WGU D334 FINAL EXAM 2025/2026 |
COMPLETE QUESTIONS AND ANSWERS
WITH RATIONALES | 100% VERIFIED/
GRADED A+< RECENT UPDATE>
Triple Data Encryption Standard (3DES) - ANSWER Symmetric, Block size:
64, Key size: 112, Rounds: 48
Advanced Encryption Standard (AES) - ANSWER Symmetric, Block size: 128,
Key Size: 128,192,256, Rounds: 10, 12, 14
International Data Encryption Algorithm (IDEA) - ANSWER Symmetric,
Block Size: 64, Key Size: 128, Rounds: 17+
Skipjack - ANSWER Symmetric, Block Size: 64, Key Size: 80, Rounds: 32
Blowfish - ANSWER Symmetric, Block Size: 64, Key Size: 128, 192, 256,
Rounds: 16
DES block size and key size? - ANSWER 64bit block size, 56bit key size
3DES block size and key size? - ANSWER 64bit block size, 112bit key size
,AES block size and key size? - ANSWER 128bit block size, 128, 192, or 256bit
key size
IDEA block size and key size? - ANSWER 64bit block size, 128bit key size
Skipjack block size and key size? - ANSWER 64bit block size, 80bit key size
Blowfish block size and key size? - ANSWER 64bit block size, 32-448bit key
size (commonly 128, 192, or 256)
Caesar Cipher - ANSWER A substitution cipher that shifts characters a certain
number of positions in the alphabet
Multi-Alphabet Substitution Cipher - ANSWER Doing something like +1, -2,
+3, and shifting each character a different amount to the left or right. For example,
doing +1, -2, +3 with a dog would result in emj.
Vigenere Cipher - ANSWER An encryption algorithm that works by applying a
keyword to a plaintext. The keyword is aligned with the plaintext, and each letter
of the keyword determines by how many places the plaintext should be rotated. For
example, "D" signals a rotation of 3. In short is uses multiple Caesar Ciphers to
encrypt a single plaintext, making it more secure.
Playfair Cipher - ANSWER Invented by Charles Wheatstone in 1854. Encrypts
two letters instead of one; this makes it more complex. Uses a 5x5 table containing
a keyword. No more secure than any other older ciphers.
, Affine Cipher - ANSWER Any single substitution alphabet ciphers where each
letter in the alphabet is mapped to some numeric value, permuted with some
relatively simple mathematical function, and then converted back to a letter.
The formula for any basic cipher of this type is ax+b(modM), M being the size of
the alphabet, so for example Caeser cipher would be 1x+3(mod26)
Bifid Cipher - ANSWER Makes use of a grid that maps the letters into numeric
values.
homophonic cipher - ANSWER A method of encryption where single plaintext
letters can be represented by any of several different ciphertext symbols.
Scrambled Alphabet - ANSWER Each letter in the alphabet is mapped to a
random letter.
Morse Code - ANSWER a system of dots and dashes that represent the alphabet
Pig Pen Cipher - ANSWER Mono alphabetic
4 grid in a square and diagonal shape
Rail Code - ANSWER Employs a method to scramble text by writing it in a
sequence across a number of rails.
Permutations - ANSWER a complete change; a transformation
, Combination - ANSWER a grouping of items in which order does not matter
one-time pad (OTP) - ANSWER Combining plaintext with a random key to
create a ciphertext that cannot be broken mathematically.
Reed-Solomon - ANSWER A more complex data integrity scheme to not only
detect errors but also correct them
Rainbow Table Attack - ANSWER A type of password attack where an attacker
uses a set of related plaintext passwords and their hashes to crack passwords.
Dictionary Attack - ANSWER A password attack that creates encrypted
versions of common dictionary words and compares them against those in a stolen
password file.
