The answer is digital signature. This cryptographic mechanism is the correct choice because it provides both non-repudiation and integrity for contract signing, ensuring the signer cannot later deny their action and that the document has not been altered after signing. It works by using asymmetric cryptography: the signer’s private key creates a unique signature tied to both the signer’s identity and the content, while the public key allows anyone to verify that the signature matches the original file. On the Security+ SY0-701 exam, this concept tests your understanding of how digital signatures fulfill legal requirements for proof of origin and tamper detection, often appearing in scenario-based questions about contracts or legal documents. A common trap is confusing digital signatures with hashing alone—hashing provides integrity but not non-repudiation, since it lacks the private key binding to a specific signer. Remember the mnemonic: “Sign with private, verify with public—non-repudiation and integrity in one cryptographic function.”
SY0-701 General Security Concepts Practice Question
This SY0-701 practice question tests your understanding of general security concepts. 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 legal department needs a contract file that can later prove who signed it and whether the content changed after signing. Which cryptographic mechanism should be used?
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 non-repudiation, ensuring the signer cannot deny signing the document, and integrity, detecting any changes after signing. It uses asymmetric cryptography where the signer's private key creates the signature, and the public key verifies it, making it the correct choice for proving both identity and content integrity.
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
Digital signatures provide tamper detection and signer validation using asymmetric cryptography.
Related concept
Read the scenario before looking for a memorised answer.
✗
Symmetric encryption
Why it's wrong here
Symmetric encryption hides content but does not identify the signer or prove document integrity alone.
✗
Hashing
Why it's wrong here
Hashing can detect changes, but it cannot bind the document to a specific signer.
✗
Tokenization
Why it's wrong here
Tokenization replaces data values, which is useful for privacy but not for signature validation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse hashing (which provides integrity) with digital signatures (which provide both integrity and non-repudiation), leading them to pick hashing when the question explicitly requires proof of who signed it.
Detailed technical explanation
How to think about this question
Digital signatures typically use algorithms like RSA (PKCS#1 v1.5 or PSS) or ECDSA (FIPS 186-5). The signer computes a hash of the document (e.g., SHA-256) and encrypts that hash with their private key; verification involves decrypting with the public key and comparing hashes. In real-world scenarios, a signed PDF using PKCS#7/CMS signatures embeds the signature in the file, allowing later verification even if the file is moved or stored.
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: Digital signature — A digital signature provides non-repudiation, ensuring the signer cannot deny signing the document, and integrity, detecting any changes after signing. It uses asymmetric cryptography where the signer's private key creates the signature, and the public key verifies it, making it the correct choice for proving both identity and content integrity.
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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Question Discussion
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