- A
Avalanche effect
Why wrong: The avalanche effect refers to a small change in input causing a drastic change in output. While important for hash functions, it is not the property directly relied upon for integrity verification using a provided hash.
- B
Collision resistance
Why wrong: Collision resistance ensures that it is hard to find any two different inputs that hash to the same value. However, in this scenario, the attacker is given the original hash and must find a different file with that hash, which is second pre-image resistance. Collision resistance is a stronger property but not specifically required.
- C
Second pre-image resistance
Second pre-image resistance is correct. Given the provided SHA-256 hash of the original file, the property ensures that an attacker cannot find a different file that produces the same hash, thus verifying integrity.
- D
Pre-image resistance
Why wrong: Pre-image resistance ensures that given a hash, it is hard to find any input that produces it. However, in this scenario, the analyst already has the original file's hash and is comparing computed hash to that. Pre-image resistance is about reversing the hash, not about finding a different input with the same hash. Second pre-image resistance is the correct property.
SSCP Second pre-image resistance Practice Question
This SSCP practice question tests your understanding of second pre-image resistance. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: second pre-image resistance. 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.
A security analyst needs to verify that a downloaded file has not been tampered with. The publisher provides a SHA-256 hash. Which property of the hash function is being relied upon?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Second pre-image resistance
When relying on a provided hash to verify file integrity, the security analyst is using second pre-image resistance. This property ensures that given a hash value (the original file's hash), it is computationally infeasible to find another input (a tampered file) that produces the same hash. Thus, if the computed hash matches the provided hash, the file is authentic and unchanged. Collision resistance is a stronger property but not directly required here; second pre-image resistance is the exact requirement for this scenario.
Key principle: Second pre-image resistance
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Avalanche effect
Why it's wrong here
The avalanche effect refers to a small change in input causing a drastic change in output. While important for hash functions, it is not the property directly relied upon for integrity verification using a provided hash.
- ✗
Collision resistance
Why it's wrong here
Collision resistance ensures that it is hard to find any two different inputs that hash to the same value. However, in this scenario, the attacker is given the original hash and must find a different file with that hash, which is second pre-image resistance. Collision resistance is a stronger property but not specifically required.
- ✓
Second pre-image resistance
Why this is correct
Second pre-image resistance is correct. Given the provided SHA-256 hash of the original file, the property ensures that an attacker cannot find a different file that produces the same hash, thus verifying integrity.
Related concept
Second pre-image resistance
- ✗
Pre-image resistance
Why it's wrong here
Pre-image resistance ensures that given a hash, it is hard to find any input that produces it. However, in this scenario, the analyst already has the original file's hash and is comparing computed hash to that. Pre-image resistance is about reversing the hash, not about finding a different input with the same hash. Second pre-image resistance is the correct property.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often incorrectly choose collision resistance because it is commonly associated with hash functions. However, the specific scenario of verifying a known hash relies on second pre-image resistance, not collision resistance. Collision resistance prevents finding any two inputs with the same hash, but here the attacker is given the hash of the original and must find a different input with that same hash, which is second pre-image resistance.
Trap categories for this question
Command / output trap
The avalanche effect refers to a small change in input causing a drastic change in output. While important for hash functions, it is not the property directly relied upon for integrity verification using a provided hash.
Scenario analysis trap
Collision resistance ensures that it is hard to find any two different inputs that hash to the same value. However, in this scenario, the attacker is given the original hash and must find a different file with that hash, which is second pre-image resistance. Collision resistance is a stronger property but not specifically required.
Detailed technical explanation
How to think about this question
Collision resistance is formally defined as the infeasibility of finding any two distinct inputs x and y such that H(x) = H(y). For SHA-256, the birthday attack bound is 2^128 operations, making collisions practically impossible with current computing power. In real-world scenarios, collision resistance is critical for digital signatures and certificate transparency logs, where an attacker could forge a signature by creating a collision with a benign document.
KKey Concepts to Remember
- Second pre-image resistance
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Second pre-image resistance
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Second pre-image resistance Security exam questions test whether you can match controls to threats in context — not just recall definitions.
What to study next
Got this wrong? Here's your next step.
Review second pre-image resistance, then practise related SSCP questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SSCP question test?
Second pre-image resistance
What is the correct answer to this question?
The correct answer is: Second pre-image resistance — When relying on a provided hash to verify file integrity, the security analyst is using second pre-image resistance. This property ensures that given a hash value (the original file's hash), it is computationally infeasible to find another input (a tampered file) that produces the same hash. Thus, if the computed hash matches the provided hash, the file is authentic and unchanged. Collision resistance is a stronger property but not directly required here; second pre-image resistance is the exact requirement for this scenario.
What should I do if I get this SSCP question wrong?
Review second pre-image resistance, then practise related SSCP questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Second pre-image resistance
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Last reviewed: Jun 25, 2026
This SSCP practice question is part of Courseiva's free ISC2 certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SSCP exam.
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