NT LAN Manager. The primary NT 4.0 security authentication protocol.
n. Stands for NT LanMan) The Windows NT Challenge/Response authentication protocol. This protocol uses encryption to help protect transmission of passwords.
NT LAN Manager. Authentication mechanism provided by Microsoft on Windows. Names and passwords are encrypted in a challenge/response system. Sometimes referred to as NT C/R.
NTLM is a Microsoft authentication protocol used with the SMB protocol. MS-CHAP is similar and is used for authentication with Microsoft remote access protocols. During protocol negotiation, the internal name is nt lm 0.12.