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.50...
WGU C839 OBJECTIVE ASSESSMENT 2 LATEST VERSIONS (VERSION A & B)
WGU C839 OBJECTIVE ASSESSMENT 2 LATEST VERSIONS (VERSION A &
B) 2023-2024 /WGU C839 INTRODUCTION TO CRYPTOGRAPHY OA
ACTUAL EXAM
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What is referenced to determine if a certificate has been revoked?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)
WGU C839 OBJECTIVE ASSESSMENT 2 LATEST VERSIONS (VERSION A & B)
, WGU C839 OBJECTIVE ASSESSMENT 2 LATEST VERSIONS (VERSION A & B)
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
Which mode produces the same ciphertext from two identical plaintext blocks? -Correct
Answer ✔Electronic codebook (ECB)
Which encryption mode is least secure? -Correct Answer ✔Electronic codebook (ECB)
What is the mathematical formula used for symmetric decryption? -Correct Answer ✔P
= E (K,C)
Which algorithm relies on factoring the product of large prime numbers? -Correct
Answer ✔Rivest-Shamir-Adleman
Which encryption technology is a serial combination of hashing, data compression,
symmetric-key cryptography, and public key infrastructure (PKI) and can be used for
encrypting texts, emails, files, and directories or for full disk encryption? -Correct
Answer ✔Pretty Good Privacy (PGP)
Which concept stipulates that algorithms should be openly shared and scrutinized, but
keys must be absolutely secured? -Correct Answer ✔Kerckhoffs's principle
Which encryption process minimizes known plaintext attacks against Advanced
Encryption Standard (AES)? -Correct Answer ✔Randomizing the initialization vector
What prevents a rainbow table attack during the encryption process? -Correct Answer
✔Salting
Which factor increases the required number of attempts in a brute-force attack? -
Correct Answer ✔Larger key size
What is a vulnerability of the Data Encryption Standard (DES)? -Correct Answer ✔Key
length is too short.
Which block size does the Advanced Encryption Standard (AES) use? -Correct Answer
✔128
WGU C839 OBJECTIVE ASSESSMENT 2 LATEST VERSIONS (VERSION A & B)
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