Authentication Protocols Win2K and later can use four authentication protocols: LAN Manager, NTLM, NTLMv2, and Kerberos. LAN Manager was the original protocol, and if LAN Manager authentication traffic is sniffed off the network, compromising the password is trivial. Microsoft released the NTLM protocol with NT, but that protocol was later found to contain flaws. Microsoft then developed NTLMv2 for Win2K. That version has withstood the test of time and has been ported back to NT and Windows 9x. Password crackers can't easily break NTLMv2 traffic.Win2K and later domain logons use the Kerberos protocol, which uses the NT hash and is fairly secure.
5. Force moderately frequent password changes. From Group Policy or Local Security Policy, navigate to Computer Configuration\Windows Settings\Security Settings\Local Policies\Password Policy and set the Maximum password age setting to no more than 90 days. Given enough time, any password guesser, cracker, or rainbow table can defeat any password. But if a password is at least 15 characters long and complex, it will take most attackers more than 90 days to crack it. Any reasonable interval can be argued; just don't make your users switch passwords too frequently, because then they'll start writing down their passwords.
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