Top 20 NuGet Security Packages

This package contains basic classes to implement a custom claim based security system
A high level abstraction over the Windows Certificate store, providing a simplified access model and informative exceptions to aid developers working with X.509 Certificates and the Windows Certificate Store.
Extensible versions of common Owin Oauth Middleware (Facebook, Google, Microsoft, etc) that allow for multi-tenant and other complex scenarios.
Windows 8.1 Client Library for The Identity Hub. The Identity Hub makes it easy to connect your app to all major identity providers like Microsoft, Facebook, Google, Twitter, Linked In and more. For more information see https://www.theidentityhub.com
Windows Desktop Client Library for The Identity Hub. The Identity Hub makes it easy to connect your app to all major identity providers like Microsoft, Facebook, Google, Twitter, Linked In and more. For more information see https://www.theidentityhub.com
SDK tools for Windows Phone 8 users to consume the Yammer API via Oauth.
Basic Authentication implementation for fluent security. No tests in place as I just wanted to throw this up to get things working. See readme.md for examples of how to use.
Latch is a service that lets you add an extra level of security to your online services to help prevent any unauthorized use.
Middleware that enables an application to support Weibo's OAuth authentication workflow.
APIFrame is a C#.NET library that implements the core components required for ASP.NET Web API development. It's a class library with logical separation of Client, Server and the supporting Framework.
Middleware that enables an application to support mixi's OAuth authentication workflow.
Middleware that enables an application to support Yahoo's OAuth authentication workflow.
Barricade is a lightweight membership system. An ASP.NET Web API security library that implements OAuth 2 authentication and claim based authorizations.
[FX4.0] This module contains BasicAuthenticationHttpModule module that allow you using easily a custom basic http authentication for every IIS/ASP.NET hosted applications, like also WCF REST, WCF SOAP, OData Services & so on...
Squire framework security API.
Middleware that enables an application to support Odnoklassniki OAuth authentication workflow.
Middleware that enables an application to support VK OAuth authentication workflow.
Middleware that enables an application to support Dropbox OAuth authentication workflow.
Middleware that enables an application to support Foursquare OAuth authentication workflow.