JWT Security – Complete Enterprise Implementation for Modern Apps 🛡

🔐 JWT Architecture & Design
• Header, payload, signature internals
• Secure use of alg, kid, and claim design
• Stateless vs session-based auth from a security lens

💣 Real-World Vulnerabilities
• Algorithm confusion (none, RS256→HS256) with full exploit + fix
• Key management pitfalls (weak secrets, kid path-traversal, JWKS abuse)
• Token storage risks (localStorage, extensions, XSS, supply-chain issues)

🧬 Secure Implementation Blueprint
• End-to-end JWT lifecycle: auth → issuance → storage → usage → refresh → revocation
• Device binding, replay detection, anomaly detection & rate limiting
• Production-ready JWT service with Redis, logging, metrics & audit trails

🛠 Code You Can Drop Into Your Stack
• Python & Node-style examples
• Secure header/payload builders
• Signature verification pipelines with strict algorithm whitelisting
• Key rotation strategy with kid and overlapping keys

#AppSec