Drupal 8 incorporates a Modular Authentication System. This system allows you to do things like forcing HTTP authentication for a particular route or requiring an OAuth signature for accessing your REST API.

Here are the main contents of this talk

• What's Authentication and Authorization.
• Basic structure of an authentication provider. Meet AuthenticationProviderInterface.
• Core's built-in providers: HTTP Basic and Cookie.
• Contrib authentication providers: OAuth.
• Adding authentication to a custom route, an existing route, a REST resource and a View.
• Follow up in authentication: what's next and how to help.