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⚡ One HLD concept. 60 seconds. Interview ready
Session-Based Authentication: How Cookies & Sessions Work
Session-based authentication uses cookies to remember users after login.
⚡ One HLD concept. 60 seconds. Interview ready
Understanding Token Expiration and Refresh Token Rotation
Token expiration and refresh token rotation secure user sessions by limiting token lifespan and preventing unauthorized access.
⚡ One HLD concept. 60 seconds. Interview ready
Access Tokens vs Refresh Tokens: How Token Renewal Works
Access tokens are short-lived tokens for API access, while refresh tokens renew them without re-login.
⚡ One HLD concept. 60 seconds. Interview ready
Understanding OpenID Connect (OIDC) for Authentication
OpenID Connect allows apps to authenticate users and verify their identities securely.
⚡ One HLD concept. 60 seconds. Interview ready
Understanding JWT Authentication: How JSON Web Tokens Work
JWTs allow secure user authentication without needing session storage.
⚡ One HLD concept. 60 seconds. Interview ready
OAuth 2.0: Access Data Without Sharing Your Password
OAuth 2.0 lets apps access user data securely without passwords.
⚡ One HLD concept. 60 seconds. Interview ready
Understanding mTLS: Microservices Authentication Explained
mTLS allows microservices to verify each other's identities using certificates.
⚡ One HLD concept. 60 seconds. Interview ready
HLD: Authentication vs Authorization Explained
Authentication verifies who you are, while authorization determines what you can do.
⚡ One HLD concept. 60 seconds. Interview ready
Token Bucket Rate Limiting Explained for Interviews
The Token Bucket algorithm helps manage how many requests a server can handle.
⚡ One HLD concept. 60 seconds. Interview ready
Understanding API Keys: Identification and Security
API keys help identify clients and control their access to APIs securely.
⚡ One HLD concept. 60 seconds. Interview ready
Token Bucket vs Leaky Bucket: Key Differences Explained
Token Bucket allows burst traffic, while Leaky Bucket smooths out traffic flow.
⚡ One HLD concept. 60 seconds. Interview ready
Zero Trust Architecture: Never Trust, Always Verify
Zero Trust Architecture ensures that no user or device is trusted by default.
⚡ One HLD concept. 60 seconds. Interview ready
HLD: Password Hashing and Salt Explained
Password hashing with unique salts ensures security by creating different hashes for identical passwords.
⚡ One HLD concept. 60 seconds. Interview ready
Secure API Design: 7 Essential Rules for Backend Engineers
Secure API design requires multiple strategies to protect sensitive data and access.