A digital signature is an electronic method used to verify the authenticity and integrity of a digital document or message. It employs cryptographic algorithms, where the sender encrypts a hash of the document with their private key, creating a unique signature. The recipient can then decrypt this signature using the sender’s public key to confirm the document’s originality and the sender’s identity, ensuring it hasn’t been altered during transmission. This technology is essential for secure online transactions, email communications, and legal agreements, providing non-repudiation and enhancing trust in the digital world.
Table of contents
- Part 1: OnlineExamMaker AI quiz generator – The easiest way to make quizzes online
- Part 2: 20 digital signature quiz questions & answers
- Part 3: Automatically generate quiz questions using AI Question Generator
Part 1: OnlineExamMaker AI quiz generator – The easiest way to make quizzes online
When it comes to ease of creating a digital signature assessment, OnlineExamMaker is one of the best AI-powered quiz making software for your institutions or businesses. With its AI Question Generator, just upload a document or input keywords about your assessment topic, you can generate high-quality quiz questions on any topic, difficulty level, and format.
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Part 2: 20 digital signature quiz questions & answers
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1. Question: What is the primary purpose of a digital signature?
A. To encrypt data for secure transmission
B. To verify the integrity and authenticity of a message
C. To compress data for faster transfer
D. To hide data from unauthorized users
Answer: B
Explanation: A digital signature uses cryptographic techniques to ensure that the message has not been altered and that it comes from the claimed sender, providing integrity and authenticity.
2. Question: Which cryptographic algorithm is commonly used for digital signatures?
A. AES
B. RSA
C. DES
D. Blowfish
Answer: B
Explanation: RSA is a public-key cryptosystem that supports digital signatures by using a private key to sign and a public key to verify.
3. Question: In a digital signature process, what is the role of a hash function?
A. It encrypts the entire message
B. It creates a fixed-size string from the message for signing
C. It decrypts the signature
D. It generates random keys
Answer: B
Explanation: A hash function produces a unique digest of the message, which is then encrypted with the sender’s private key to create the signature, ensuring efficiency and integrity.
4. Question: What does non-repudiation mean in the context of digital signatures?
A. The ability to deny sending a message
B. The inability to deny sending a message after it has been signed
C. The process of encrypting data twice
D. The method of compressing signatures
Answer: B
Explanation: Non-repudiation ensures that the sender cannot later deny having signed the message, as the signature is uniquely linked to their private key.
5. Question: Which component is NOT typically part of a digital signature scheme?
A. Public key
B. Private key
C. Symmetric key
D. Hash function
Answer: C
Explanation: Digital signatures rely on asymmetric cryptography with public and private keys, along with a hash function, whereas symmetric keys are used in encryption, not signatures.
6. Question: How is a digital signature verified?
A. By decrypting the signature with the sender’s public key
B. By encrypting the message with the receiver’s private key
C. By hashing the signature directly
D. By using a symmetric key for decryption
Answer: A
Explanation: Verification involves decrypting the signature with the sender’s public key and comparing the resulting hash with a newly computed hash of the message.
7. Question: What is the main difference between a digital signature and an electronic signature?
A. Electronic signatures are always encrypted
B. Digital signatures use cryptography for verification
C. Electronic signatures are only used for emails
D. Digital signatures do not provide authenticity
Answer: B
Explanation: Digital signatures employ cryptographic methods to ensure security, while electronic signatures can be any digital form of a signature without necessarily using encryption.
8. Question: In PKI (Public Key Infrastructure), what is the function of a Certificate Authority (CA)?
A. To generate random hashes
B. To issue and verify digital certificates
C. To encrypt all network traffic
D. To revoke public keys
Answer: B
Explanation: A CA acts as a trusted third party that issues digital certificates, binding public keys to entities and facilitating trust in digital signatures.
9. Question: What happens if a digital signature is tampered with after signing?
A. The signature remains valid
B. Verification will fail due to mismatched hashes
C. The message will automatically encrypt itself
D. The private key will be exposed
Answer: B
Explanation: Any alteration to the signed message changes the hash, causing the verification process to detect the tampering and fail.
10. Question: Which standard is commonly used for digital signatures in email security?
A. SSL
B. S/MIME
C. HTTP
D. FTP
Answer: B
Explanation: S/MIME (Secure/Multipurpose Internet Mail Extensions) provides a standard way to add digital signatures and encryption to email messages.
11. Question: What is a key pair in digital signatures?
A. Two identical keys for encryption
B. A public key and a private key
C. A single key used for both signing and verifying
D. A set of revoked keys
Answer: B
Explanation: A key pair consists of a private key for signing and a public key for verification, forming the basis of asymmetric cryptography.
12. Question: Why is it important to keep the private key secret in digital signatures?
A. To prevent unauthorized encryption
B. To avoid forgery of signatures
C. To speed up the hashing process
D. To ensure public key availability
Answer: B
Explanation: If the private key is compromised, an attacker could create false signatures, undermining the authenticity and non-repudiation of messages.
13. Question: Which attack is digital signatures designed to prevent?
A. Man-in-the-middle attacks
B. Denial-of-service attacks
C. Brute-force attacks on passwords
D. All of the above
Answer: A
Explanation: Digital signatures help prevent man-in-the-middle attacks by verifying the sender’s identity and message integrity.
14. Question: What is the output of a digital signature process?
A. A encrypted message
B. A signature value attached to the message
C. A new public key
D. A compressed file
Answer: B
Explanation: The process produces a signature value, which is the encrypted hash of the message, for attachment and later verification.
15. Question: In ECDSA (Elliptic Curve Digital Signature Algorithm), what makes it efficient?
A. It uses smaller key sizes for the same security level
B. It requires no hashing
C. It only uses symmetric keys
D. It is faster for large messages
Answer: A
Explanation: ECDSA provides the same level of security as other algorithms with shorter key lengths, making it more efficient for devices with limited resources.
16. Question: How does a digital certificate enhance digital signatures?
A. By providing a way to store hashes
B. By binding a public key to an identity
C. By encrypting the private key
D. By generating new keys automatically
Answer: B
Explanation: A digital certificate, issued by a CA, links a public key to the owner’s identity, adding trust to the signature verification process.
17. Question: What is the consequence of a revoked certificate in digital signatures?
A. The signature becomes permanent
B. The associated public key should not be trusted
C. All signatures are automatically verified
D. The private key is deleted
Answer: B
Explanation: A revoked certificate means the public key may no longer be reliable, so any signatures using it should be considered invalid.
18. Question: Which hash function is often used with digital signatures for security?
A. MD5
B. SHA-256
C. CRC32
D. Base64
Answer: B
Explanation: SHA-256 is a secure hash algorithm that produces a fixed-length output, resistant to collisions, making it suitable for digital signatures.
19. Question: Can digital signatures ensure confidentiality?
A. Yes, by encrypting the entire message
B. No, they only ensure integrity and authenticity
C. Yes, through symmetric keys
D. No, but they can compress data
Answer: B
Explanation: Digital signatures focus on verifying the sender and message integrity, not on keeping the message content secret.
20. Question: What is the first step in creating a digital signature?
A. Encrypting the message with a public key
B. Hashing the message
C. Verifying the receiver’s key
D. Revoking old certificates
Answer: B
Explanation: The process begins by hashing the message to create a digest, which is then signed with the private key.
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Part 3: Automatically generate quiz questions using OnlineExamMaker AI Question Generator
Automatically generate questions using AI