Master Encryption and Code Security: Enhance Network Security

Question 1

Which fundamental property of cryptography ensures that information remains private and inaccessible to unauthorized individuals?

Accepted Answer

Confidentiality

Answer

Integrity

Answer

Authentication

Answer

Non-repudiation

Question 2

What is the critical role of a public-key infrastructure (PKI) within a cryptographic system?

Accepted Answer

Securely managing and distributing digital certificates.

Answer

Generating and distributing encryption keys.

Answer

Providing secure channels for communication.

Answer

Preventing unauthorized data access.

Question 3

In digital signatures, a hash function is utilized to:

Accepted Answer

Ensure the integrity and authenticity of the message.

Answer

Generate a unique identifier for the message.

Answer

Encrypt the message for secure transmission.

Answer

Generate an encryption key for the message.

Question 4

Which of the following is the most widely used type of symmetric encryption algorithm?

Accepted Answer

Advanced Encryption Standard (AES)

Answer

RSA

Answer

Data Encryption Standard (DES)

Answer

Diffie-Hellman key exchange

Question 5

Which of the following protocols is commonly used for secure key exchange in communication systems?

Accepted Answer

Diffie-Hellman key exchange

Answer

Hypertext Transfer Protocol Secure (HTTPS)

Answer

Secure Shell (SSH)

Answer

Simple Mail Transfer Protocol (SMTP)

Question 6

Which of the following is a recommended method for securely managing encryption keys?

Accepted Answer

Public Key Infrastructure (PKI)

Answer

Key escrow

Answer

Certificate Authority

Answer

Kerberos

Question 7

What is the primary reason for using a salt in password hashing?

Accepted Answer

To increase the randomness and make brute-force attacks more difficult

Answer

To store the password in plain text for easier recovery

Answer

To make the password more complex and memorable

Answer

To prevent rainbow table attacks

Question 8

Which of the following techniques is primarily used to protect against eavesdropping in network communication?

Accepted Answer

Encryption

Answer

Firewalls

Answer

Intrusion Detection Systems (IDS)

Answer

Virtual Private Networks (VPNs)

Question 9

What is the main role of a Digital Certificate in secure communication?

Accepted Answer

To verify the identity of the sender or server

Answer

To encrypt the communication channel

Answer

To ensure the integrity of the message

Answer

To generate encryption keys

Question 10

What is the primary goal of cryptography?

Accepted Answer

To ensure the confidentiality, integrity, and authenticity of information

Answer

To prevent data loss

Answer

To detect network intrusions

Answer

To recover corrupted data

Question 11

How do ethical considerations shape the development and implementation of cryptographic systems?

Accepted Answer

Ethical considerations guide the development and deployment of cryptographic systems, balancing security, privacy, and societal well-being.

Answer

Ethical considerations have no bearing on the design and execution of cryptographic systems.

Answer

Ethical considerations primarily affect the distribution of cryptographic systems.

Answer

Ethical considerations should focus solely on the security of the cryptographic system.

Question 12

Which of the following is a symmetric-key encryption algorithm?

Accepted Answer

AES

Answer

RSA

Answer

ECC

Answer

SHA-256

Question 13

What is the primary purpose of a hash function?

Accepted Answer

To create a unique fingerprint of a message

Answer

To generate a random number

Answer

To encrypt a message

Answer

To decrypt a message

Question 14

Which type of certificate is commonly used to verify the identity of a website?

Accepted Answer

A and B

Answer

SSL certificate

Answer

X.509 certificate

Answer

TLS certificate

Question 15

Which of the following is a symmetric encryption algorithm used for data encryption and decryption with the same key?

Accepted Answer

AES

Answer

RSA

Answer

Diffie-Hellman

Answer

HMAC

Question 16

What is the primary purpose of a cryptographic hash function?

Accepted Answer

To generate a unique and irreversible digest or fingerprint of a given data input

Answer

To encrypt data using a secret key

Answer

To generate encryption keys for symmetric or asymmetric algorithms

Answer

To decrypt data using a private key

Question 17

Describe the fundamental difference between plaintext and ciphertext in the context of cryptography.

Accepted Answer

Plaintext is readable and understandable, while ciphertext is encrypted and appears as seemingly random data.

Answer

Plaintext and ciphertext are both readable and understandable.

Answer

Plaintext is encrypted, while ciphertext is readable and understandable.

Question 18

Which of the following is a prominent application of cryptography in network security, providing secure communication channels?

Accepted Answer

Secure Socket Layer (SSL)

Answer

Transmission Control Protocol (TCP)

Answer

Dynamic Host Configuration Protocol (DHCP)

Question 19

What is the primary purpose of using a salt when hashing data, especially in the context of password storage?

Accepted Answer

To make it more difficult for attackers to guess or crack hashed passwords by adding randomness and uniqueness to the hashing process

Answer

To speed up the hashing process

Answer

To reduce the size of the hashed output

Question 20

Which of the following is an example of a public key encryption algorithm used for secure key exchange and digital signatures?

Accepted Answer

RSA

Answer

Blowfish

Answer

DES

Answer

AES

Question 21

What is the primary role of a trusted third party (TTP) in a cryptographic system?

Accepted Answer

To verify and certify the authenticity of digital certificates, ensuring trust between parties in digital communications

Answer

To generate encryption keys for secure data transmission

Answer

To decrypt data using a private key

Question 22

Which of the following is a key benefit of using encryption?

Accepted Answer

Enhanced data confidentiality

Answer

Decreased data security

Answer

Reduced data integrity

Answer

Increased risk of data breaches

Question 23

What is the process of transforming plaintext into an unreadable format called?

Accepted Answer

Encryption

Answer

Decryption

Answer

Hashing

Question 24

Which of the following encryption algorithms is widely used for symmetric encryption in secure communication protocols?

Accepted Answer

AES

Answer

MD5

Answer

RSA

Answer

DES

Question 25

What is the primary purpose of using public-key cryptography?

Accepted Answer

Secure key exchange and digital signatures

Answer

Generating random encryption keys

Answer

Encrypting and decrypting large data sets

Answer

Hashing data for integrity verification

Question 26

Which of the following is considered a best practice for secure key management?

Accepted Answer

Regularly rotating encryption keys

Answer

Sharing keys with multiple parties without restriction

Answer

Storing keys on personal devices

Answer

Using weak or easily guessable keys

Question 27

What is the primary function of a cryptographic hash function?

Accepted Answer

Creating a unique and fixed-size fingerprint of data

Answer

Encrypting data for secure storage

Answer

Generating encryption keys

Question 28

Which attack method involves attempting to guess or crack an encryption key by trying a large number of possible combinations?

Accepted Answer

Brute-force attack

Answer

Social engineering

Answer

Phishing

Answer

Malware

Question 29

What is the primary purpose of a digital certificate?

Accepted Answer

To verify the identity of a website or entity and establish trust

Answer

To generate secure encryption keys

Answer

To store user passwords securely

Answer

To encrypt data transmissions

Question 30

Which type of encryption mode processes data in discrete blocks?

Accepted Answer

Block cipher

Answer

Public-key cipher

Answer

Stream cipher

Answer

Hash function

Question 31

What is the term for the study of techniques used to break encryption algorithms and systems?

Accepted Answer

Cryptanalysis

Answer

Key management

Answer

Hashing

Answer

Cryptography