vCenter 9.x
vCenter Native Smart Card (deprecated in 8.x) is removed in VCF 9.x.
Removal of SSPI, CAC and RSA:
vCenter 9.0 discontinues support for Windows Session Authentication (SSPI) used as part of the Enhanced Authentication Plug-in, Smart Card support, and RSA SecurID. In place of SSPI, Smart Card, or RSA SecurID, users and administrators can configure and use Identity Federation with a supported Identity Provider to sign in to their vCenter system.