Apr 23, 2024 · What is NTLM? NTLM is an authentication protocol. It was the default protocol used in old windows versions, but it’s still used today. If for any reason Kerberos fails, NTLM will be used instead. NTLM has a challenge/response mechanism. Here is how the NTLM flow works:

The following steps present an outline of NTLM noninteractive authentication. The first step provides the user's NTLM credentials and occurs only as part of the interactive authentication (logon) process. (Interactive authentication only) A user accesses a client computer and provides a domain name, user name, and password.

Feb 15, 2019 · The following is a scenario-based example in which IIS is configured to support only the NTLM protocol. In IIS 6.0 and in earlier versions, this is done by having the NTAuthenticationProviders metabase key set to "NTLM". In IIS 7.0 and in later versions, only the NTLM protocol must be listed as a provider in the <windowsAuthentication> section.

Oct 11, 2023 · NTLM does this by proving knowledge of a password during a challenge and response exchange without revealing the password to anyone. The way NTLM works has benefits that have made its use popular in the past: NTLM doesn’t require local network connection to a Domain Controller. NTLM is the only protocol supported when using local accounts.

Sep 21, 2023 · Using NTLM does not send the account's clear password or even the password hash of over the wire. Instead, it uses a challenge / response protocol where the server sends the client a challenge (random number called a nonce), which the client will encrypt using the password hash as one of the inputs, then returns it to the server.

Mar 23, 2019 · Requirements for Kerberos and NTLM authentication Kerberos, several aspects needed: 1) Client and Server must join a domain, and the trusted third party exists; if client and server are in different domain, these two domains must be configured as two-way trust.

Jun 13, 2017 · If there's a more secure hashing algorithm to LM being utilised on a system (NTLM), then why still implement LM hashes instead of completely replacing it with the newer, more secure one? Why maim the security benefits of a stronger hash algorithm by including it alongside a weaker one that can be used to easily compromise the system anyway?

NTLM uses MD4 and DES in a weak way which is well known (5 NULL bytes yada yada yada); NTLMv2 uses HMAC-MD5 based on more than just the password and challenge, which is where the “blob” comes in. So that’s covered off the “challenge”, “HMAC-MD5″ and “blob” that’s missing from the John hash I’m having to build up from scratch.

Mar 1, 2020 · NTLM authentication is the default authentication method when the application is configured to use Windows Authentication. This is because Kerberos requires extra configuration steps and the client needs access to the Kerberos infrastructure (i.e. Domain Controller).

Aug 23, 2024 · Blocking NTLM authentication prevents tricking clients into sending NTLM requests to malicious servers, which counteracts brute force, cracking, relay, and pass-the-hash attacks. NTLM blocking is also required for forcing an organization's authentication to Kerberos, which is more secure because it verifies identities with its ticket system and ...