“Extensions to the Kerberos Protocol Windows 2000 implements extensions to the Kerberos protocol that permit initial authentication using public key certificates rather than conventional shared secret keys. This enhancement allows the protocol to support interactive logon with a smart card. The extensions for public key authentication are based on a draft specification submitted to the IETF working group by a number of third parties with interests in public key technology. Microsoft is participating in the standards process and will continue to support its efforts.”