Top 20 NuGet Security Packages

Microsoft IIS Provider extension for ACMESharp
CloudFlare Provider extension for ACMESharp
OAuth for the .Net Core framework - made super easy
A Secure-ish Crypto Execution Module.
Simple ASP.NET 5 middleware that allows for hard-coding claims and automatically authenticates the user to simplify local development.
SPID authentication, SAML2 compliant.
DNS-Made-Easy Provider extension for ACMESharp
ASP.NET Core Identity IPasswordHasher implementation using Scrypt.NET
Verify Swedish personal identity numbers.
BasicAuth Middleware for AspNet Core
CodeNode.Identity - An implementation of ASP.NET Identity
A portable version of the .NET client library for Google Play Services OAuth
Nequeo security component
RFC 3161 time-stamping client library
Nequeo security Ocsp component
Nequeo security manager component
zxm.AspNetCore.Authentication.Hmac is an extensions to authentication with HMAC.
ArpexId authentication client.
Microsoft Graph (Azure Endpoint 2.0) Authentication for ServiceStack