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Engineering

SSL Certificate Chain: What It Is and How to Fix It

A missing intermediate certificate is the most common SSL misconfiguration. Learn what a certificate chain is and how to fix a broken one on Nginx, Apache, or Caddy.

March 5, 2026
Engineering

Passwordless Authentication: Magic Links vs Passkeys vs OTP

Passwords are one of the biggest security liabilities in modern software. Passwordless authentication replaces them with magic links, passkeys, and OTPs—methods that are faster, easier, and harder to compromise. This guide explains how each works, when to use them, and what to watch for during implementation.

Fung
February 24, 2026
Engineering

OAuth 2.0 Security Best Practices: PKCE, State Parameters & More

OAuth 2.0 is a widely adopted framework that lets applications access user resources safely, without ever exposing passwords or credentials. This guide breaks down OAuth 2.0 security in practical terms—covering PKCE, state parameters, token management, and more—to help you build secure, production-ready authorization systems.

Fung
February 24, 2026
Engineering

JWT Security Explained: Best Practices and Common Vulnerabilities

JSON Web Tokens (JWTs) are widely used for authentication and authorization because they let systems verify requests without relying on centralized session storage. This guide explains JWT security in practical terms—covering how they work, common vulnerabilities, and best practices for using them safely in production.

Fung
February 24, 2026

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