Top 20 NuGet Security Packages

.NET and Xamarin libraries for authentication through the AeroGear mobile services
Adds additional OAuth providers for OWIN to use with ASP.NET
A signature creator and validator, along with some useful extensions. Inspired by the AWS Signature V4.
Authentication middleware that uses Firebase token (issuer / audience) as authentication for Mvc/Api controllers. The jwt validation validate the issuer and audience (firebase project), the token signature (using google certificates) and the token validity.
User security base library for developing apps on .NET Standard 2.0
A simple Have I been pwned API wrapper
HTTP server with minimal dependencies
Rebex.Pop3 is part of Rebex Secure Mail - a set of mail libraries that provide all you need for sending, receiving, encrypting, decrypting, signing, verifying, loading, saving and processing e-mail messages. Includes IMAP, EWS (Exchange Web Services), POP3 and SMTP clients; a high-level MailMessage ...
Rebex.Imap is part of Rebex Secure Mail - a set of mail libraries that provide all you need for sending, receiving, encrypting, decrypting, signing, verifying, loading, saving and processing e-mail messages. Includes IMAP, EWS (Exchange Web Services), POP3 and SMTP clients; a high-level MailMessage ...
Rebex.Smtp is part of Rebex Secure Mail - a set of mail libraries that provide all you need for sending, receiving, encrypting, decrypting, signing, verifying, loading, saving and processing e-mail messages. Includes IMAP, EWS (Exchange Web Services), POP3 and SMTP clients; a high-level MailMessage ...
Security static code analyzer for .NET
A MongoDB IUserAuthRepository to persist User registration and auth info in a NoSQL Mongo DB. Implements ServiceStack's built-in AuthProvider Model: http://docs.servicestack.net/authentication-and-authorization inc. Twitter, Facebook, Basic, Digest, Credentials Auth modes out...
A RavenDB IUserAuthRepository to persist User registration and auth info in a NoSQL Raven DB. Implements ServiceStack's built-in AuthProvider Model: http://docs.servicestack.net/authentication-and-authorization inc. Twitter, Facebook, Basic, Digest, Credentials Auth modes out-of-th...
OWIN middleware for providing a resource/action based authorization manager.
Enables a service to authenticate to Azure services using the developer's Azure Active Directory/ Microsoft account during development, and authenticate as itself (using OAuth 2.0 Client Credentials flow) when deployed to Azure.
A compatibility layer for sharing authentication tickets between Microsoft.Owin.Security and Microsoft.AspNetCore.Authentication.
Defines a basic security architecture.
.NET Standard 1.3 implementation of the NoiseSocket Protocol (revision 2 of the spec)
.NET and Xamarin libraries for the AeroGear Mobile Core
A simple, no-drama, reCAPTCHA validation library that works with ASP.NET Core, Razor Pages, MVC 5, and WebForms.