up…