bcrypt

A highly secure, adaptive password hashing function based on the Blowfish symmetric block cipher.

Designed by Niels Provos and David Mazières in 1999 (originally for OpenBSD), bcrypt remains an industry standard for protecting user passwords against brute-force attacks. The algorithm relies on an adjustable work factor (the cost parameter) that controls the number of hashing rounds, allowing developers to scale hashing times to match modern CPU performance. By combining a salt with a modified Blowfish key schedule, bcrypt ensures that identical passwords yield unique hashes, effectively neutralizing precomputed rainbow table attacks.

https://www.openwall.com/bcrypt/