Passbased

Passbased is a term used to describe authentication methods that rely primarily on passwords as the user’s secret. In security discussions, passbased authentication involves a user providing a password, which is then verified by calculating a hash of the password with a stored salt and comparing it to a stored hash. Robust implementations use password hashing algorithms such as PBKDF2, bcrypt, scrypt, or Argon2 to make brute-force attacks more difficult. The use of salts prevents the reuse of hash values across users and protects against precomputed attacks.

In typical passbased systems, the server stores salted password hashes rather than plain-text passwords. During login, the server retrieves the user’s salt, hashes the provided password with that salt, and checks for a match. Defenses commonly accompany this process, including rate limiting, account lockout policies, and monitoring for suspicious activity. To bolster security, many implementations pair passwords with additional factors or controls, a practice known as multi-factor authentication (MFA). Organizations also encourage strong password practices and the use of password managers to reduce reuse and weak credentials.

Limitations of passbased authentication include vulnerability to phishing, credential stuffing, and password reuse across sites. Human factors—such as choosing weak passwords or reusing the same password—can significantly weaken security. As a result, there has been a shift in many environments toward passwordless approaches that rely on cryptographic keys or hardware authenticators, while passbased methods remain widely used due to compatibility and simplicity.

See also: password-based authentication, password hashing, multi-factor authentication, password policies, WebAuthn.