What is the difference between authentication and authorization?
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Authentication and Authorization are distinct but related security concepts in applications.
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Authentication → Who are you?
It is the process of verifying a user’s identity. Common methods include username/password, OTP, biometrics, or OAuth logins (Google, Facebook).
Example: When you log in with your email and password, the system checks if your credentials are valid.
Outcome: Grants access to the system if identity is confirmed. -
Authorization → What can you do?
It determines what resources or actions the authenticated user is allowed to access.
Example: A regular user can view their profile but cannot access the admin dashboard.
Outcome: Grants or denies specific permissions based on user roles or policies.
Key Difference:
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Authentication comes first, then authorization.
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Authentication answers identity, authorization answers permissions.
In short: Authentication verifies who you are, Authorization controls what you can do.
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