WGU D488 Pre - Assessment (Latest
Update ) Cybersecurity
Architecture and Engineering | Test
Guide Questions and Answers |
Grade A | 100% Correct (Verified
Solutions)
Question:
Mode of Operation:
Answer:
used with symmetric block ciphers to enable them to work on large sets of
data. Modes of operation affect the level of security provided by the
underlying block cipher.
Question:
Cipher Block Chaining (CBC)
Answer:
Very simple mode. Should not be used, susceptible to the padding-oracle
attack.
,Question:
Electronic Codebook (ECB)
Answer:
Simple mode, also should not be used and is susceptible to the padding-
oracle attack.
Question:
Galois/Counter Mode (GCM)
Answer:
Provides authenticated encryption with associated data and is widely adopted
due to its performance. A specialized form of counter mode whereby "Galois"
modification provides the authentication feature.
Question:
Counter (CTR)
Answer:
Applies IV plus an incrementing counter value to the key to generate a
keystream. Counter modes do not need to use padding. Any unused space in
the last block is simply discarded.
, Question:
Output Feedback (OFB)
Answer:
Uses an initial Chaining vector (ICV) for the first round of encryption and
combines the output of all previous rounds as input for all subsequent
rounds.
Question:
Asymmetric encryption
Answer:
operations are performed by two different but related, public and private keys
in a key pair. Each key is capable of reversing the operation of its pair. For
example, if the public key is used to encrypt a message, only the paired
private key can decrypt the ciphertext produced. The public key cannot be
used to decrypt the ciphertext, even though it was used to encrypt it.
Question:
Elliptic-Curve Diffie Hellman (ECDH)
Answer:
The operation of ECDH is similar to standard DH but utilizes math based on
elliptic curves instead of discrete logs, as is the case for DH.
Update ) Cybersecurity
Architecture and Engineering | Test
Guide Questions and Answers |
Grade A | 100% Correct (Verified
Solutions)
Question:
Mode of Operation:
Answer:
used with symmetric block ciphers to enable them to work on large sets of
data. Modes of operation affect the level of security provided by the
underlying block cipher.
Question:
Cipher Block Chaining (CBC)
Answer:
Very simple mode. Should not be used, susceptible to the padding-oracle
attack.
,Question:
Electronic Codebook (ECB)
Answer:
Simple mode, also should not be used and is susceptible to the padding-
oracle attack.
Question:
Galois/Counter Mode (GCM)
Answer:
Provides authenticated encryption with associated data and is widely adopted
due to its performance. A specialized form of counter mode whereby "Galois"
modification provides the authentication feature.
Question:
Counter (CTR)
Answer:
Applies IV plus an incrementing counter value to the key to generate a
keystream. Counter modes do not need to use padding. Any unused space in
the last block is simply discarded.
, Question:
Output Feedback (OFB)
Answer:
Uses an initial Chaining vector (ICV) for the first round of encryption and
combines the output of all previous rounds as input for all subsequent
rounds.
Question:
Asymmetric encryption
Answer:
operations are performed by two different but related, public and private keys
in a key pair. Each key is capable of reversing the operation of its pair. For
example, if the public key is used to encrypt a message, only the paired
private key can decrypt the ciphertext produced. The public key cannot be
used to decrypt the ciphertext, even though it was used to encrypt it.
Question:
Elliptic-Curve Diffie Hellman (ECDH)
Answer:
The operation of ECDH is similar to standard DH but utilizes math based on
elliptic curves instead of discrete logs, as is the case for DH.
