WGU C839 OBJECTIVE ASSESSMENT 2
LATEST VERSIONS (2025-2026 /WGU
C839 INTRODUCTION TO
CRYPTOGRAPHY QUESTIONS AND
ANSWERS
Which encryption standard uses the same key to encrypt and decrypt
messages? - CORRECT ANSWER-Symmetric
Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)? - CORRECT ANSWER-Skipjack
What is the most commonly used format for certificates? - CORRECT
ANSWER-X.509 v3
,What is referenced to determine if a certificate has been revoked? -
CORRECT ANSWER-Certificate revocation list (CRL)
What needs to be installed on end users' computers to allow them to
trust applications that have been digitally signed by the developer? -
CORRECT ANSWER-Sender's public key
Which type of certificate must be certified by an authority to verify
it with other participants? - CORRECT ANSWER-Public Certificate
What is an attribute of the Rivest Cipher 4 (RC4) algorithm? -
CORRECT ANSWER-It requires a unique nonce.
Which mode generates the key stream with a nonce and incrementing
value? - CORRECT ANSWER-Counter (CTR)
Which mode is a stream algorithm that concatenates an incrementing
value with a nonce? - CORRECT ANSWER-Counter (CTR)
Which key would an administrator use to encrypt data so only the CEO
can decrypt it? - CORRECT ANSWER-CEO's public key
What is the result of a hash function? - CORRECT ANSWER-Digest
, What is used to efficiently encrypt large files? - CORRECT ANSWER-
Symmetric encryption
An administrator needs to encrypt the following word with the Atbash
cipher: security What is the correct ciphertext? - CORRECT
ANSWER-hvxfirgb
Which cryptographic algorithm has a 128-bit hash size? - CORRECT
ANSWER-Message Digest Algorithm 5 (MD5)
Which characteristic makes a hashing function suitable for use in
signature schemes? - CORRECT ANSWER-Collision resistance
Which attribute of a hashing function makes a birthday attack
possible? - CORRECT ANSWER-Partial-message collision
Which hash algorithm produces a 160-bit output value? - CORRECT
ANSWER-SHA-1
What does cipher block chaining (CBC) use with the key to encrypt
subsequent blocks of plaintext? - CORRECT ANSWER-Previous
generated ciphertext
LATEST VERSIONS (2025-2026 /WGU
C839 INTRODUCTION TO
CRYPTOGRAPHY QUESTIONS AND
ANSWERS
Which encryption standard uses the same key to encrypt and decrypt
messages? - CORRECT ANSWER-Symmetric
Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)? - CORRECT ANSWER-Skipjack
What is the most commonly used format for certificates? - CORRECT
ANSWER-X.509 v3
,What is referenced to determine if a certificate has been revoked? -
CORRECT ANSWER-Certificate revocation list (CRL)
What needs to be installed on end users' computers to allow them to
trust applications that have been digitally signed by the developer? -
CORRECT ANSWER-Sender's public key
Which type of certificate must be certified by an authority to verify
it with other participants? - CORRECT ANSWER-Public Certificate
What is an attribute of the Rivest Cipher 4 (RC4) algorithm? -
CORRECT ANSWER-It requires a unique nonce.
Which mode generates the key stream with a nonce and incrementing
value? - CORRECT ANSWER-Counter (CTR)
Which mode is a stream algorithm that concatenates an incrementing
value with a nonce? - CORRECT ANSWER-Counter (CTR)
Which key would an administrator use to encrypt data so only the CEO
can decrypt it? - CORRECT ANSWER-CEO's public key
What is the result of a hash function? - CORRECT ANSWER-Digest
, What is used to efficiently encrypt large files? - CORRECT ANSWER-
Symmetric encryption
An administrator needs to encrypt the following word with the Atbash
cipher: security What is the correct ciphertext? - CORRECT
ANSWER-hvxfirgb
Which cryptographic algorithm has a 128-bit hash size? - CORRECT
ANSWER-Message Digest Algorithm 5 (MD5)
Which characteristic makes a hashing function suitable for use in
signature schemes? - CORRECT ANSWER-Collision resistance
Which attribute of a hashing function makes a birthday attack
possible? - CORRECT ANSWER-Partial-message collision
Which hash algorithm produces a 160-bit output value? - CORRECT
ANSWER-SHA-1
What does cipher block chaining (CBC) use with the key to encrypt
subsequent blocks of plaintext? - CORRECT ANSWER-Previous
generated ciphertext
