WGU C839 OBJECTIVE ASSESSMENT FINAL
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What is referenced to determine if a certificate has been revoked?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
How is X mod N if N = PQ represented in number theory? - ANSWER ( X mod P, X
mod Q)
What is the outcome when using the binary AND function on 11011 and 10100? -
ANSWER 10000
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
How is X mod N if N = PQ represented in number theory? - ANSWER ( X mod P, X
mod Q)
What is the outcome when using the binary AND function on 11011 and 10100? -
ANSWER 10000
