Test Bank for WGU D430 Fundamentals of
Information Security 2025 – 100% Verified
Questions and Detailed Correct Answers |
Objective Assessment | Graded A+
Cryptography (15 Questions)
Question 1
What is the primary purpose of encryption in information security?
A. Ensure data availability
B. Protect data confidentiality
C. Verify user identity
D. Prevent data modification
Correct Answer: B
Rationale: Encryption transforms data into an unreadable format to protect its confidentiality,
ensuring only authorized parties with the decryption key can access it.
Question 2
Which encryption algorithm is commonly used for secure web communication (HTTPS)?
A. DES
B. AES
C. RSA
D. MD5
Correct Answer: B
Rationale: AES (Advanced Encryption Standard) is widely used in TLS/SSL for HTTPS,
providing strong symmetric encryption. DES is outdated, RSA is asymmetric, and MD5 is a
hashing algorithm, not encryption.
Question 3
What is a key difference between symmetric and asymmetric encryption?
A. Symmetric uses two keys; asymmetric uses one
B. Symmetric uses one key; asymmetric uses a key pair
C. Symmetric is slower; asymmetric is faster
D. Symmetric is for hashing; asymmetric is for encryption
Correct Answer: B
, Rationale: Symmetric encryption uses a single shared key for encryption and decryption, while
asymmetric uses a public-private key pair.
Question 4
Which cryptographic method ensures data integrity?
A. Encryption
B. Digital signature
C. Key exchange
D. Non-repudiation
Correct Answer: B
Rationale: Digital signatures use hashing and asymmetric encryption to verify data integrity and
authenticity, ensuring data has not been altered.
Question 5
What is the purpose of a salt in password hashing?
A. Speeds up encryption
B. Prevents rainbow table attacks
C. Ensures data availability
D. Simplifies key management
Correct Answer: B
Rationale: A salt adds random data to passwords before hashing, making precomputed rainbow
table attacks ineffective.
Question 6
Which protocol uses asymmetric encryption for secure key exchange?
A. FTP
B. Diffie-Hellman
C. SNMP
D. SMTP
Correct Answer: B
Rationale: Diffie-Hellman enables secure key exchange over an insecure channel using
asymmetric cryptography.
Question 7
What is a characteristic of a strong encryption key?
A. Short length for speed
B. Random and complex structure
C. Based on user’s name
D. Reused across systems
Correct Answer: B
Rationale: Strong keys are long, random, and complex to resist brute-force attacks. Short keys
(A), user-based keys (C), or reused keys (D) are insecure.
Information Security 2025 – 100% Verified
Questions and Detailed Correct Answers |
Objective Assessment | Graded A+
Cryptography (15 Questions)
Question 1
What is the primary purpose of encryption in information security?
A. Ensure data availability
B. Protect data confidentiality
C. Verify user identity
D. Prevent data modification
Correct Answer: B
Rationale: Encryption transforms data into an unreadable format to protect its confidentiality,
ensuring only authorized parties with the decryption key can access it.
Question 2
Which encryption algorithm is commonly used for secure web communication (HTTPS)?
A. DES
B. AES
C. RSA
D. MD5
Correct Answer: B
Rationale: AES (Advanced Encryption Standard) is widely used in TLS/SSL for HTTPS,
providing strong symmetric encryption. DES is outdated, RSA is asymmetric, and MD5 is a
hashing algorithm, not encryption.
Question 3
What is a key difference between symmetric and asymmetric encryption?
A. Symmetric uses two keys; asymmetric uses one
B. Symmetric uses one key; asymmetric uses a key pair
C. Symmetric is slower; asymmetric is faster
D. Symmetric is for hashing; asymmetric is for encryption
Correct Answer: B
, Rationale: Symmetric encryption uses a single shared key for encryption and decryption, while
asymmetric uses a public-private key pair.
Question 4
Which cryptographic method ensures data integrity?
A. Encryption
B. Digital signature
C. Key exchange
D. Non-repudiation
Correct Answer: B
Rationale: Digital signatures use hashing and asymmetric encryption to verify data integrity and
authenticity, ensuring data has not been altered.
Question 5
What is the purpose of a salt in password hashing?
A. Speeds up encryption
B. Prevents rainbow table attacks
C. Ensures data availability
D. Simplifies key management
Correct Answer: B
Rationale: A salt adds random data to passwords before hashing, making precomputed rainbow
table attacks ineffective.
Question 6
Which protocol uses asymmetric encryption for secure key exchange?
A. FTP
B. Diffie-Hellman
C. SNMP
D. SMTP
Correct Answer: B
Rationale: Diffie-Hellman enables secure key exchange over an insecure channel using
asymmetric cryptography.
Question 7
What is a characteristic of a strong encryption key?
A. Short length for speed
B. Random and complex structure
C. Based on user’s name
D. Reused across systems
Correct Answer: B
Rationale: Strong keys are long, random, and complex to resist brute-force attacks. Short keys
(A), user-based keys (C), or reused keys (D) are insecure.
