High Quality Content by WIKIPEDIA articles! Security Support Provider Interface (SSPI) is an API used by Microsoft Windows systems to perform a variety of security related operations such as authentication. SSPI is a proprietary variant of GSSAPI with extensions and very Windows-specific data types. It shipped with Windows NT 3.51 and Windows 95 with the NT LAN Manager Security Support Provider (NTLMSSP). For Windows 2000, an implementation of Kerberos 5 was added, using token formats conforming to the official protocol standard RFC 1964 (The Kerberos 5 GSSAPI mechanism) and providing wire-level interoperability with Kerberos 5 implementations from other vendors. The tokens generated and accepted by the SSPI are mostly compatible with the GSS-API so an SSPI client on Windows may be able to authenticate with a GSS-API server on UNIX depending on the specific circumstances. One significant shortcoming of SSPI is its lack of channel bindings, which makes some GSSAPI interoperability impossible.

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