Stream Encryption - ANSWER an encryption algorithm that breaks a plaintext
message down into single bits and encrypts 1 bit of plaintext at a time
Block Encryption - ANSWER involves breaking down plaintext messages into
fixed-size blocks before converting them into ciphertext using a key
padding - ANSWER Adding characters to cipher blocks to avoid patterns
COMPLETE QUESTIONS AND ANSWERS
WITH RATIONALES | 100% VERIFIED/
GRADED A+< RECENT UPDATE>
Triple Data Encryption Standard (3DES) - ANSWER Symmetric, Block size:
64, Key size: 112, Rounds: 48
Advanced Encryption Standard (AES) - ANSWER Symmetric, Block size: 128,
Key Size: 128,192,256, Rounds: 10, 12, 14
International Data Encryption Algorithm (IDEA) - ANSWER Symmetric,
Block Size: 64, Key Size: 128, Rounds: 17+
Skipjack - ANSWER Symmetric, Block Size: 64, Key Size: 80, Rounds: 32
Blowfish - ANSWER Symmetric, Block Size: 64, Key Size: 128, 192, 256,
Rounds: 16
DES block size and key size? - ANSWER 64bit block size, 56bit key size
3DES block size and key size? - ANSWER 64bit block size, 112bit key size
,AES block size and key size? - ANSWER 128bit block size, 128, 192, or 256bit
key size
IDEA block size and key size? - ANSWER 64bit block size, 128bit key size
Skipjack block size and key size? - ANSWER 64bit block size, 80bit key size
Blowfish block size and key size? - ANSWER 64bit block size, 32-448bit key
size (commonly 128, 192, or 256)
Caesar Cipher - ANSWER A substitution cipher that shifts characters a certain
number of positions in the alphabet
Multi-Alphabet Substitution Cipher - ANSWER Doing something like +1, -2,
+3, and shifting each character a different amount to the left or right. For example,
doing +1, -2, +3 with a dog would result in emj.
Vigenere Cipher - ANSWER An encryption algorithm that works by applying a
keyword to a plaintext. The keyword is aligned with the plaintext, and each letter
of the keyword determines by how many places the plaintext should be rotated. For
example, "D" signals a rotation of 3. In short is uses multiple Caesar Ciphers to
encrypt a single plaintext, making it more secure.
Playfair Cipher - ANSWER Invented by Charles Wheatstone in 1854. Encrypts
two letters instead of one; this makes it more complex. Uses a 5x5 table containing
a keyword. No more secure than any other older ciphers.
, Affine Cipher - ANSWER Any single substitution alphabet ciphers where each
letter in the alphabet is mapped to some numeric value, permuted with some
relatively simple mathematical function, and then converted back to a letter.
The formula for any basic cipher of this type is ax+b(modM), M being the size of
the alphabet, so for example Caeser cipher would be 1x+3(mod26)
Bifid Cipher - ANSWER Makes use of a grid that maps the letters into numeric
values.
homophonic cipher - ANSWER A method of encryption where single plaintext
letters can be represented by any of several different ciphertext symbols.
Scrambled Alphabet - ANSWER Each letter in the alphabet is mapped to a
random letter.
Morse Code - ANSWER a system of dots and dashes that represent the alphabet
Pig Pen Cipher - ANSWER Mono alphabetic
4 grid in a square and diagonal shape
Rail Code - ANSWER Employs a method to scramble text by writing it in a
sequence across a number of rails.
Permutations - ANSWER a complete change; a transformation
, Combination - ANSWER a grouping of items in which order does not matter
one-time pad (OTP) - ANSWER Combining plaintext with a random key to
create a ciphertext that cannot be broken mathematically.
Reed-Solomon - ANSWER A more complex data integrity scheme to not only
detect errors but also correct them
Rainbow Table Attack - ANSWER A type of password attack where an attacker
uses a set of related plaintext passwords and their hashes to crack passwords.
Dictionary Attack - ANSWER A password attack that creates encrypted
versions of common dictionary words and compares them against those in a stolen
password file.
Stream Encryption - ANSWER an encryption algorithm that breaks a plaintext
message down into single bits and encrypts 1 bit of plaintext at a time
Block Encryption - ANSWER involves breaking down plaintext messages into
fixed-size blocks before converting them into ciphertext using a key
padding - ANSWER Adding characters to cipher blocks to avoid patterns
