Top 20 NuGet Security Packages

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Yoti Owin .NET SDK, providing Yoti API support for Login, Verify (2FA) and Age Verification
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- Generation and parsing of PKCS-12 files. - X.509: Generators and parsers for V1 and V3 certificates, V2 CRLs and attribute certificates. - PBE algorithms supported by PbeUtilities: PBEwithMD2andDES-CBC, PBEwithMD2andRC2-CBC, PBEwithMD5andDES-CBC, PBEwithMD5andRC2-CBC, PBEwithSHA1andDES-CBC, PBEw...
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Cleans HTML from constructs that can be used for cross site scripting (XSS)
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AWS Provider extension for ACMESharp
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A MongoDB IUserAuthRepository to persist User registration and auth info in a NoSQL Mongo DB. Implements ServiceStack's built-in AuthProvider Model: https://github.com/ServiceStack/ServiceStack/wiki/Authentication-and-authorization inc. Twitter, Facebook, Basic, Digest, Crede...
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A RavenDB IUserAuthRepository to persist User registration and auth info in a NoSQL Raven DB. Implements ServiceStack's built-in AuthProvider Model: https://github.com/ServiceStack/ServiceStack/wiki/Authentication-and-authorization inc. Twitter, Facebook, Basic, Digest, Credentials...
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CryptSharp - use https://www.nuget.org/packages/BCrypt.Net-Next/ for password hashing, not this library.
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A JwtBearer authentication provider for Nancy.
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This code allow to fake a Jwt Bearer and build integration test for ASP.Net Core application. By this way we can fake any authentication we need, without the need to really authenticate a user.
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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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PowerShell Module library for ACMESharp POSH Module client.
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Kraken is a battle tested library for developing SharePoint applications that's been around since before 2010 and is used in many projects. This package includes libraries for .NET development that fall outside the scope of SharePoint itself. Both partial-trust and full-trust libraries are included;...
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Stormpath middleware for ASP.NET Core. Easily add authentication and authorization to ASP.NET Core applications.
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simple, no database required authentication for ASP.NET Core
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OpenID Connect server middleware for OWIN/Katana.
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Unified OAuth provider for Microsoft work, school, and personal accounts to be used with ASP.NET 4.5 OWIN
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IP*Works! is a comprehensive framework of easy-to-use components for Internet development, including FTP, HTTP, SMTP, POP, IMAP, LDAP, DNS, SMS, SOAP, etc.
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AspNetCore.Security.CAS Class Library
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OWIN middleware for providing a resource/action based authorization manager.
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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.