Top 20 NuGet security Packages

Credential Management package is a wrapper for the Windows Credential Management API that supports both the old and the new style of UI
Cross-platform HttpClientHandler with TLS1.2 and Certificate Pinning
AESCryptoLib is an assembly/ library to encrypt strings with AES. The assembly was written and tested in .Net 4.8 and .Net Standard 2.0.
tCell Native Agent
Essensoft.AspNetCore.Payment
Open-source, cross-platform, multi-purpose security auditing tool - command line interface
ASP.NET Core security middleware enabling Twitch authentication.
ASP.NET Core security middleware enabling Spotify authentication.
Access Management Control
An implementation of HMAC for ASP.NET Core
OpenID Connect extensions for the OpenID Connect server middleware.
Crypteron CipherDB Agent for Entity Framework 6.x
Crypteron CipherStor for encrypting files and file streams destined for Azure Blob Storage, Amazon S3, SMB and local file servers
Crypteron CipherObject Agent for general object oriented encryption
.Net core Middleware, Add various headers to help secure your site. Disable XSS attacks with Content Security Policies, and make sure browsers do not mime sniff
ASP.NET Core security middleware enabling Vkontakte authentication.
ASP.NET Core security middleware enabling Slack authentication.
ASP.NET Core security middleware enabling Paypal authentication.
ASP.NET Core security middleware enabling Weixin authentication.
ASP.NET Core security middleware enabling Amazon authentication.