The Architecture of Modern Authentication
Authentication has evolved significantly over the last decade. From simple session cookies to complex OAuth 2.0 flows, the landscape is constantly shifting to balance security with user experience.
The Death of Passwords
Passwords are inherently insecure. The average user recycles passwords across multiple services, meaning a breach in one system compromises many others.
Passkeys and WebAuthn
WebAuthn is the web standard that enables public-key cryptography for authentication. Instead of a password, your device stores a private key and registers a public key with the service.
How it Works
When you attempt to log in, the server sends a challenge. Your device signs this challenge using the private key (usually unlocked via biometrics like FaceID or TouchID).
Browser Support
Currently, over 90% of global web traffic originates from browsers that fully support the WebAuthn API.
Implementing Security in Next.js
In a Next.js App Router application, authentication should ideally be handled at the edge using Middleware.
Middleware Protection
By protecting routes in middleware, we ensure that unauthenticated requests never even hit our server components.
