What is a Microsoft-compatible security key?
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Microsoft has been aligned with the FIDO Alliance 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. See FIDO2 security keys features and providers.
The FIDO2 CTAP specification 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:
||Feature / Extension trust
||Why is this required?
|1||Resident key||This feature enables the security key to be portable, where your credential is stored on the security key|
|2||Client pin||This feature enables you to protect your credentials with a second factor and applies to security keys that do not have an user interface|
|3||hmac-secret||This extension ensures you can sign-in to your device when it's off-line or in airplane mode|
|4||Multiple accounts per RP||This feature ensures you can use the same security key across multiple services like Microsoft Account (MSA) and Azure Active Directory (AAD)|