Top 20 NuGet security Packages

CertificateProvider for ACMESharp using OpenSSL WinLib64
CertificateProvider for ACMESharp using OpenSSL WinLib32
Verify Swedish personal identity numbers.
DNS-Made-Easy Provider extension for ACMESharp
ASP.NET Core Identity IPasswordHasher implementation using Scrypt.NET
ASP.NET Core security middleware enabling VidZapper authentication.
Antix Common Security Code
Acheve.AspNetCore.TestHost.Security Class Library
Easy to use PKCS#11 based X.509 certificate store
SDK for accessing LaunchKey V3 endpoints.
An ACMESharp provider for OVH DNS.
.NET and Xamarin libraries for the AeroGear Mobile Core
Data access layer for the Owin Framework authorization middleware that uses the Prius ORM
Miruken abstractions for security
FSec is a tool for automatically running security tests for .NET programs. The tool provides some basic security testing functionality to discover vulnerabilities in an application, including: XSS, XML Bomb, XPath injection, SQL injection, URL tampering, URL bogus, ...
Advanced implementation of the Authentication filter and Authorization attribute for WebApi utilization.