2024年4月23日 · 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.

2019年2月15日 · 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.

2023年10月11日 · 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.

2023年9月21日 · 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.

2019年3月23日 · 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.

2024年8月23日 · 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 ...

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.

2025年1月31日 · Block NTLM Server Exception List allows administrators to specify servers that can still use NTLM for remote connection authentication, even if the Block NTLM policy is enabled. This setting is useful for maintaining compatibility with legacy systems that require NTLM while still enforcing stricter security measures for other connections.

2017年6月13日 · 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?