mediumMultiple ChoiceObjective-mapped
Secure Credential Storage for CompTIA SecurityX / CASP+
A security engineer is writing a Python script to automate the revocation of compromised credentials across multiple cloud services. Which of the following is the most critical security consideration when implementing this script?
Quick Answer
The correct answer is to use a secrets management service to store API keys, as this directly addresses the most critical security consideration for secure credential storage in automation scripts. Hardcoding credentials in source code or configuration files creates an unacceptable risk of exposure through version control, logs, or debug output, whereas a dedicated secrets manager like HashiCorp Vault or AWS Secrets Manager encrypts the keys at rest and in transit, enforces least-privilege access policies, and supports automated rotation—essential for a multi-cloud revocation script where a single compromised key could cascade across services. On the CompTIA SecurityX CAS-004 exam, this scenario tests your understanding of credential management in DevSecOps pipelines, often appearing as a trap where candidates choose “least privilege” alone, forgetting that even a limited key is dangerous if stored in plaintext. Remember the mnemonic: “Secrets never sleep in scripts”—always vault them, never embed them.
⚠ Common exam trap
The CAS-004 exam often tests the misconception that least privilege (Option A) is the most critical control, but the trap here is that without secure credential storage, even a least-privilege key can be exfiltrated and reused, making secrets management the foundational security consideration for automation scripts.
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
✓
Use a secrets management service to store API keys.
Storing API keys in a secrets management service (e.g., HashiCorp Vault, AWS Secrets Manager) prevents hardcoding credentials in the script, which is a critical security practice for automation. Even with least privilege, if the API key is exposed in plaintext (e.g., in source code or logs), an attacker can reuse it across services. Secrets management also enables rotation, auditing, and dynamic access control, directly addressing the risk of credential compromise in multi-cloud revocation scripts.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ensure the script runs with the least privilege necessary.
Why it's wrong here
Important but not the most critical; the script's credentials must be protected first.
- ✗
Log all actions performed by the script.
Why it's wrong here
Logging is good for auditing but does not protect the script's credentials.
- ✗
Run the script from a hardened bastion host.
Why it's wrong here
While a hardened host reduces risk, the script's secrets are still exposed if hardcoded.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CAS-005 exam frequently reuses these exact scenarios with slightly different constraints.
✓Use a secrets management service to store API keys.Correct answer▾
✗Ensure the script runs with the least privilege necessary.Wrong answer — click to see why▾
Why this is wrong here
Important but not the most critical; the script's credentials must be protected first.
✗Log all actions performed by the script.Wrong answer — click to see why▾
Why this is wrong here
Logging is good for auditing but does not protect the script's credentials.
✗Run the script from a hardened bastion host.Wrong answer — click to see why▾
Why this is wrong here
While a hardened host reduces risk, the script's secrets are still exposed if hardcoded.
Analysis generated from the official CAS-005blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
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Same concept, more angles
1 more way this is tested on CAS-005
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A security engineer is writing a Python script to automate the revocation of compromised certificates using the ACME protocol. The script uses the `acme` library and requires secure credential storage. Which method is MOST appropriate for storing the ACME account private key used for authentication?
hard- ✓ A.Store the key in the operating system's keychain (e.g., macOS Keychain, Windows Credential Manager) or a HSM
- B.Store the key in a configuration file with 600 permissions
- C.Embed the key directly in the script as a string variable
- D.Store the key in an environment variable
Why A: The ACME account private key is a highly sensitive cryptographic credential used to authenticate against the ACME server (RFC 8555). Storing it in the OS keychain or a Hardware Security Module (HSM) provides encryption at rest, access control via OS-level permissions, and protection against accidental exposure. This aligns with the principle of least privilege and secure key management required for automation scripts handling certificate revocation.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.