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NTLM
Last modified: Friday, October 29, 2004 

Abbreviation for “Windows NT LAN Manager”

The NTLM protocol was the default for network authentication in the Windows NT 4.0 operating system. It is retained in Windows 2000 for compatibility with down-level clients and servers. NTLM is also used to authenticate logons to standalone computers with Windows 2000. Computers with Windows 3.11, Windows 95, Windows 98, or Windows NT 4.0 will use the NTLM protocol for network authentication in Windows 2000 domains. Computers running Windows 2000 will use NTLM when authenticating to servers with Windows NT 4.0 and when accessing resources in Windows NT 4.0 domains.*

NTLM uses a challenge-response mechanism for authentication, in which clients are able to prove their identities without sending a password to the server. It consists of three messages, commonly referred to as Type 1 (negotiation), Type 2 (challenge) and Type 3 (authentication). The protocol continues to be supported in Windows 2000 but has been replaced by Microsoft Kerberos as the default/standard.

* [ Source: Microsoft Knowledge Base]

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Microsoft home page 
The Microsoft home page hosts a collection of company news articles, as well as links to product information, training, support, free software, events, and company information.

The NTLM Authentication Protocol 
This article seeks to describe NTLM at an intermediate to advanced level of detail, suitable as a reference for implementers.

related categories

Network Protocols

Networks

Security

Standards

related terms

communications protocol

handshaking

LAN


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