Page 1 of 71
WGU C839 OBJECTIVE ASSESSMENT FINAL
EXAM NEWEST 2025/2026 COMPLETE 300
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW VERSION!!
OBJECTIVE ASSESSMENT FINAL
What does the Online Certificate Status Protocol (OCSP) provide?
A Revoked certificates
B Hashing
C VPN connectivity
D Encryption - ANSWER-A
In terms of cryptanalysis, what does it mean to break a cipher?
A finding a method to decrypt a message that is at least twice as
efficient as brute force
B trying every possible key until you can decrypt the message
,Page 2 of 71
C deploying an algorithm that uses a 228 bit key
D finding any method to decrypt the message that is more efficient than
brute force - ANSWER-D
An authentication method that periodically re-authenticates the client
by establishing a hash that is then resent from the client is called
______.
A PAP
B CHAP
C SPAP
D EAP - ANSWER-B
What is a TGS?
A The server that grants Kerberos tickets
B protocol for encryption
C protocol for key exchange
D The server that escrows keys - ANSWER-A
What is Kerchoff's principle?
,Page 3 of 71
A A minimum key size of 256 bits is necessary for security.
B Both algorithm and key should be kept secret.
C A minimum of 15 rounds is needed for a Feistel cipher to be secure.
D Only the key needs to be secret, not the actual algorithm. - ANSWER-
D
Which of the following is a fundamental principle of cryptography that
holds that the algorithm can be publically disclosed without damaging
security?
A Babbage's principle
B Kerkchoff's principle
C Vigenere's principle
D Shamir's principle - ANSWER-B
A process that puts a message into the least significant bits of a binary
file is called what?
A Symmetric cryptography
B Masking
C Steganography
, Page 4 of 71
D Asymmetric cryptography - ANSWER-C
If you wished to see a list of revoked certificates from a CA, where
would you look?
A CRL
B CA
C RFC
D RA - ANSWER-A
Which of the following is generally true about block ciphers?
A Secret block ciphers should be trusted.
B Block ciphers permute the bits of the input plaintext.
C The plaintext and ciphertext are always the same size.
D A block cipher is an encryption function for variable-size blocks of
data. - ANSWER-C
What does the OCSP protocol provide?
A encryption
B VPN connectivity
WGU C839 OBJECTIVE ASSESSMENT FINAL
EXAM NEWEST 2025/2026 COMPLETE 300
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||BRAND NEW VERSION!!
OBJECTIVE ASSESSMENT FINAL
What does the Online Certificate Status Protocol (OCSP) provide?
A Revoked certificates
B Hashing
C VPN connectivity
D Encryption - ANSWER-A
In terms of cryptanalysis, what does it mean to break a cipher?
A finding a method to decrypt a message that is at least twice as
efficient as brute force
B trying every possible key until you can decrypt the message
,Page 2 of 71
C deploying an algorithm that uses a 228 bit key
D finding any method to decrypt the message that is more efficient than
brute force - ANSWER-D
An authentication method that periodically re-authenticates the client
by establishing a hash that is then resent from the client is called
______.
A PAP
B CHAP
C SPAP
D EAP - ANSWER-B
What is a TGS?
A The server that grants Kerberos tickets
B protocol for encryption
C protocol for key exchange
D The server that escrows keys - ANSWER-A
What is Kerchoff's principle?
,Page 3 of 71
A A minimum key size of 256 bits is necessary for security.
B Both algorithm and key should be kept secret.
C A minimum of 15 rounds is needed for a Feistel cipher to be secure.
D Only the key needs to be secret, not the actual algorithm. - ANSWER-
D
Which of the following is a fundamental principle of cryptography that
holds that the algorithm can be publically disclosed without damaging
security?
A Babbage's principle
B Kerkchoff's principle
C Vigenere's principle
D Shamir's principle - ANSWER-B
A process that puts a message into the least significant bits of a binary
file is called what?
A Symmetric cryptography
B Masking
C Steganography
, Page 4 of 71
D Asymmetric cryptography - ANSWER-C
If you wished to see a list of revoked certificates from a CA, where
would you look?
A CRL
B CA
C RFC
D RA - ANSWER-A
Which of the following is generally true about block ciphers?
A Secret block ciphers should be trusted.
B Block ciphers permute the bits of the input plaintext.
C The plaintext and ciphertext are always the same size.
D A block cipher is an encryption function for variable-size blocks of
data. - ANSWER-C
What does the OCSP protocol provide?
A encryption
B VPN connectivity
