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? -
Answer-Symmetric
/.Which algorithm is designated as a Type 2 product by the National Security Agency
(NSA)? - Answer-Skipjack
/.What is the most commonly used format for certificates? - Answer-X.509 v3
/.What is referenced to determine if a certificate has been revoked? - 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? - Answer-Sender's public key
/.Which type of certificate must be certified by an authority to verify it with other
participants? - Answer-Public Certificate
/.What is an attribute of the Rivest Cipher 4 (RC4) algorithm? - Answer-It requires a
unique nonce.
/.Which mode generates the key stream with a nonce and incrementing value? -
Answer-Counter (CTR)
/.Which mode is a stream algorithm that concatenates an incrementing value with a
nonce? - Answer-Counter (CTR)
/.Which key would an administrator use to encrypt data so only the CEO can decrypt it?
- Answer-CEO's public key
/.What is the result of a hash function? - Answer-Digest
/.What is used to efficiently encrypt large files? - Answer-Symmetric encryption
/.An administrator needs to encrypt the following word with the Atbash cipher: security
What is the correct ciphertext? - Answer-hvxfirgb
, /.Which cryptographic algorithm has a 128-bit hash size? - Answer-Message Digest
Algorithm 5 (MD5)
/.Which characteristic makes a hashing function suitable for use in signature schemes?
- Answer-Collision resistance
/.Which attribute of a hashing function makes a birthday attack possible? - Answer-
Partial-message collision
/.Which hash algorithm produces a 160-bit output value? - Answer-SHA-1
/.What does cipher block chaining (CBC) use with the key to encrypt subsequent blocks
of plaintext? - Answer-Previous generated ciphertext
/.Which mode produces the same ciphertext from two identical plaintext blocks? -
Answer-Electronic codebook (ECB)
/.Which encryption mode is least secure? - Answer-Electronic codebook (ECB)
/.What is the mathematical formula used for symmetric decryption? - Answer-P = E
(K,C)
/.Which algorithm relies on factoring the product of large prime numbers? - 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? - Answer-Pretty
Good Privacy (PGP)
/.Which concept stipulates that algorithms should be openly shared and scrutinized, but
keys must be absolutely secured? - Answer-Kerckhoffs's principle
/.Which encryption process minimizes known plaintext attacks against Advanced
Encryption Standard (AES)? - Answer-Randomizing the initialization vector
/.What prevents a rainbow table attack during the encryption process? - Answer-Salting
/.Which factor increases the required number of attempts in a brute-force attack? -
Answer-Larger key size
/.What is a vulnerability of the Data Encryption Standard (DES)? - Answer-Key length is
too short.
/.Which block size does the Advanced Encryption Standard (AES) use? - Answer-128
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? -
Answer-Symmetric
/.Which algorithm is designated as a Type 2 product by the National Security Agency
(NSA)? - Answer-Skipjack
/.What is the most commonly used format for certificates? - Answer-X.509 v3
/.What is referenced to determine if a certificate has been revoked? - 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? - Answer-Sender's public key
/.Which type of certificate must be certified by an authority to verify it with other
participants? - Answer-Public Certificate
/.What is an attribute of the Rivest Cipher 4 (RC4) algorithm? - Answer-It requires a
unique nonce.
/.Which mode generates the key stream with a nonce and incrementing value? -
Answer-Counter (CTR)
/.Which mode is a stream algorithm that concatenates an incrementing value with a
nonce? - Answer-Counter (CTR)
/.Which key would an administrator use to encrypt data so only the CEO can decrypt it?
- Answer-CEO's public key
/.What is the result of a hash function? - Answer-Digest
/.What is used to efficiently encrypt large files? - Answer-Symmetric encryption
/.An administrator needs to encrypt the following word with the Atbash cipher: security
What is the correct ciphertext? - Answer-hvxfirgb
, /.Which cryptographic algorithm has a 128-bit hash size? - Answer-Message Digest
Algorithm 5 (MD5)
/.Which characteristic makes a hashing function suitable for use in signature schemes?
- Answer-Collision resistance
/.Which attribute of a hashing function makes a birthday attack possible? - Answer-
Partial-message collision
/.Which hash algorithm produces a 160-bit output value? - Answer-SHA-1
/.What does cipher block chaining (CBC) use with the key to encrypt subsequent blocks
of plaintext? - Answer-Previous generated ciphertext
/.Which mode produces the same ciphertext from two identical plaintext blocks? -
Answer-Electronic codebook (ECB)
/.Which encryption mode is least secure? - Answer-Electronic codebook (ECB)
/.What is the mathematical formula used for symmetric decryption? - Answer-P = E
(K,C)
/.Which algorithm relies on factoring the product of large prime numbers? - 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? - Answer-Pretty
Good Privacy (PGP)
/.Which concept stipulates that algorithms should be openly shared and scrutinized, but
keys must be absolutely secured? - Answer-Kerckhoffs's principle
/.Which encryption process minimizes known plaintext attacks against Advanced
Encryption Standard (AES)? - Answer-Randomizing the initialization vector
/.What prevents a rainbow table attack during the encryption process? - Answer-Salting
/.Which factor increases the required number of attempts in a brute-force attack? -
Answer-Larger key size
/.What is a vulnerability of the Data Encryption Standard (DES)? - Answer-Key length is
too short.
/.Which block size does the Advanced Encryption Standard (AES) use? - Answer-128
