!!! Overview
[{$pagename}] ([NT LAN Manager] ([NTLM]) is a binary messaging protocol used by the [Microsoft] [Security Support Provider Interface] ([SSPI]) to facilitate [NTLM] [Challenge-response] [authentication]. 

%%warning
The security of [NTLMv1], [NTLMv2] and [MD4] and therefore all versions of [{$pagename}] has been __severely__ compromised and is considered [Cryptographically Weak] and lacks [Collision Resistance].
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[Windows Server 2003] supports the [NTLM] [Security Support Provider], Msv1_0.dll, to enable clients running [versions] of [Microsoft Windows] earlier than [Windows Server 2000] to [authenticate]. 

[NTLM] is the default [authentication protocol|Authentication Method] for [Windows NT] 4.0. The [NTLM] [Security Support Provider] includes the [NTLM and NTLMv2 authentication protocols|NTLM].

[Windows Server 2003] can use the [NTLM] [Security Support Provider] for the following:
* Client/server authentication
* Print services
* File access using [CIFS]/[SMB]
* Secure [RPC]/DCOM-based services
[{$pagename}] is used wherever [SSPI] [authentication] is used including [Server Message Block] / [Common Internet File System] ([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.[1]

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [NTLMSSP|Wikipedia:NTLMSSP|target='_blank'] - based on information obtained 2017-07-26 
* [#2] - [NTLMSSP|https://docs.microsoft.com/en-us/windows/win32/com/ntlmssp|target='_blank'] - based on information obtained 2020-07-26