Top 20 NuGet Security Packages

Common constructs for permission management.
HELOS Security Framework
A simple and straightforward OAuth 1.0a client library for .NET.
Pack for easy encryption and decryption of passwords in C#.
This package has been moved to Microsoft.CST.DevSkim
Common login module for OWIN websites
HTTP Basic Authentication with ASP.NET MVC
The project is divided into an API for managing HTTP Namespaces, including an object model for ACLs and Security Descriptors, and a UI with automatic elevation in Windows Vista for operations that require administrative privledge.
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A component in C# that wraps use of web-based credential page, hosted in Internet Explorer(SHDocVw). Allows use of consistent web domain to share history of login information among web and desktop applications on the same machine. Acquired security token available to desktop application without it...
tCell .NET Agent Hooks package is used to provide the tCell .Net Agent with more detailed information from the users application.
Microsoft Visual Studio Team Services Authentication Library for Windows
Empty DNT.Identity project
Keyczar dotnet management Tool
Security Headers Samples - for ASP.Net Core. Several samples of CspFrames to target resource sources.