Top 20 NuGet Security Packages

Middleware that enables an application to support GitHubs OAuth 2.0 authentication workflow.
Middleware that enables an application to support Instagram OAuth authentication workflow.
Middleware that enables an application to support LinkedIn's OAuth 2.0 authentication workflow.
Middleware that enables an application to support Meetup OAuth authentication workflow.
Middleware that enables an application to support StackExchange OAuth authentication workflow.
Implementation of the Hawk authentication scheme for Web API v2 and Katana.
Javascript client for accessing secure WebAPI services incl. (social/facebook) authentication
Library provides WCF Rest behaviors extension - EnableCorsBehavior - CustomAuthenticationBehavior - TypedUriTemplateBehavior See more details here: https://github.com/cshandler/WebHttpBehaviorExtensions
Authentication for Web Develop
A solution for adding Federated Identity Scaffolding to a Windows 8 WinRT Project. See Project Site link for more details.
Simple OWIN stateful token authentication middleware for when you want to store token in database
Enables you to use the Hawk authentication scheme for SignalR connections from .NET client. No server-side modification are required (beside taking care of the order in the OWIN pipeline => not include SignalR prior to the Hawk authentication middleware).
A unified, simple to use library that enables developers storing, accessing, updating and deleting keys and passwords on multiple platforms. Internally, the library uses iOS KeyChain and Android KeyStore features. The library exposes KeyChainHelper which is a simple one-entry to the library on all p...
A .NET client library for Google Play Services OAuth
Windows Prison
Middleware that enables an application to support MyMail OAuth authentication workflow.
Check reCAPTCHA response in .Net
Infrastructure and configuration for building identity provider plugins for Affecto Authentication Server.
Components enforcing "secure by default" TLS implementations of core Internet Communication Protocols such as HTTP, FTP, SMTP, IMAP, LDAP, SOAP, and WebSockets, through simple, easy-to-use, and intuitive APIs.