Authentication & Authorization Timestamps: Backend Engineer Guide to Identity & Permissions
[0:00] Introduction to Authentication and Authorization Defines authentication as 'who are you' and authorization as 'what can you do' in a given context, setting the stage for the video's exploration of these concepts. [1:00] Historical Context of Authentication Traces authentication from pre-industrial implicit trust and wax seals, through medieval pass phrases, to the digital era with mainframes and the first password systems at MIT. [5:40] Evolution to Modern Cryptography and MFA Covers the 1970s cryptographic breakthroughs (Diffie-Hellman, Kerberos), the rise of multi-factor authentication combining knowledge, possession, and biometrics, and the challenges of biometric systems. [10:20] 21st Century Authentication and Future Trends Discusses modern frameworks like OAuth 2.0, JWT, zero trust, and passwordless systems, plus future candidates such as decentralized identity, behavioral biometrics, and post-quantum cryptography. [15:00] Core Components: Sessions, JWT, and Cookies Introduces sessions as server-side state for HTTP, JWT as stateless self-contained tokens, and cookies as browser-based storage for authentication tokens, explaining their roles and evolution. [21:40] JWT Advantages and Hybrid Approaches Details JWT benefits like statelessness and scalability, but also challenges like token revocation, and proposes a hybrid approach combining stateless JWT with a blacklist for enhanced control. [28:20] Stateful vs. Stateless Authentication Compares stateful authentication (session-based with server-side storage) and stateless authentication (JWT-based with self-contained tokens), outlining pros, cons, and use cases for each. [36:40] API Key-Based Authentication Explains API keys as a method for machine-to-machine communication, using examples like OpenAI's API, and contrasts them with human-interactive authentication flows.
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