Securing Apps: Password Hashing, RBAC, OAuth, and OpenID Connect

Short summary

Comprehensive guide to web application security covering password hashing with bcrypt, salting to defeat rainbow tables, authentication vs authorization (RBAC), and modern auth patterns. Real breach examples—LinkedIn's unsalted MD5, Adobe's reversible encryption, RockYou2024's plaintext leak—show the cost of weak implementations. Core principles: one-way hashing, unique salts per password, cost factors to prevent brute force, strict authorization on every request.

• •Use bcrypt with unique salts and configurable cost factors instead of SHA-256 or MD5
• •Enforce authorization checks on every request, not just authentication at login
• •Real breaches demonstrate the cost of plaintext storage, unsalted hashes, and reversible encryption

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