auth-patterns

Secure password storage requires hashing plain text passwords using slow algorithms like bcrypt or Argon2 with proper salting. You must apply these patterns during user registration to ensure credentials are never stored in plaintext.

Preventing user enumeration requires generic error handling during login and registration. Return identical error messages for invalid credentials whether the username exists or not, and use constant-time password verification to avoid timing attacks.

Both bcrypt and Argon2 are proven slow hashing algorithms for secure authentication. You should use either to enforce secure password storage with salting, ensuring that hashes are computationally expensive to crack.

Secure session management for mobile backends involves applying safe token handling best practices across web APIs and mobile apps. You must enforce secure authentication flows from development through production to protect active user sessions.

Constant-time verification matters because it prevents timing attacks during the login process. By ensuring password checks take the same amount of time regardless of match success, you protect user credentials and prevent user enumeration.