How to: Authentication and Authorization
*Libraries for implementing user authentication and authorization.*

* [Aura.Auth](https://github.com/auraphp/Aura.Auth) - Provides authentication functionality and session tracking using various adapters.
* [SocialConnect Auth](https://github.com/socialConnect/auth) - An open source social sign (OAuth1\OAuth2\OpenID\OpenIDConnect).
* [Json Web Token](https://github.com/lcobucci/jwt) - Json Tokens to authenticate and transmit information.
* [OAuth 1.0 Client](https://github.com/thephpleague/oauth1-client) - An OAuth 1.0 client library.
* [OAuth 2.0 Client](https://github.com/thephpleague/oauth2-client) - An OAuth 2.0 client library.
* [OAuth2 Server](https://bshaffer.github.io/oauth2-server-php-docs/) - Another OAuth2 server implementation.
* [OAuth2 Server](https://oauth2.thephpleague.com/) - An OAuth2 authentication server, resource server and client library.
* [Opauth](https://github.com/opauth/opauth) - A multi-provider authentication framework.
* [Paseto](https://github.com/paragonie/paseto) - Platform-Agnostic Security Tokens.
* [PHP oAuthLib](https://github.com/daviddesberg/PHPoAuthLib) - Another OAuth library.
* [Sentinel Social](https://cartalyst.com/manual/sentinel-social/2.0) - A library for social network authentication.
* [Sentinel](https://cartalyst.com/manual/sentinel/2.0) - A framework agnostic authentication & authorisation library.
* [TwitterOAuth](https://github.com/abraham/twitteroauth) - A Twitter OAuth library.