Cybersecurity Essentials Chapter 4 Quiz Questions Answers

Cybersecurity Essentials 1.1 Chapter 4 Quiz Answers Full Questions

Chapter 4: The Art of Protecting Secrets

1.Which asymmetric algorithm provides an electronic key exchange method to share the secret key?

  • RSA
  • Diffie-Hellman
  • WEP
  • DES
  • hashing

Explanation: Diffie-Hellman provides an electronic exchange method to share a secret key and is used by multiple secure protocols.

2.What encryption algorithm uses one key to encrypt data and a different key to decrypt data?

  • transposition
  • symmetric
  • asymmetric
  • one-time pad

Explanation: Asymmetric encryption uses one key to encrypt data and a different key to decrypt data.

3. What type of cipher encrypts plaintext one byte or one bit at a time?

  • block
  • stream
  • hash
  • enigma
  • elliptical

Explanation: Stream ciphers encrypt plaintext one byte or one bit at a time, and can be much faster than block ciphers.

4. What cryptographic algorithm is used by the NSA and includes the use of elliptical curves for digital signature generation and key exchange?

  • ECC
  • RSA
  • AES
  • El-Gamal
  • IDEA

Explanation: Elliptic curve cryptography (ECC) uses elliptic curves as part of the algorithm for digital signature generation and key exchange.

5.What is the term used to describe the science of making and breaking secret codes?

  • factorization
  • cryptology
  • impersonation
  • spoofing
  • jamming

Explanation: Cryptology is the science of making and breaking codes to make sure that cyber criminals cannot easily compromise protected information.

6.Which three processes are examples of logical access controls? (Choose three.)

  • intrusion detection system (IDS) to watch for suspicious network activity
  • firewalls to monitor traffic
  • guards to monitor security screens
  • fences to protect the perimeter of a building
  • swipe cards to allow access to a restricted area
  • biometrics to validate physical characteristics

Explanation: Logical access controls includes but is not limited to the following:
Smart cards
Access Control Lists (ACLs)
Intrusion Detection Systems (IDS)

7.What term is used to describe concealing data in another file such as a graphic, audio, or other text file?

  • masking
  • hiding
  • obfuscation
  • steganography

Explanation: Steganography conceals data in a file such as a graphic, audio, or other text file and is used to prevent extra attention to the encrypted data because the data is not easily viewed.

8.What are three examples of administrative access controls? (Choose three.)

  • policies and procedures
  • encryption
  • background checks
  • hiring practices
  • intrusion detection system (IDS)
  • guard dogs

Explanation: Administrative access controls are defined by organizations to implement and enforce all aspects of controlling unauthorized access and include the following:
Hiring practices
Background checks
Data classification
Security training

9.Which three protocols use asymmetric key algorithms? (Choose three.)

  • Secure File Transfer Protocol (SFTP)
  • Telnet
  • Pretty Good Privacy (PGP)
  • Secure Shell (SSH)
  • Advanced Encryption Standard (AES)
  • Secure Sockets Layer (SSL)

Explanation: Four protocols use asymmetric key algorithms:
Internet Key Exchange (IKE)
Secure Socket Layer (SSL)
Secure Shell (SSH)
Pretty Good Privacy (PGP)

10.A warning banner that lists the negative outcomes of breaking company policy is displayed each time a computer user logs in to the machine. What type of access control is implemented?

  • masking
  • deterrent
  • detective
  • preventive

Explanation: Deterrents are implemented to discourage or mitigate an action or the behavior of a malicious person.

11. Which term describes the technology that protects software from unauthorized access or modification?

  • copyright
  • watermarking
  • access control
  • trademark

Explanation: Software watermarking inserts a secret message into the program as proof of ownership and protects software from unauthorized access or modification.

12. What encryption algorithm uses the same pre-shared key to encrypt and decrypt data?

  • hash
  • asymmetric
  • one-time pad
  • symmetric

Explanation: Symmetric encryption algorithms use the same pre-shared key to encrypt and decrypt data.

13.Which two terms are used to describe cipher keys? (Choose two.)

  • key space
  • key randomness
  • keylogging
  • key length

14.Match the type of multifactor authentication with the description.

Explanation: Multi-factor authentication uses a minimum of two methods of verification and can include the following:
Something you have
Something you know
Something you are

15. What is the name of the method in which letters are rearranged to create the ciphertext?

  • substitution
  • transposition
  • one-time pad
  • enigma

Explanation: Ciphertext can be created by using the following:
Transposition – letters are rearranged
Substitution – letters are replaced
One-time pad – plaintext combined with a secret key creates a new character, which then combines with the plaintext to produce ciphertext

16. Which 128-bit block cipher encryption algorithm does the US government use to protect classified information?

  • Vignere
  • AES
  • Caesar
  • 3DES
  • Skipjack

Explanation: The Advanced Encryption Standard (AES) is used to protect classified information by the U.S. government and is a strong algorithm that uses longer key lengths.

17.Match the description with the correct term. (Not all targets are used.)

  • steganography —> hiding data within an audio file
  • steganalysis —> discovering that hidden information exists within a graphic file
  • social steganography —> creating a message that says one thing but means something else to a specific audience
  • obfuscation —> making a message confusing so it is harder to understand
  • Other Incorrect Match Options:
    • replacing sensitive information in a file with nonsensitive information

18. What term is used to describe the technology that replaces sensitive information with a nonsensitive version?

  • blanking
  • whiteout
  • masking
  • retracting
  • hiding

Explanation: Data masking replaces sensitive information with nonsensitive information. After replacement, the nonsensitive version looks and acts like the original.

19. Which type of cipher is able to encrypt a fixed-length block of plaintext into a 128-bit block of ciphertext at any one time?

  • transform
  • stream
  • hash
  • symmetric
  • block

Explanation: Block ciphers transform a fixed-length block of plaintext into a block of ciphertext. To decrypt the ciphertext, the same secret key to encrypt is used in reverse.

20. Which three devices represent examples of physical access controls? (Choose three.)

  • locks
  • routers
  • swipe cards
  • firewalls
  • servers
  • video cameras

Explanation: Physical access controls include but are not limited to the following:Guards
Motion detectors
Laptop locks
Locked doors
Swipe cards
Guard dogs
Video cameras


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