The answer is Microsoft Purview Customer Key. This solution is correct because it enables organizations to provide and manage their own encryption keys using an on-premises hardware security module (HSM), ensuring that Microsoft cannot decrypt the data since the keys remain outside of Microsoft’s control. For the SC-900 exam, this scenario tests your understanding of data residency and encryption control within Microsoft Purview’s compliance solutions, often appearing as a trick question where candidates might confuse Customer Key with Customer Lockbox or Double Key Encryption. A common trap is assuming Double Key Encryption is the answer, but that solution keeps one key with Microsoft and one with the customer, whereas Customer Key allows full on-premises key management. Remember the memory tip: “Customer Key = Customer Keeps Keys on-premises,” which directly maps to the requirement of protecting data even from Microsoft.
SC-900 Practice Question: Describe the capabilities of Microsoft compliance solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft compliance solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A government agency has extremely sensitive classified data that must be protected even from Microsoft. They require a solution where the encryption keys are stored and managed on-premises within their own hardware security module (HSM), ensuring that Microsoft cannot decrypt their data. Which Microsoft Purview solution should they implement?
Correct. Customer Key allows the customer to hold their own encryption keys, ensuring Microsoft cannot decrypt the data.
B
Microsoft Purview Data Lifecycle Management
Why wrong: Data Lifecycle Management manages retention and deletion policies, not encryption key ownership.
C
Microsoft Purview Information Protection
Why wrong: Information Protection applies labels and encryption using Microsoft-managed keys unless Customer Key is used; it does not by itself prevent Microsoft from accessing keys.
D
Microsoft Purview Communication Compliance
Why wrong: Communication Compliance monitors communications for policy violations, not encryption key management.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Purview Customer Key
Microsoft Purview Customer Key is the correct solution because it allows customers to provide and manage their own encryption keys using a hardware security module (HSM) on-premises. This ensures that Microsoft cannot access the encrypted data, as the keys are stored outside of Microsoft's control, meeting the requirement for protecting classified data even from Microsoft.
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.
✓
Microsoft Purview Customer Key
Why this is correct
Correct. Customer Key allows the customer to hold their own encryption keys, ensuring Microsoft cannot decrypt the data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Purview Data Lifecycle Management
Why it's wrong here
Data Lifecycle Management manages retention and deletion policies, not encryption key ownership.
✗
Microsoft Purview Information Protection
Why it's wrong here
Information Protection applies labels and encryption using Microsoft-managed keys unless Customer Key is used; it does not by itself prevent Microsoft from accessing keys.
✗
Microsoft Purview Communication Compliance
Why it's wrong here
Communication Compliance monitors communications for policy violations, not encryption key management.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft Purview Information Protection (which handles data classification and labeling) with encryption key management, but Information Protection does not provide customer-controlled keys stored on-premises to prevent Microsoft from decrypting data.
Detailed technical explanation
How to think about this question
Customer Key leverages Azure Key Vault and Azure Dedicated HSM to allow customers to generate and store encryption keys in their own on-premises HSM, which are then used to encrypt data at rest in Microsoft 365 services like Exchange Online and SharePoint Online. The key hierarchy involves a top-level key (TLK) managed by the customer, which encrypts the tenant key, ensuring that Microsoft's internal processes cannot decrypt the data without the customer's explicit key. A real-world scenario is a government agency handling classified intelligence that must comply with regulations like FedRAMP High or ITAR, where even Microsoft's engineering access must be blocked.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 question in full detail.
Describe the capabilities of Microsoft compliance solutions — This question tests Describe the capabilities of Microsoft compliance solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Purview Customer Key — Microsoft Purview Customer Key is the correct solution because it allows customers to provide and manage their own encryption keys using a hardware security module (HSM) on-premises. This ensures that Microsoft cannot access the encrypted data, as the keys are stored outside of Microsoft's control, meeting the requirement for protecting classified data even from Microsoft.
What should I do if I get this SC-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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