The correct answer is to store encryption keys in a centralized KMS or HSM and use distinct keys with rotation. This approach directly reduces the impact of a compromised backup server by ensuring that a breach of one server only exposes the data encrypted with that specific key, rather than granting access to all backup data across the environment. Centralized key management isolates the blast radius, while key rotation limits the window of exposure by invalidating older keys. On the Security+ SY0-701 exam, this concept tests your understanding of cryptographic isolation and the principle of least privilege applied to key storage—a common trap is choosing a shared key file for simplicity, which creates a single point of failure. Remember the memory tip: “One key, one server, one breach; rotate to keep exposure out of reach.”
SY0-701 General Security Concepts Practice Question
This SY0-701 practice question tests your understanding of general security concepts. 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.
Exhibit
backup.sh excerpt:
```
openssl enc -aes-256-cbc -in finance.tar -out finance.tar.enc -kfile /opt/backup/finance.key
chmod 600 /opt/backup/finance.key
# same key file copied to all backup servers
```
Backup administrator note:
- All sites use the same encryption key so restores are simple.
- The key file is stored on the local backup server.
Based on the exhibit, what is the best improvement to reduce the impact if one backup server is compromised?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
backup.sh excerpt:
```
openssl enc -aes-256-cbc -in finance.tar -out finance.tar.enc -kfile /opt/backup/finance.key
chmod 600 /opt/backup/finance.key
# same key file copied to all backup servers
```
Backup administrator note:
- All sites use the same encryption key so restores are simple.
- The key file is stored on the local backup server.
A
Keep the same key file but rename it so attackers cannot find it easily.
Why wrong: Renaming a key file does not protect the secret. If the server is compromised, the attacker can still inspect processes, files, and permissions to locate and use it.
B
Replace AES with SHA-256 so the backups are harder to read.
Why wrong: SHA-256 is a hash function, not a file encryption method. It cannot be used to decrypt and restore backup data, so it does not solve the problem.
C
Store encryption keys in a centralized KMS or HSM and use distinct keys with rotation.
This is the best improvement because the current design places the same key on every backup server, creating a large blast radius if one host is compromised. Centralized key management through a KMS or HSM improves control, auditing, rotation, and separation of duties. Distinct keys also limit how much data exposure results from one server compromise.
D
Email the key file to backup operators so they can restore data quickly.
Why wrong: Emailing a key file creates additional copies in an insecure channel and expands exposure. It also weakens confidentiality and makes auditing key access much harder.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Store encryption keys in a centralized KMS or HSM and use distinct keys with rotation.
Option C is correct because using a centralized Key Management System (KMS) or Hardware Security Module (HSM) with distinct, rotated keys ensures that compromising one backup server does not expose the encryption keys for all backups. This isolates the impact to only the data encrypted with that specific key, and key rotation further limits the window of exposure. In contrast, sharing a single key file across servers creates a single point of failure, as compromising one server reveals the key for all backups.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Keep the same key file but rename it so attackers cannot find it easily.
Why it's wrong here
Renaming a key file does not protect the secret. If the server is compromised, the attacker can still inspect processes, files, and permissions to locate and use it.
✗
Replace AES with SHA-256 so the backups are harder to read.
Why it's wrong here
SHA-256 is a hash function, not a file encryption method. It cannot be used to decrypt and restore backup data, so it does not solve the problem.
✓
Store encryption keys in a centralized KMS or HSM and use distinct keys with rotation.
Why this is correct
This is the best improvement because the current design places the same key on every backup server, creating a large blast radius if one host is compromised. Centralized key management through a KMS or HSM improves control, auditing, rotation, and separation of duties. Distinct keys also limit how much data exposure results from one server compromise.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Email the key file to backup operators so they can restore data quickly.
Why it's wrong here
Emailing a key file creates additional copies in an insecure channel and expands exposure. It also weakens confidentiality and makes auditing key access much harder.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think renaming or hiding the key file (Option A) is a valid security measure, but CompTIA tests the principle that security through obscurity (hiding files) is not a substitute for proper key management and isolation.
Detailed technical explanation
How to think about this question
A KMS centralizes key lifecycle management, including generation, rotation, and deletion, often using hardware-backed security (HSM) to protect keys in tamper-resistant hardware. In practice, distinct keys per backup server mean that even if an attacker gains root access to one server, they only decrypt that server's backups, not the entire backup infrastructure. Key rotation (e.g., every 90 days or after a breach) further reduces the impact by ensuring that older backups are encrypted with keys that are no longer valid, limiting the attacker's window of access.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
General Security Concepts — This question tests General Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Store encryption keys in a centralized KMS or HSM and use distinct keys with rotation. — Option C is correct because using a centralized Key Management System (KMS) or Hardware Security Module (HSM) with distinct, rotated keys ensures that compromising one backup server does not expose the encryption keys for all backups. This isolates the impact to only the data encrypted with that specific key, and key rotation further limits the window of exposure. In contrast, sharing a single key file across servers creates a single point of failure, as compromising one server reveals the key for all backups.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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