This policy setting lets you allow signature key-based certificates to be enumerated and available for logon.If you enable this policy setting then any certificates available on the smart card with a signature only key will be listed on the logon screen.If you disable or do not configure this policy setting any available smart card signature key-based certificates will not be listed on the logon screen.
Policy path:
Windows Components\Smart Card
Scope:
Machine
Supported on:
At least Windows Vista
Registry settings:
HKLM\SOFTWARE\Policies\Microsoft\Windows\SmartCardCredentialProvider!AllowSignatureOnlyKeys
Filename:
SmartCard.admx