Top 13 WordPress Authorization Plugins

Allows WordPress to authenticate, authorize, create and update users against Active Directory

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This plugin Adds Crazy Additional Password Protection and Security to your blog.

An authentication framework that handles authorization with external web services.

Allows users to login or register by authenticating with an existing Google, Facebook, LinkedIn, Github, Reddit (and more!) account via OAuth 2.0.

Simple, but strong HTTP security, to prevent Brute force attack. One-click solution!

Hides logo in WordPress login screen to make it clearer.

Authorizer limits login attempts, restricts access to specified users, and authenticates against external sources (e.g., Google, LDAP, or CAS).

Works with Active Directory Integration to take AD octet string and convert them to images which you can use in themes.

Plugin that allows users to enter the site in one click, using a single account Wargaming.net ID.

Cackle Social Login allows your visitors to login and register with 20+ Social Networks like for example Facebook, VK, Twitter, Google, LinkedIn, etc.

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This plug-in adds a `Login with MySpaceID' button to the login page.