Top 20 NuGet 2fa Packages

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Yoti .NET SDK, providing Yoti API support for Login, Verify (2FA) and Age Verification
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Notakey .NET SDK for requesting and verifying verification
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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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An implementation of TOTP which is commonly used for multi factor authentication by using a shared key between the client and the server to generate and verify one time use codes. For documentation, visit https://github.com/kspearrin/Otp.NET
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OASIS OTP authentication service integration component.
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Yoti Owin .NET SDK, providing Yoti API support for Login, Verify (2FA) and Age Verification
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This is a client of Zamanak (www.zamanak.ir) web service
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OtpSharp for .NET Core / NetStandard
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.Net library for TOTP Two Factor Authentication (TFA / 2FA)
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An ASP.NET Core library for generating and validating one time passwords for google authenticator.
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LaunchKey Windows Phone SDK
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Sentinel API SDK for .NET applications
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This is a helper library for two factor Authenticator Getting started guide: https://github.com/PaulMiami/Authenticator/wiki/Getting-started Change log: https://github.com/PaulMiami/Authenticator/wiki/Change-log
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This is a helper library for two factor Authenticator Getting started guide: https://github.com/PaulMiami/Authenticator/wiki/Getting-started Change log: https://github.com/PaulMiami/Authenticator/wiki/Change-log
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This is a helper library for two factor Authenticator Getting started guide: https://github.com/PaulMiami/Authenticator/wiki/Getting-started Change log: https://github.com/PaulMiami/Authenticator/wiki/Change-log
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LaunchKey .NET SDK
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HMAC-Based One-Time Password Algorithm Implementation for dotnet core. Designed to support two factor authentication with common authenticator apps like the Microsoft and Google authenticators.
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FIDO Universal 2nd Factor (U2F) library for .NET. Please have a look at the project page for examples.