Why Were 14-Character Passwords Cracked So Quickly?

Windows Forensics

Answer Correct answer: A — Windows LAN Manager hashing splits a password of up to 14 characters into two separate 7-character hashes, so each half can be cracked quickly.

You are the network administrator for a small bank in Dallas, Texas. To ensure network security, you enact a security policy that requires all users to have 14 character passwords. After giving your users 2 weeks notice, you change the Group Policy to force 14 character passwords. A week later you dump the SAM database from the standalone server and run a password-cracking tool against it. Over 99% of the passwords are broken within an hour. Why were these passwords cracked so Quickly?

Passwords of 14 characters or less are broken up into two 7-character hashes Correct Answer
A password Group Policy change takes at least 3 weeks to completely replicate throughout a network
Networks using Active Directory never use SAM databases so the SAM database pulled was empty
The passwords that were cracked are local accounts on the Domain Controller

Community Votes

100%

100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Community Insight

It tests the LM hash 7-and-7 weakness in Windows SAM password storage, and the trap is assuming password length alone defeats cracking without checking the hash format.

The question tests why a 14-character Windows password policy did not prevent rapid SAM-database cracking. The answer is A: legacy LAN Manager hashing stored the password as two 7-character halves, making each half far easier to brute-force.

The most common wrong answer is D, assuming local accounts on a Domain Controller caused weak passwords, but the stem specifies a standalone server and the real issue is LM hash storage.

Community Discussion (5 comments)

044f354 👍 3 Selected: A

A. Passwords of 14 characters or less are broken up into two 7-character hashes: Correct Windows' LAN Manager (LM) hashing splits passwords into two 7-character blocks, making them easier to crack with brute force or rainbow table attacks.

Rodine 👍 4

Correct Answer: A. Passwords of 14 characters or less are broken up into two 7-character hashes Explanation: On Windows systems, passwords of 14 characters or less are split into two separate 7-character hashes when stored using the LAN Manager (LM) hash algorithm, which is an outdated and less secure hashing method. Here’s why this matters:

Toni222 👍 4 Selected: A

The most plausible reason the passwords were cracked so quickly is related to the way Windows stores and handles passwords, particularly with older hashing methods like LAN Manager (LM) hashes. LM hashes are known to split passwords into two 7-character chunks and hash them separately, which makes them much easier to crack than a single 14-character hash

Dumas 👍 4

A is the correct answer. No domain controller in this question. Domain Controllers don't keep passwords in the SAM file. This is all about LM an NTLM passwords. The weakness is called 7 & 7.

Jashan_lefty 👍 1 Selected: D

The passwords were cracked quickly because they were local accounts on the Domain Controller, which typically have weaker security measures compared to domain accounts.

Comments & Corrections

No comments yet — spotted an error or have a note? Share it below.

Expert Analysis

Why the Answer Is Correct

A is correct because the scenario points to legacy Windows LAN Manager password storage, where a password of up to 14 characters is effectively split into two 7-character halves. Each half is hashed separately, so a 14-character password does not create one large 14-character cracking problem; it creates two much smaller 7-character problems. After dumping the SAM database from the standalone server, a cracking tool can attack those halves with brute force or rainbow tables and recover most of them quickly. The policy change increased length, but it did not remove the underlying LM hash weakness in the exam's legacy Windows context.

Why the Other Options Are Wrong

B is wrong because the stem already gave users two weeks' notice and then waited a week after the Group Policy change; more importantly, a standalone server applies local policy and does not depend on domain-wide replication. C is wrong because Active Directory environments can still include member servers and standalone systems that use SAM for local accounts, and the scenario explicitly involves a standalone server. D is wrong because the stem does not describe a Domain Controller; it describes a standalone server, so local accounts on a Domain Controller are not the cause. The rapid cracking is explained by the hash-splitting weakness, not by slow policy replication or an empty SAM file.

Community Comment Notes

Rodine and Toni222 both explain that LM hashing splits passwords into two 7-character chunks, which makes the cracking far faster than a single long hash would suggest. Dumas reinforces the scenario detail with "No domain controller in this question" and names the weakness "7 & 7", which directly supports option A. Jashan_lefty chose D by arguing that local accounts on a Domain Controller are weaker, but that reasoning does not fit the standalone-server wording and does not explain the 99% cracking rate within an hour.

Official Reference

https://learn.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/password-policy

Exam Strategy

When a stem emphasizes a long password and unusually fast cracking, check the hash algorithm before blaming policy replication. For Windows SAM questions, map 7-character halves to LM hashing and map Active Directory domain account storage to ntds.dit rather than SAM.

Frequently Asked Questions

Why does a 14-character Windows password become two 7-character LM hashes?

Legacy LM hashing splits or pads the password into two 7-character blocks and hashes each separately, so cracking works on two smaller spaces.

Does a standalone server use Group Policy and a SAM database for local accounts?

Yes; local Group Policy applies on the standalone server, and its SAM stores local account hashes, so domain replication timing is irrelevant.

More 312-49v10 FAQ →

Related Analysis

← Back to 312-49v10 Study Guide