This document discusses secure ways to store user credentials and passwords. It introduces hashing and salting as techniques to securely store passwords. Hashing involves generating a unique string from a password, while salting adds a random string to the password before hashing. This prevents hashed passwords from being decrypted if the hash is obtained, and ensures even identical passwords have different hashes when salted differently. The document outlines how hashing and salting of passwords can be implemented when users register and login, providing a secure way to authenticate users without revealing their actual passwords.