The Basics of User Authentication

Authentication establishes the identity of users or systems, and web applications generally need mechanisms for both account creation and recognizing returning users. Sending an email address and password with every request, often called Basic Authentication, is simple but impractical for browser-based applications because repeatedly entering or storing passwords creates usability and security concerns, though it can suit some command-line services. Using an unchanging, random user ID as proof of identity is more dangerous because a leaked ID cannot easily be revoked without creating a new account. A stronger common approach issues revocable, expiring, opaque session tokens, usually stored in cookies and validated against a database, allowing users to remain signed in while enabling logout and token invalidation. JWTs offer a stateless alternative that can avoid database lookups, but authentication remains difficult because secure implementations require careful password storage, breached-password protections, timing-attack defenses, privacy-conscious errors, safe cookie settings, and awareness of library vulnerabilities; authorization, which controls what authenticated users may do, is a separate concern.

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