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WGU C839 EXAM QUESTIONS AND ANSWERS 2024
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WGU C839 EXAM QUESTIONS AND ANSWERS 2024
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WGU C839 EXAM128/192/256 - ANSWERS-Which of the following are valid key sizes for AES
(choose three)?
3DES - ANSWERS-Which of the following algorithms uses three different keys to
encrypt the plain text?
Block Cipher - ANSWERS-AES is what type of cipher?
Asymmetric - ANSWERS-Which of the following is a type of encryption that has
two different keys. One key can encrypt the message and the other key can only
decrypt it?
RSA - ANSWERS-Which of the following is an asymmetric cipher?
The algorithm(s) needed to encrypt and decrypt a message - ANSWERS-A cipher is
defined as what
Symmetric systems - ANSWERS-AES is what type of system?
Joan's public key - ANSWERS-John is going to use RSA to encrypt a message to
Joan. What key should he use?
,They are faster - ANSWERS-What advantage do symmetric algorithms have over
asymmetric algorithms
Larger key sizes increase security - ANSWERS-Which of the following is generally
true about key sizes?
Hash - ANSWERS-A _____ is a function and is not reversible.
Diffie-Hellman (DH)/Menezes-Qu-Vanstone (MQV)/Elliptic-curve Diffie-Hellman
(ECDH) - ANSWERS-What are protocols for exchanging keys?
AES - ANSWERS-Which of the following would be the fastest: RSA/AES/DH/EC
DES - ANSWERS-Which of the following would be the weakest encryption
algorithm? RSA/AES/DES/EC
256 - ANSWERS-What is the largest key size that AES can use?
AES - ANSWERS-All of the following are key exchange protocols except for____
DH/AES/MQV/ECDH
RSA - ANSWERS-What encryption algorithm relies on the inability to factor large
prime numbers?
, Letter/word frequency is maintained - ANSWERS-Using substitution without
transposition leads to what weakness?
Skipjack - ANSWERS-What algorithm does the clipper chip use?
80 bit - ANSWERS-What size key does Skipjack use?
64 - ANSWERS-What size block does Skipjack use?
The message is divided into blocks and each block is encrypted separately. This is
the most basic mode for symmetric encryption. - ANSWERS-With Electronic
codebook (ECB) what happens
Symmetric - ANSWERS-Which encryption standard uses the same key to encrypt
and decrypt messages?
Skipjack - ANSWERS-Which algorithm is designated as a Type 2 product by the
National Security Agency (NSA)?
X.509 v3 - ANSWERS-What is the most commonly used format for certificates?
Certificate revocation list (CRL) - ANSWERS-What is referenced to determine if a
certificate has been revoked?
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