NTLMSSP (

NT LAN Manager In a Windows network, NT (New Technology) LAN Manager (NTLM) is a suite of Microsoft security protocols intended to provide authentication, integrity, and confidentiality to users. NTLM is the successor to the authentication protocol in Microsoft L ...

(NTLM) Security Support Provider) is a binary messaging protocol used by the Microsoft Security Support Provider Interface (SSPI) to facilitate NTLM challenge-response authentication and to negotiate integrity and confidentiality options. NTLMSSP is used wherever

SSPI Security Support Provider Interface (SSPI) is a component of Windows API that performs security-related operations such as authentication. SSPI functions as a common interface to several Security Support Providers (SSPs): A Security Support Provid ...

authentication is used including Server Message Block / CIFS extended security authentication, HTTP Negotiate authentication (e.g. IIS with IWA turned on) and MSRPC services. The NTLMSSP and NTLM challenge-response protocol have been documented in Microsoft's Open Protocol Specification.MS-NLMP - NT LAN MANAGER (NTLM) Authentication Protocol Specification

References

{{Compu-network-stub Microsoft Windows security technology Computer access control protocols