What is the difference between NTLMv2 and Kerberos?

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The main difference between NTLM and Kerberos is in how the two protocols manage authentication. NTLM relies on a three-way handshake between the client and server to authenticate a user. Kerberos uses a two-part process that leverages a ticket granting service or key distribution center.

How do I change NTLMv1 to NTLMv2?

Click down to “Local Computer Policy -> Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options. Find the policy “Network Security: LAN Manager authentication level”. Right click on this policy and choose “Properties”. Choose “Send NTLMv2 response only/refuse LM & NTLM”.

Is NTLMv2 vulnerable?

NTLM is a rather veteran authentication protocol and quite vulnerable for relatively easy to initiate attacks. The fact that it is not secure, doesn’t make it easier to move to a better protocol (such as Kerberos), since many functions are dependent on it.

Is Kerberos more secure than NTLMv2?

It then encrypts this with the hash of the user’s password with the relatively weak DES algorithm. NTLMv2 gives a better defense against replay attacks and brute-force attacks. However, Kerberos is an even more secure authentication protocol because of its use of encrypted tickets.

How do I know if I have Kerberos or NTLM?

Once Kerberos logging is enabled, then, log into stuff and watch the event log. If you’re using Kerberos, then you’ll see the activity in the event log. If you are passing your credentials and you don’t see any Kerberos activity in the event log, then you’re using NTLM.

What will replace Kerberos?

There are no real competitors to replace Kerberos so far. Most of the advancements in security are to protect your password or provide a different method of validating who you are to Kerberos. Kerberos is still the back-end technology.

How do I configure NTLMv2?

No domain controller configuration is required to support NTLM 2.
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To activate NTLM 2 on the client, follow these steps:

Start Registry Editor (Regedit.exe).
Locate and click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control.
Create an LSA registry key in the registry key listed above.

How do I turn off NTLMv1?

What is NTLMv2 used for?

LAN Manager authentication includes the LM, NTLM, and NTLMv2 variants, and it’s the protocol that is used to authenticate all client devices running the Windows operating system when they perform the following operations: Join a domain. Authenticate between Active Directory forests.

Should we disable NTLM?

To disable NTLM within the domain, the setting NTLM authentication in this domain is set to the value Deny all. The NTLM authentication request of the web server will be blocked on the DC (Event ID 4004).
Example.

Hostname	Setting	Value
client01	Add remote server exceptions for NTLM authentication	192.168.1.112

Is NTLMv2 based on MD4?

NTLMv2 (NT hash) of the password is calculated by using an unsalted MD4 hash algorithm.

Why is NTLM still used?

Current applications. NTLM authentication is still supported and must be used for Windows authentication with systems configured as a member of a workgroup. NTLM authentication is also used for local logon authentication on non-domain controllers.

How do you tell if you are using NTLM?

To find applications that use NTLMv1, enable Logon Success Auditing on the domain controller, and then look for Success auditing Event 4624, which contains information about the version of NTLM.

Is Kerberos obsolete?

Is Kerberos Obsolete? Kerberos is far from obsolete and has proven itself an adequate security-access control protocol, despite attackers’ ability to crack it. The primary advantage of Kerberos is the ability to use strong encryption algorithms to protect passwords and authentication tickets.

Is Kerberos better than LDAP?

Different Levels of Complexity: Both protocols have varying levels of complexity within their internal workings. While considered safer and more robust, Kerberos is significantly more complex to configure and in its protocol than LDAP.

How do I enable NTLMv2 authentication?

To activate NTLM 2 on the client, follow these steps:

Start Registry Editor (Regedit.exe).
Locate and click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control.
Create an LSA registry key in the registry key listed above.

Should I disable NTLMv2?

We recommend disabling NTLMv1 and NTLMv2 protocols and use Kerberos due to the following reasons: NTLM has very weak encryption.

Is it OK to disable NTLM?

If necessary, you can create an exception list to allow specific servers to use NTLM authentication. At a minimum, you want to disable NTLMv1 because it is a glaring security hole in your environment. To do that, use the Group Policy setting Network Security: LAN Manager authentication level.

What happens when you disable NTLM?

Does Windows 10 still use NTLM?

Although Microsoft Kerberos is the protocol of choice, NTLM is still supported.

Are NTLM hashes easy to crack?

Windows 10 passwords stored as NTLM hashes can be dumped and exfiltrated to an attacker’s system in seconds. The hashes can be very easily brute-forced and cracked to reveal the passwords in plaintext using a combination of tools, including Mimikatz, ProcDump, John the Ripper, and Hashcat.

Does pass the hash work with NTLMv2?

NTLM has been succeeded by NTLMv2, which is a hardened version of the original NTLM protocol. NTLMv2 includes a time-based response,which makes simple pass the hash attacks impossible.

Why should I disable NTLM?

At a minimum, you want to disable NTLMv1 because it is a glaring security hole in your environment. To do that, use the Group Policy setting Network Security: LAN Manager authentication level.

What are drawbacks of Kerberos?

Biggest lose: assumption of secure time system, and resolution of synchronization required. Could be fixed by challenge-response protocol during auth handshake. Password guessing: no authentication is required to request a ticket, hence attacker can gather equivalent of /etc/passwd by requesting many tickets.

Why is Kerberos so complicated?

Kerberos is a vast improvement on previous authorization technologies. The strong cryptography and third-party ticket authorization make it much more difficult for cybercriminals to infiltrate your network. It is not totally without flaws, and in order to defend against those flaws, you need to first understand them.