WGU C784 OBJECTIVE ASSESSMENT LATEST / WGU 784 OA
EXAM TEST BANK 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What is referenced to determine if a certificate has been revoked?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
Which block algorithm includes a provision for the decryption key kept in a key
escrow? - ANSWER: Skipjack
What is the result of A|B and B|C? - ANSWER: A|C
EXAM TEST BANK 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
Which block algorithm includes a provision for the decryption key kept in a key
escrow? - ANSWER: Skipjack
What is the result of A|B and B|C? - ANSWER: A|C
