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WGU C839 – Introduction to Cryptography Preparation Exam
Newest Actual Complete Real Exam Questions and Answers
Practice Questions With Solutions and Rationales Newest 2026-
2027 | Already Graded A+
Which cryptographic goal ensures that information is not altered during transmission?
Availability
B. Nonrepudiation
C. Confidentiality
D. Integrity
Rationale: Integrity ensures that data remains accurate and unchanged during storage or
transmission.
Which type of cryptography uses the same key for encryption and decryption?
Hashing
B. Public key cryptography
C. Symmetric cryptography
D. Asymmetric authentication
Rationale: Symmetric algorithms use a shared secret key for both encryption and decryption
operations.
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Which algorithm is considered a symmetric block cipher?
RSA
B. ECC
C. AES
D. Diffie-Hellman
Rationale: AES is a symmetric block cipher widely used for modern encryption standards.
A security analyst wants to ensure a sender cannot deny transmitting a message. Which
property is required?
Integrity
B. Availability
C. Confidentiality
D. Nonrepudiation
Rationale: Nonrepudiation prevents a sender from denying authorship or transmission of a
message.
Which cryptographic technique converts plaintext into unreadable ciphertext?
Salting
B. Hashing
C. Tokenization
D. Encryption
Rationale: Encryption transforms readable plaintext into ciphertext using an algorithm and
key.
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Which attack attempts every possible key until the correct one is discovered?
Birthday attack
B. Replay attack
C. Brute-force attack
D. Downgrade attack
Rationale: Brute-force attacks systematically test all key combinations until the correct key is
found.
Which cryptographic algorithm is commonly used for digital signatures?
AES
B. DES
C. RSA
D. Blowfish
Rationale: RSA supports digital signature creation and verification through asymmetric key
pairs.
What is the primary purpose of hashing?
Key exchange
B. Encryption
C. Compression
D. Integrity verification
Rationale: Hash functions create fixed-length digests used to verify data integrity.
Which protocol is commonly used to secure web traffic?
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FTP
B. SNMP
C. TLS
D. Telnet
Rationale: TLS secures communications over networks, especially HTTPS web traffic.
Which algorithm replaced DES as the preferred encryption standard?
RC4
B. SHA-1
C. AES
D. MD5
Rationale: AES replaced DES because DES became vulnerable due to its small key size.
A digital certificate primarily binds what two components together?
Password and token
B. Ciphertext and plaintext
C. Identity and public key
D. Symmetric and asymmetric keys
Rationale: Digital certificates bind an entity’s identity to its public key.
Which organization is responsible for maintaining many Internet cryptographic standards?
ISO
B. IEEE
WGU C839 – Introduction to Cryptography Preparation Exam
Newest Actual Complete Real Exam Questions and Answers
Practice Questions With Solutions and Rationales Newest 2026-
2027 | Already Graded A+
Which cryptographic goal ensures that information is not altered during transmission?
Availability
B. Nonrepudiation
C. Confidentiality
D. Integrity
Rationale: Integrity ensures that data remains accurate and unchanged during storage or
transmission.
Which type of cryptography uses the same key for encryption and decryption?
Hashing
B. Public key cryptography
C. Symmetric cryptography
D. Asymmetric authentication
Rationale: Symmetric algorithms use a shared secret key for both encryption and decryption
operations.
,2|Page
Which algorithm is considered a symmetric block cipher?
RSA
B. ECC
C. AES
D. Diffie-Hellman
Rationale: AES is a symmetric block cipher widely used for modern encryption standards.
A security analyst wants to ensure a sender cannot deny transmitting a message. Which
property is required?
Integrity
B. Availability
C. Confidentiality
D. Nonrepudiation
Rationale: Nonrepudiation prevents a sender from denying authorship or transmission of a
message.
Which cryptographic technique converts plaintext into unreadable ciphertext?
Salting
B. Hashing
C. Tokenization
D. Encryption
Rationale: Encryption transforms readable plaintext into ciphertext using an algorithm and
key.
,3|Page
Which attack attempts every possible key until the correct one is discovered?
Birthday attack
B. Replay attack
C. Brute-force attack
D. Downgrade attack
Rationale: Brute-force attacks systematically test all key combinations until the correct key is
found.
Which cryptographic algorithm is commonly used for digital signatures?
AES
B. DES
C. RSA
D. Blowfish
Rationale: RSA supports digital signature creation and verification through asymmetric key
pairs.
What is the primary purpose of hashing?
Key exchange
B. Encryption
C. Compression
D. Integrity verification
Rationale: Hash functions create fixed-length digests used to verify data integrity.
Which protocol is commonly used to secure web traffic?
, 4|Page
FTP
B. SNMP
C. TLS
D. Telnet
Rationale: TLS secures communications over networks, especially HTTPS web traffic.
Which algorithm replaced DES as the preferred encryption standard?
RC4
B. SHA-1
C. AES
D. MD5
Rationale: AES replaced DES because DES became vulnerable due to its small key size.
A digital certificate primarily binds what two components together?
Password and token
B. Ciphertext and plaintext
C. Identity and public key
D. Symmetric and asymmetric keys
Rationale: Digital certificates bind an entity’s identity to its public key.
Which organization is responsible for maintaining many Internet cryptographic standards?
ISO
B. IEEE
