Top 20 NuGet Security Packages

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NWebsec is an easy to use security library for ASP.NET applications. With a few lines of config it lets you set important security headers, detect potentially dangerous redirects, control cache headers, and remove version headers. See project website for documentation.
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KeyChain plugin for Xamarin and Windows.
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OAuth authorization WebParts for Suave WebApp framework
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Implementation of Spotify authorization flows.
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JWT token base authenthication, Roles and claims authorization.
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Stormpath middleware for ASP.NET 4.5+. Easily add authentication and authorization to ASP.NET applications.
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OpenID Connect server middleware for OWIN/Katana.
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An ASP.NET Core library for generating and validating one time passwords for google authenticator.
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OpenIddict's core components, used to manage the applications, authorizations, scopes and tokens stored in the database.
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SecureBlackbox - the comprehensive suite of components and classes for digital security and secure networking
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Marten persistence layer for IdentityServer4 using postgresql as a document store
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ASP.NET Core External Security Provider for CloudFoundry
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A package to digitally sign and verify data(i.e. documents,etc)
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A library for integrating Privakey authentication to .NET-based web services. Privakey is a secure, password-free, multi-factor authentication service. For more information visit https://www.privakey.com or contact support@privakey.com
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A .Net port of jBCrypt implemented in C#. It uses a variant of the Blowfish encryption algorithm’s keying schedule, and introduces a work factor, which allows you to determine how expensive the hash function will be, allowing the algorithm to be "future-proof".
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NWebsec attributes for ASP.NET MVC 3/4/5 applications. NWebsec helps you set important security headers, detect potentially dangerous redirects, control cache headers, and remove version headers. See project website for documentation.
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This library provides core functionality for the NWebsec security libraries.
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The tCell .Net agent for Azure Web Apps
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Linq To DB persistence layer for IdentityServer4
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MongoDB persistence layer for IdentityServer4