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windows/security/identity-protection/hello-for-business/microsoft-compatible-security-key.md
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---
title: Microsoft compatible security key
description: Windows<77>10 enables users to sign in to their device using a security key. How is a microsoft compatible security key different (and better) than any other FIDO2 security key
title: Microsoft-compatible security key
description: Windows<77>10 enables users to sign in to their device using a security key. How is a Microsoft-compatible security key different (and better) than any other FIDO2 security key
keywords: FIDO2, security key, CTAP, Hello, WHFB
ms.prod: w10
ms.mktglfcycl: deploy
ms.sitesec: library
ms.pagetype: security, mobile
author: aabhathipsay-MS
author: aabhathipsay
ms.author: aathipsa
ms.localizationpriority: medium
ms.date: 10/25/2018
ms.date: 11/14/2018
---
# What is a Microsoft compatible security key?
# What is a Microsoft-compatible security key?
> [!Warning]
> Some information relates to pre-released product that may change before it is commercially released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Microsoft has been aligned with the [FIDO Alliance](https://fidoalliance.org/) with a mission to replace passwords with an easy to use, strong 2FA credential. We have been working with our partners to extensively test and deliver a seamless and secure authentication experience to end users.
The [FIDO2 CTAP specification](https://fidoalliance.org/specs/fido-v2.0-id-20180227/fido-client-to-authenticator-protocol-v2.0-id-20180227.html) contains a few optional features and extensions which are crucial to provide that seamless and secure experience.
A security key **MUST** implement the following features and extensions from the FIDO2 CTAP protocol to be Microsoft compatible:
A security key **MUST** implement the following features and extensions from the FIDO2 CTAP protocol to be Microsoft-compatible:
| #</br> | Feature / Extension trust</br> | Why is this required? </br> |
| --- | --- | --- |