Question 1

What is the primary purpose of a digital signature?

Accepted Answer

To verify the authenticity and integrity of a message

Answer

To encrypt the message contents

Answer

To replace traditional signatures

Answer

To create a secure key exchange

Question 2

Which algorithm is commonly used for public key cryptography in digital signatures?

Accepted Answer

RSA

Answer

AES

Answer

SHA-256

Answer

MD5

Question 3

What is the role of a Certificate Authority (CA) in digital signatures?

Accepted Answer

To issue and manage digital certificates

Answer

To encrypt messages

Answer

To store private keys

Answer

To generate random numbers

Question 4

What cryptographic technique is typically employed to ensure two parties can securely exchange keys over an insecure channel?

Accepted Answer

Diffie-Hellman key exchange

Answer

SHA hashing

Answer

AES encryption

Answer

RSA encryption

Question 5

In a digital signature process, what is the purpose of hashing the message before signing it?

Accepted Answer

To create a fixed-size representation of the message

Answer

To verify the sender's identity

Answer

To compress the message

Answer

To encrypt the message

Question 6

What is a common characteristic of asymmetric encryption used in digital signatures?

Accepted Answer

It uses a pair of keys: a public key and a private key

Answer

It is faster than symmetric encryption

Answer

It requires only a single key for encryption and decryption

Answer

It is primarily used for hashing

Question 7

Which of the following statements about digital signatures is true?

Accepted Answer

They provide non-repudiation for the signer

Answer

They can be easily forged

Answer

They require physical presence for validity

Answer

They eliminate the need for encryption

Question 8

What is the main advantage of using digital signatures over traditional handwritten signatures?

Accepted Answer

Increased security and verification capabilities

Answer

They consume less paper

Answer

They can be legally binding without a certificate

Answer

They are easier to create

Question 9

Which component of a digital signature verifies the identity of the signer?

Accepted Answer

The private key used to sign the message

Answer

The digital certificate issued by a CA

Answer

The public key shared with others

Answer

The hash of the message

Question 10

What type of attack does a digital signature help protect against?

Accepted Answer

Man-in-the-middle attacks

Answer

Phishing attacks

Answer

SQL injection attacks

Answer

DDoS attacks

Question 11

What is the primary purpose of a digital signature in secure communications?

Accepted Answer

To provide authentication and integrity of the message

Answer

To act as a backup for data

Answer

To encrypt the message content

Answer

To improve the speed of data transmission

Question 12

In the context of key exchange protocols, what does the Diffie-Hellman method primarily enable?

Accepted Answer

Securely exchanging cryptographic keys over a public channel

Answer

Encrypting data before transmission

Answer

Verifying the authenticity of a digital certificate

Answer

Generating random passwords for user accounts

Question 13

Which cryptographic algorithm is commonly used to create digital signatures?

Accepted Answer

RSA

Answer

SHA-256

Answer

AES

Answer

DES

Question 14

What is the main advantage of using asymmetric key cryptography in digital signatures?

Accepted Answer

It allows one key to be public while another remains private, enabling secure verification.

Answer

It is faster than symmetric key cryptography.

Answer

It requires fewer keys than symmetric key cryptography.

Answer

It is immune to all forms of attacks.

Question 15

What role does a Certificate Authority (CA) play in digital signatures?

Accepted Answer

It issues digital certificates that verify the identity of the entities involved.

Answer

It maintains a database of user passwords.

Answer

It generates random keys for encryption.

Answer

It encrypts messages for secure transmission.

Question 16

What is a common use case for digital signatures in software distribution?

Accepted Answer

To verify that software has not been tampered with since it was signed.

Answer

To encrypt the software code.

Answer

To increase the speed of downloads.

Answer

To provide free software to users.

Question 17

Which of the following is a characteristic of a digital signature?

Accepted Answer

It is unique to the signer and can be verified by anyone with the public key.

Answer

It can be replicated by anyone who has access to the signed document.

Answer

It requires both parties to meet in person for verification.

Answer

It can only be created using symmetric key algorithms.

Question 18

What cryptographic technique is commonly used in digital signatures to ensure data integrity?

Accepted Answer

Hashing

Answer

Compression

Answer

Decryption

Answer

Encryption

Question 19

Which cryptographic concept allows two parties to securely establish a shared secret over an insecure channel?

Accepted Answer

Key Agreement

Answer

Data Encryption

Answer

Digital Signature

Answer

Public Key Infrastructure

Question 20

What is the purpose of using a nonce in key exchange protocols?

Accepted Answer

To prevent replay attacks by ensuring each transaction is unique.

Answer

To reduce the computational load on the server.

Answer

To enhance the speed of the connection.

Answer

To encrypt the data being transmitted.

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