Explain the difference between authentication and authorization.
4 minbeginnerASP.NET-Coreauthenticationauthorizationsecurity
Quick Answer
Authentication verifies *who* a user is (validating credentials/identity). Authorization determines *what* that authenticated user is allowed to do (permissions, roles, policies). Authentication always precedes authorization, and the two are enforced by separate middleware in ASP.NET Core.
Detailed Answer
Authentication is the process of verifying WHO the user is (identity verification).
- Confirms user identity through credentials (username/password, tokens, biometrics)
- Answers: "Are you who you claim to be?"
- Example: Logging in with username and password
Authorization is the process of verifying WHAT the user can access (permission verification).
- Determines what resources/actions an authenticated user can access
- Answers: "What are you allowed to do?"
- Example: Checking if a user has admin rights to delete records
Key Differences:
- Authentication comes before authorization
- Authentication verifies identity; authorization verifies permissions
- Authentication uses credentials; authorization uses roles, policies, and claims
- You can be authenticated but not authorized for specific resources
Example Flow:
User Login → Authentication (verify credentials) → User Authenticated
↓
Access Admin Panel → Authorization (check role) → Access Granted/Denied