The answer is to encrypt the file with headquarters’ public key. This method is correct because public key encryption for confidentiality relies on the mathematical relationship between a public key, which can be freely shared, and a private key, which is kept secret. By encrypting the design document with headquarters’ public key, only the holder of the corresponding private key—headquarters—can decrypt it, ensuring confidentiality over an untrusted network without ever needing to pre-share a secret key. On the Security+ SY0-701 exam, this scenario tests your understanding of asymmetric encryption’s core purpose: providing confidentiality without prior key exchange. A common trap is confusing this with digital signatures, which use the sender’s private key for authentication, not confidentiality. Remember the memory tip: “Public to protect, private to peek”—the public key locks the file, the private key unlocks it.
SY0-701 General Security Concepts Practice Question
This SY0-701 practice question tests your understanding of general security concepts. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 branch office needs to send a confidential design document to headquarters over an untrusted network. Headquarters already has the public/private key pair available for document exchange. Which method is most appropriate to keep the file confidential during transit without first sharing a secret key?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Encrypt the file with headquarters' public key
Encrypting the file with headquarters' public key ensures that only headquarters, possessing the corresponding private key, can decrypt and read the file. This method provides confidentiality over an untrusted network without requiring a pre-shared secret key, as the public key can be freely distributed.
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.
✓
Encrypt the file with headquarters' public key
Why this is correct
Only headquarters can decrypt the file with its matching private key, preserving confidentiality in transit.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Publish a hash of the file for comparison
Why it's wrong here
A hash can verify integrity, but it does not encrypt the document or protect confidentiality.
✗
Sign the file with the branch office private key only
Why it's wrong here
A signature proves origin and integrity, but it does not keep the contents secret from eavesdroppers.
✗
Compress the file before sending it
Why it's wrong here
Compression changes size and format, but it does not provide any cryptographic protection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse digital signatures (which provide authentication and integrity) with encryption (which provides confidentiality), leading them to choose signing the file instead of encrypting it.
Detailed technical explanation
How to think about this question
This uses asymmetric encryption, typically with RSA or ECC algorithms, where the public key encrypts a symmetric session key (e.g., AES-256) that then encrypts the file. In practice, hybrid encryption is used because asymmetric encryption is computationally expensive for large files; the file is encrypted with a symmetric key, and that key is encrypted with the recipient's public key.
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: Encrypt the file with headquarters' public key — Encrypting the file with headquarters' public key ensures that only headquarters, possessing the corresponding private key, can decrypt and read the file. This method provides confidentiality over an untrusted network without requiring a pre-shared secret key, as the public key can be freely distributed.
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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SY0-701 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 SY0-701 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.