- A
Digital signature
Correct. A digital signature uses the vendor's private key to sign the update, and customers can verify it with the vendor's public key. This provides both source authentication and integrity.
- B
Cryptographic hash
Why wrong: Incorrect. A cryptographic hash (e.g., SHA-256) ensures integrity but does not provide authentication. An attacker could replace the file and the hash simultaneously, so alone it does not prove the source.
- C
Antivirus scan report
Why wrong: Incorrect. An antivirus scan report only indicates whether known malware is present. It does not cryptographically verify the file's origin or integrity.
- D
TLS certificate
Why wrong: Incorrect. TLS protects data in transit between the website and the downloader, but it does not provide a persistent, verifiable property for the file itself after download. A TLS certificate authenticates the server, not the individual file.
Quick Answer
The answer is a digital signature, because it uniquely provides both authentication and integrity in a single cryptographic technique. When the vendor signs the update file with their private key, any subsequent verification with the corresponding public key confirms the file’s origin and detects any tampering, since a modified file would cause signature verification to fail. On the Security+ SY0-701 exam, this concept tests your understanding of how digital signatures differ from hashing alone—hashing provides integrity but no authentication, which is a common trap. Remember that a digital signature is essentially an encrypted hash, combining the non-repudiation of asymmetric encryption with the tamper-detection of a hash. For a quick memory tip: think “sign to prove who, hash to prove whole”—a digital signature proves the sender’s identity and the file’s wholeness, while a hash alone only proves the file hasn’t changed.
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.
A software vendor distributes critical security updates for its application through a public download website. The vendor wants to allow customers to verify that each update originated from the vendor and has not been modified in transit. Which of the following cryptographic techniques should the vendor apply to the update files before posting them for download?
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
Digital signature
A digital signature provides both authentication (proving the update originated from the vendor) and integrity (detecting any modification in transit). The vendor signs the file with their private key, and customers verify the signature using the vendor's public key, ensuring the file has not been altered since signing.
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.
- ✓
Digital signature
Why this is correct
Correct. A digital signature uses the vendor's private key to sign the update, and customers can verify it with the vendor's public key. This provides both source authentication and integrity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Cryptographic hash
Why it's wrong here
Incorrect. A cryptographic hash (e.g., SHA-256) ensures integrity but does not provide authentication. An attacker could replace the file and the hash simultaneously, so alone it does not prove the source.
- ✗
Antivirus scan report
Why it's wrong here
Incorrect. An antivirus scan report only indicates whether known malware is present. It does not cryptographically verify the file's origin or integrity.
- ✗
TLS certificate
Why it's wrong here
Incorrect. TLS protects data in transit between the website and the downloader, but it does not provide a persistent, verifiable property for the file itself after download. A TLS certificate authenticates the server, not the individual file.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse a cryptographic hash (which only ensures integrity) with a digital signature (which ensures both integrity and non-repudiation/authentication), or they mistakenly think TLS certificates alone can verify the file's origin after download.
Detailed technical explanation
How to think about this question
Digital signatures use asymmetric cryptography: the vendor creates a hash of the file, encrypts that hash with their private key (the signature), and distributes the file and signature. Customers decrypt the signature with the vendor's public key to retrieve the original hash, then recompute the file's hash and compare; if they match, the file is authentic and unmodified. This process is standardized in PKCS#1 and RFC 8017, and commonly implemented via tools like OpenSSL's `dgst -sign` and `dgst -verify`.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SY0-701 question test?
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: Digital signature — A digital signature provides both authentication (proving the update originated from the vendor) and integrity (detecting any modification in transit). The vendor signs the file with their private key, and customers verify the signature using the vendor's public key, ensuring the file has not been altered since signing.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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