INTRO TO CRYPTOGRAPHY / WGU COURSE
C839 (2026) | COMPLETE STUDY GUIDE &
PRACTICE QUESTIONS
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales Included
,What type of encryption uses different keys to encrypt D
and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric
The most widely used asymmetric encryption algorithm A
is what?
A RSA
B Vigenere
C DES
D Caesar Cipher
Original, unencrypted information is referred to as ____. B
A text
B plaintext
C cleantext
D ciphertext
,Which of the following is NOT an asymmetric system? D
A PGP
B RSA
C SSL
D DES
In order for User A to send User B an encrypted C
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
, The greatest weakness with symmetric algorithms is B
_____.
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
Which of the following is generally true about block D
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
A _____ is a function that takes a variable-size input m and B
returns a fixed-size string.
A Symmetric cipher
B Hash
C Asymmetric cipher
D Feistel
C839 (2026) | COMPLETE STUDY GUIDE &
PRACTICE QUESTIONS
| GRADED A+ | GUARANTEED SUCCESS
Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales Included
,What type of encryption uses different keys to encrypt D
and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric
The most widely used asymmetric encryption algorithm A
is what?
A RSA
B Vigenere
C DES
D Caesar Cipher
Original, unencrypted information is referred to as ____. B
A text
B plaintext
C cleantext
D ciphertext
,Which of the following is NOT an asymmetric system? D
A PGP
B RSA
C SSL
D DES
In order for User A to send User B an encrypted C
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
, The greatest weakness with symmetric algorithms is B
_____.
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
Which of the following is generally true about block D
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
A _____ is a function that takes a variable-size input m and B
returns a fixed-size string.
A Symmetric cipher
B Hash
C Asymmetric cipher
D Feistel
