Quick Answer
The answer is that the password is split into two 7-character halves. This is the primary weakness of LM hashes because the hash algorithm first converts the password to uppercase, pads or truncates it to exactly 14 characters, and then divides it into two independent 7-character blocks. Each block is hashed separately using DES as the key for a known constant, which means an attacker can brute-force each half individually, reducing the effective keyspace from 14 characters to two trivial 7-character challenges. On the CompTIA PenTest+ PT0-002 exam, this concept tests your understanding of legacy authentication flaws and why modern systems disable LM hashes; a common trap is assuming the weakness is simply case insensitivity or the 14-character limit, but the core vulnerability is the split. For a quick memory tip, remember “7 + 7 = broken” — two halves make cracking twice as easy.
This PT0-002 practice question tests your understanding of attacks and exploits. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
While performing a password audit, a tester finds that the hash of 'Password123' is stored in the LAN Manager (LM) hash format. What is the primary security weakness of LM hashes?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
The password is split into two 7-character halves
This reduces keyspace to two 7-character halves, easily brute-forced.
The hash is case-sensitive
Why wrong: LM is case-insensitive, making it weaker.
The hash is salted with a weak random value
Why wrong: LM hashes do not use salt.
The hash uses the MD4 hashing algorithm
Why wrong: LM uses DES, while NTLM uses MD4.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The password is split into two 7-character halves
The primary security weakness of LAN Manager (LM) hashes is that the password is converted to uppercase, padded or truncated to 14 characters, and then split into two 7-character halves. Each half is hashed independently using DES as the key for a known constant, which means an attacker can brute-force each 7-character half separately, drastically reducing the keyspace from 14 characters to two sets of 7 characters. This makes LM hashes extremely vulnerable to offline cracking, especially with modern tools like John the Ripper or Hashcat.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The password is split into two 7-character halves
Why this is correct
This reduces keyspace to two 7-character halves, easily brute-forced.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
The hash is case-sensitive
Why it's wrong here
LM is case-insensitive, making it weaker.
The hash is salted with a weak random value
Why it's wrong here
LM hashes do not use salt.
The hash uses the MD4 hashing algorithm
Why it's wrong here
LM uses DES, while NTLM uses MD4.
Common exam traps
The trap here is that candidates often confuse LM hashes with NTLM hashes, incorrectly associating the weakness with MD4 (which is used by NTLM) or salting, when the real vulnerability is the split into two 7-character halves that can be attacked independently.
Detailed technical explanation
Under the hood, the LM hash process takes the 14-character uppercased password, splits it into two 7-character blocks, and uses each block as a key to DES-encrypt the fixed string 'KGS!@#$%'. This means each half can be cracked independently, and because DES keys are only 56 bits, each half has only 2^56 possible keys — but in practice, since passwords are often alphanumeric, the effective keyspace is far smaller. In a real-world scenario, tools like Hashcat can crack both halves of an LM hash in seconds if the password is weak, and the lack of salting allows attackers to use precomputed rainbow tables (e.g., via Ophcrack) to instantly reverse the hash.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
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FAQ
Attacks and Exploits — This question tests Attacks and Exploits — Read the scenario before looking for a memorised answer..
The correct answer is: The password is split into two 7-character halves — The primary security weakness of LAN Manager (LM) hashes is that the password is converted to uppercase, padded or truncated to 14 characters, and then split into two 7-character halves. Each half is hashed independently using DES as the key for a known constant, which means an attacker can brute-force each 7-character half separately, drastically reducing the keyspace from 14 characters to two sets of 7 characters. This makes LM hashes extremely vulnerable to offline cracking, especially with modern tools like John the Ripper or Hashcat.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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