Page 1 of 30
WGU C839 OBJECTIVE ASSESSMENT (VERSION A & B) |
WGU C839 INTRODUCTION TO CRYPTOGRAPHY OA
ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS |
LATEST UPDATE 2026/2027 | GUARANTEED PASS.
Which encryption standard uses the same key to encrypt and decrypt
messages?
Symmetric
Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)?
Skipjack
What needs to be installed on end users' computers to allow them to
trust applications that have been digitally signed by the developer?
Sender's public key
Which algorithm implements an unbalanced Feistel cipher?
Skipjack
,Page 2 of 30
With Cipher-block chaining (CBC) what happens?
Each block of plaintext is XORed with the previous ciphertext block
before being encrypted
What is the most commonly used format for certificates?
X.509 v3
What is referenced to determine if a certificate has been revoked?
Certificate revocation list (CRL)
With Cipher feedback (CFB) what happens?
The ciphertext block is encrypted then the ciphertext produced is XOR'd
back with the plaintext to produce the current ciphertext block.
What does Output feedback (OFB) do?
, Page 3 of 30
A block cipher is converted into a stream cipher by generating a
keystream blocks, which are then XORed with the plaintext blocks to
get the ciphertext
A number that is used only one time, then discarded is called what?
Nonce
What is the largest key size that RC4 can use?
256 bits
What is the basis for the FISH algorithm?
The Lagged Fibonacci generator
Which of the following is used to encrypt email and create digital
signatures?
WGU C839 OBJECTIVE ASSESSMENT (VERSION A & B) |
WGU C839 INTRODUCTION TO CRYPTOGRAPHY OA
ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS |
LATEST UPDATE 2026/2027 | GUARANTEED PASS.
Which encryption standard uses the same key to encrypt and decrypt
messages?
Symmetric
Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)?
Skipjack
What needs to be installed on end users' computers to allow them to
trust applications that have been digitally signed by the developer?
Sender's public key
Which algorithm implements an unbalanced Feistel cipher?
Skipjack
,Page 2 of 30
With Cipher-block chaining (CBC) what happens?
Each block of plaintext is XORed with the previous ciphertext block
before being encrypted
What is the most commonly used format for certificates?
X.509 v3
What is referenced to determine if a certificate has been revoked?
Certificate revocation list (CRL)
With Cipher feedback (CFB) what happens?
The ciphertext block is encrypted then the ciphertext produced is XOR'd
back with the plaintext to produce the current ciphertext block.
What does Output feedback (OFB) do?
, Page 3 of 30
A block cipher is converted into a stream cipher by generating a
keystream blocks, which are then XORed with the plaintext blocks to
get the ciphertext
A number that is used only one time, then discarded is called what?
Nonce
What is the largest key size that RC4 can use?
256 bits
What is the basis for the FISH algorithm?
The Lagged Fibonacci generator
Which of the following is used to encrypt email and create digital
signatures?
