WGU D334 EXAMINATION TEST 2026
VERIFIED QUESTIONS AND SOLUTIONS
◉ Cipher Block Chaining (CBC)
Answer: IV XOR Block 1 = Cipher text 1, Cipher Text 1 XOR Block 2 =
Cipher text 2.
◉ Cipher Feedback (CFB)
Answer: IV encrypted XOR Block 1 = Cipher 1, Cipher 1 XOR Block 2
= Cipher 2
◉ Output Feedback (OFB)
Answer: IV encrypted XOR Block 1 = Cipher 1, Cipher 1 encrypted
XOR Block 2 = Cipher 2
◉ Counter Mode (CTR)
Answer: Nonce encrypted XOR Block 1 = Cipher 1, Nonce +1
encrypted XOR block 2 = Cipher 2
◉ Rainbow Table
, Answer: A table of hash values and their corresponding plaintext
values that can be used to look up password values if an attacker is
able to steal a system's encrypted password file.
◉ HMAC
Answer: a fixed length string of bits similar to other hashing
algorithms such as MD5 and SHA-1, but it also uses a secret key to
add some randomness to the result.
◉ Pigpen Cipher
Answer: a geometric simple substitution cipher, which exchanges
letters for symbols which are fragments of a grid
◉ Rail Code
Answer: scrambles text by writing it across rows and columns
◉ bifid cipher
Answer: maps letters in a grid to numeric values
◉ Playfair Cipher
Answer: Uses a 5x5 table and a key word. Rest of the alphabet is
placed on table in alphabetic order, skipping letters used in the
keyword. You break up the message into two character chunks and
return a single character value. If the letters appear on the same row
VERIFIED QUESTIONS AND SOLUTIONS
◉ Cipher Block Chaining (CBC)
Answer: IV XOR Block 1 = Cipher text 1, Cipher Text 1 XOR Block 2 =
Cipher text 2.
◉ Cipher Feedback (CFB)
Answer: IV encrypted XOR Block 1 = Cipher 1, Cipher 1 XOR Block 2
= Cipher 2
◉ Output Feedback (OFB)
Answer: IV encrypted XOR Block 1 = Cipher 1, Cipher 1 encrypted
XOR Block 2 = Cipher 2
◉ Counter Mode (CTR)
Answer: Nonce encrypted XOR Block 1 = Cipher 1, Nonce +1
encrypted XOR block 2 = Cipher 2
◉ Rainbow Table
, Answer: A table of hash values and their corresponding plaintext
values that can be used to look up password values if an attacker is
able to steal a system's encrypted password file.
◉ HMAC
Answer: a fixed length string of bits similar to other hashing
algorithms such as MD5 and SHA-1, but it also uses a secret key to
add some randomness to the result.
◉ Pigpen Cipher
Answer: a geometric simple substitution cipher, which exchanges
letters for symbols which are fragments of a grid
◉ Rail Code
Answer: scrambles text by writing it across rows and columns
◉ bifid cipher
Answer: maps letters in a grid to numeric values
◉ Playfair Cipher
Answer: Uses a 5x5 table and a key word. Rest of the alphabet is
placed on table in alphabetic order, skipping letters used in the
keyword. You break up the message into two character chunks and
return a single character value. If the letters appear on the same row
