Asked by: Katya Cantor
technology and computing computer networking

What is difference between NTLM and Kerberos authentication?

Last Updated: 7th April, 2020

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The big difference is how the two protocolshandlethe authentication: NTLM uses a three-wayhandshakebetween the client and server and Kerberosuses atwo-way handshake using a ticket granting service (keydistributioncenter). Kerberos is also more secure than theolderNTLM protocol.

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Then, what is NTLM authentication?

In a Windows network, NT (New Technology) LANManager(NTLM) is a suite of Microsoft security protocolsintendedto provide authentication, integrity, andconfidentiality tousers. NTLM is the successor to theauthenticationprotocol in Microsoft LAN Manager (LANMAN), anolder Microsoftproduct.

Secondly, how does negotiate authentication work? Negotiate is a MicrosoftWindowsauthentication mechanism that uses Kerberos asitsunderlying authentication provider. Kerberos worksona ticket granting system for authenticating users to resources,andinvolves a client, server, and a Key Distribution Center,orKDC.

Likewise, people ask, what is Kerberos authentication?

ːrb?r?s/) isacomputer-network authentication protocol that works onthebasis of tickets to allow nodes communicating over anon-securenetwork to prove their identity to one another in asecure manner.Kerberos uses UDP port 88 bydefault.

Where is Kerberos used?

Kerberos is used heavily on secure systemswhichrequire solid auditing and authentication features. Itsusedin Posix authentication, as an alternativeauthentication systemfor ssh, POP and SMTP, in Active Directory,NFS, Samba, and quite afew other similar projects.

Related Question Answers

Dominque Catoira

Professional

How do I set up NTLM authentication?

Join the CloudGen Firewall to the NTLM domain asanauthorized host.
  1. Go to USERS > External Authentication.
  2. Click the NTLM tab.
  3. Enter the Windows Domain Username.
  4. Enter the Windows Domain Password.
  5. Click Save.
  6. Click Join Domain.

Jodee Zhinkin

Professional

How do I configure NTLM authentication?

How to Configure NTLM Authentication
  1. Configure NTLM Authentication. Go to USERS >ExternalAuthentication. Click the NTLM tab. Enter the NTLM/Kerberosrealmname in the Domain Realm field.
  2. Join the Firewall to the Domain. Join the CloudGen Firewalltothe NTLM domain as an authorized host. Go to USERS >ExternalAuthentication. Click the NTLM tab.

Loinaz Bermudo

Professional

What port does NTLM use?

NT LAN Manager (NTLM) is thedefaultauthentication scheme used by the WinLogon process; itusesthree ports between the client and domaincontroller (DC):UDP 137 - UDP 137 (NetBIOS Name) UDP 138 - UDP 138(NetBIOSNetlogon and Browsing) 1024-65535/TCP - TCP 139(NetBIOSSession)

Yissel Eirih

Explainer

Is Ntlm still used?

The Microsoft Kerberos security package addsgreatersecurity than NTLM to systems on a network.AlthoughMicrosoft Kerberos is the protocol of choice, NTLMisstill supported. NTLM must also be usedforlogon authentication on stand-alone systems.

Maiol Ferez

Explainer

Can I disable NTLM?

This policy allows us to allow or disableNTLMauthentication within the domain. Disable: Thisdisables thepolicy, and allows NTLM authentication withinthe domain.Deny for domain servers: The domain controllerwill denyNTLM authentication requests to all serversin the domainand return an NTLM blocked error.

Liyu Issad

Explainer

Does LDAP use NTLM?

NTLM Authentication module uses asimpleLDAP connection to Windows Active Directory forfurtherauthentication. The module is aimed at those who wantLDAPAuthentication with the option of NTLM, but alsorequiresomething easier and simple to use that will workwithWindows Domain Controllers.

Ondiz Godinghaus

Pundit

What is LDAP authentication?

LDAP user authentication is the processofvalidating a username and password combination with adirectoryserver such MS Active Directory, OpenLDAP or OpenDJ.LDAPdirectories are standard technology for storaging user,group andpermission information and serving that to applications intheenterprise.

Hikmat Pueschel

Pundit

Is NTLM authentication secure?

The Security Risks of NTLM: ProceedwithCaution. NTLM (NT LAN Manager) is Microsoft'soldauthentication protocol that was replaced withKerberosstarting Windows 2000. The challenge with havingNTLM inyour network is that it is easily exploitable andputs anorganization at risk for a breach.

Zornitsa Tosca

Pundit

What are the 3 main parts of Kerberos?

Kerberos runs as a third-party trustedserverknown as the Key Distribution Center (KDC). Each userandservice on the network is a principal. The KDC hasthreemain components: An authentication server that performstheinitial authentication and issues ticket-granting ticketsforusers.

Hamido Cernadas

Pundit

Why Kerberos authentication is used?

The primary advantage of Kerberos is theabilityto use strong encryption algorithms to protect passwordsandauthentication tickets.

Estevan Jarmukhamedov

Pundit

How long is a Kerberos ticket valid?

By default, a ticket is valid for 10hoursin Active Directory but this can be changed bytheadmin.

Nordine Raubach

Teacher

Does Kerberos use certificates?

While Kerberos and SSL are bothprotocols,Kerberos is an authentication protocol, but SSL isanencryption protocol. Kerberos uses UDP, SSLuses(most of the time) TCP. Windows uses Kerberos forexample,when used in domain. Related note: Recent versions of SSLarecalled TLS for Transport Layer Security.

Shakia Dogadkin

Teacher

What is Kerberos authentication and how does it work?

Under Kerberos, a client (generally either auseror a service) sends a request for a ticket to the KeyDistributionCenter (KDC). The KDC creates a ticket-granting ticket(TGT) forthe client, encrypts it using the client's password as thekey, andsends the encrypted TGT back to the client.

Cristinel Arquelladas

Teacher

What is the difference between Kerberos and LDAP?

Short answer: LDAP is a protocol foraccessingdirectories (like OpenLDAP, or Active Directory). As partof itsfunction, it has the ability to authenticate a connectionusing ausername and password. Kerberos is an authenticationandsingle sign-on protocol.

Antera Shraddha

Teacher

Does Kerberos require Active Directory?

The Kerberos Key Distribution Center(KDC)is integrated with other Windows Server securityservicesthat run on the domain controller. Active DirectoryDomainServices is required for defaultKerberosimplementations within the domain orforest.

Mankilef Semrow

Reviewer

What is IPsec and how it works?

In computing, Internet Protocol Security(IPsec)is a secure network protocol suite that authenticatesand encryptsthe packets of data sent over an Internet Protocolnetwork.Internet Protocol security (IPsec) usescryptographicsecurity services to protect communications overInternet Protocol(IP) networks.

Mbarka Vardanyan

Reviewer

What is the function of Kerberos?

The only function of Kerberos is to providethesecure authentication of users and servers on the network. Itdoesnot provide authorization or auditing functions. Itisrecommended that Kerberos be used with othersecuritymethods which provide authorization andauditservices.

Kristian Laquidain

Reviewer

What makes a good authentication scheme and why?

Authentication is important because itenablesorganizations to keep their networks secure by permittingonlyauthenticated users (or processes) to access itsprotectedresources, which may include computer systems, networks,databases,websites and other network-based applicationsorservices.

Arsalan Recio

Reviewer

How does NTLM authentication work?

NTLM credentials are based on data obtainedduringthe interactive logon process and consist of a domain name,a username, and a one-way hash of the user's password. NTLMuses anencrypted challenge/response protocol toauthenticate a userwithout sending the user's password overthe wire.