libntlm0 - 1.6-4 main

NTLM is an authentication protocol used in various Microsoft network
protocol implementations and supported by the NTLM Security Support
Provider ("NTLMSSP"). Originally used for authentication and negotiation
of secure DCE/RPC, NTLM is also used throughout Microsoft's systems as
an integrated single sign-on mechanism.
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NTLM employs 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).