WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
WGU C839 - INTRO TO
CRYPTOGRAPHY EXAM STUDY
GUIDE. GRADED A+.
QUESTIONS AND 100%
VERIFIED ANSWERS. LATEST
2025/2026 UPDATE
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher - Answer A
Original, unencrypted information is referred to as .
A text
B plaintext
C cleantext
D ciphertext - Answer B
Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES - Answer D
,WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
In order for User A to send User B an encrypted message that only User B can
read, User A must encrypt message with which of the following keys?
A User A's public key
B User A's private key
C User B's public key
D User B's private key - Answer C
The greatest weakness with symmetric algorithms is .
A They are less secure than asymmetric
B The problem of key exchange
C They are slower than asymmetric
D The problem of generating keys - Answer B
,WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
Which of the following is generally true about block sizes?
A Smaller block sizes increase security
B Block sizes must be more than 256 bits to be secure
C Block size is irrelevant to security
D Larger block sizes increase security - Answer D
A is a function that takes a variable-size input m and returns a
fixed-size string.
A Symmetric cipher
B Hash
C Asymmetric cipher
D Feistel - Answer B
Which of the following is a cryptographic protocol that allows two parties to
establish a shared key over an insecure channel?
A Elliptic Curve
B RSA
C MD5
D Diffie-Hellman - Answer D
A is a digital representation of information that identifies
you as a relevant entity by a trusted third party?
A Digital Signature
B Hash
C Ownership stamp
D Digest - Answer A
What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP - Answer A
DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
, WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
D 64 bits - Answer A
Which of the following is NOT a key size used by AES?
A 512 bits
B 128 bits
EXAM STUDY GUIDE
WGU C839 - INTRO TO
CRYPTOGRAPHY EXAM STUDY
GUIDE. GRADED A+.
QUESTIONS AND 100%
VERIFIED ANSWERS. LATEST
2025/2026 UPDATE
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher - Answer A
Original, unencrypted information is referred to as .
A text
B plaintext
C cleantext
D ciphertext - Answer B
Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES - Answer D
,WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
In order for User A to send User B an encrypted message that only User B can
read, User A must encrypt message with which of the following keys?
A User A's public key
B User A's private key
C User B's public key
D User B's private key - Answer C
The greatest weakness with symmetric algorithms is .
A They are less secure than asymmetric
B The problem of key exchange
C They are slower than asymmetric
D The problem of generating keys - Answer B
,WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
Which of the following is generally true about block sizes?
A Smaller block sizes increase security
B Block sizes must be more than 256 bits to be secure
C Block size is irrelevant to security
D Larger block sizes increase security - Answer D
A is a function that takes a variable-size input m and returns a
fixed-size string.
A Symmetric cipher
B Hash
C Asymmetric cipher
D Feistel - Answer B
Which of the following is a cryptographic protocol that allows two parties to
establish a shared key over an insecure channel?
A Elliptic Curve
B RSA
C MD5
D Diffie-Hellman - Answer D
A is a digital representation of information that identifies
you as a relevant entity by a trusted third party?
A Digital Signature
B Hash
C Ownership stamp
D Digest - Answer A
What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP - Answer A
DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
, WGU C839 - INTRO TO CRYPTOGRAPHY
EXAM STUDY GUIDE
D 64 bits - Answer A
Which of the following is NOT a key size used by AES?
A 512 bits
B 128 bits
