GSEC Cryptography Practice Question
An organization is migrating to a cloud environment and must ensure that data remains encrypted while in use by applications. Which technology should the security team implement to achieve this?
⚠ Common exam trap
Candidates frequently choose 'TLS' or 'AES encryption,' forgetting that these protect data in transit or at rest, but fail to address the 'in-use' (processing) requirement.
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
✓
Homomorphic Encryption
Homomorphic encryption is a sophisticated cryptographic technique that allows computations to be performed on encrypted data without first needing to decrypt it. This ensures that the data is never exposed in cleartext within the application's memory or on the cloud provider's host, effectively providing security for data-in-use. This is a powerful, though performance-intensive, solution for highly regulated industries like finance or healthcare that require data protection even during processing in untrusted environments.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Transport Layer Security (TLS)
Why it's wrong here
TLS is designed to protect data while it is in transit over a network. It does not provide protection for data in use on a server, as the data must be decrypted by the application before it can be processed. Therefore, it is insufficient for protecting data-in-use scenarios.
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Full Disk Encryption (FDE)
Why it's wrong here
FDE protects data while it is at rest on a physical or virtual disk. Once the system is booted and the volume is mounted, the data is decrypted for the OS. FDE does not protect data from being accessed or modified by unauthorized processes running on the live system.
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Homomorphic Encryption
Why this is correct
Homomorphic encryption allows mathematical operations to be performed directly on ciphertext. The result of the operation, when decrypted, matches the result that would have been obtained if the operations were performed on the original plaintext, providing a unique method for keeping data secure while it is being actively processed.
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Database Transparent Data Encryption
Why it's wrong here
Transparent Data Encryption (TDE) is a form of at-rest encryption that secures database files on disk. It does not offer protection against unauthorized access to the data while the database engine is running and processing queries, as the engine handles the decryption transparently for the calling application.
About these practice questions
This GSEC question is part of Courseiva's 351-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official GIAC exam blueprint
This GSEC practice question is part of Courseiva's free GIAC 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 GSEC exam.