#security #system-design #networking
Authentication is the act of verifying an identity of a user to make sure they're actually a person who they claimed to be.
Authorization is the act of controlling the access level of a user to certain parts in the system.
Authentication Factors are the ways for someone to be authenticated. There are 3 categories of authentication factors:
The weakest level of authentication is Single-factor authentication, where only a single factor is being used.
Multi-factor authentication is a method that involves two or more factors (like, both password and security tokens,...).
Authentication Protocols are the standards that define how should we handle authentication data between parties in a system.
Some popular protocols are [OAuth], SAML, FIDO, LDAP,...
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