Cryptography Articles & Guides
Educational articles on cryptographic primitives used in JWT authentication — HMAC, SHA family hashes, random key generation, and secure encoding.
HMAC Explained: How to Generate and Verify HMAC Signatures Securely
What HMAC is, how it differs from plain hashing and encryption, how to generate an HMAC key and signature in Node.js, Python, and Go, and common pitfalls.
RSA Key Pairs Explained: Generating and Using RSA Keys for JWT Signing (RS256)
How RSA key pairs work, how they differ from HS256 shared secrets, and how to generate and use them for RS256 JWT signing in Node.js, Python, and Go.
AES-256 Key Generation: A Practical Guide to Symmetric Encryption Keys
How AES-256 keys work, why 256-bit matters, how to generate them securely in Node.js, Python, and Go, and where to store them. Free key generator included.
JWT Brute Force Attacks: How They Work and How to Stop Them
Learn how offline JWT brute force attacks crack weak HMAC secrets, how fast GPUs try candidates, and how to generate secrets that cannot be cracked.
Base64 and Base64URL Encoding in JWTs Explained
Understand why JWTs use Base64URL encoding, how it differs from standard Base64, and how to encode and decode JWT parts correctly in any language.
The Definitive Guide to JWT Secret Entropy
Understand why high-entropy secrets are critical for HS256 JWT security and learn how to generate cryptographically secure signing keys.
How to Generate a Secure API Key in Node.js
Learn the professional way to generate a secure API key in Node.js using the built-in crypto module. Practical examples for production-ready security.