WGU COURSE C839 - INTRO TO CRYPTOGRAPHY QUESTIONS
AND ANSWERS LATEST 2026 ALREADY PASSED
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric -ANSWER-D
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
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
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
D 64 bits -ANSWER-A
Which of the following is NOT a key size used by AES?
A 512 bits
B 128 bits
C 192 bits
D 256 bits -ANSWER-A
Which of the following was a multi alphabet cipher widely used from the 16th century
(1553) to the early 20th century (1900s)?
A Vigenere
B Caesar
C Atbash
D Scytale -ANSWER-A
Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere
C Scytale
D Atbash -ANSWER-D
Shifting each letter in the alphabet a fixed number of spaces to the right or left is an example
of what?
AND ANSWERS LATEST 2026 ALREADY PASSED
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric -ANSWER-D
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
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
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
D 64 bits -ANSWER-A
Which of the following is NOT a key size used by AES?
A 512 bits
B 128 bits
C 192 bits
D 256 bits -ANSWER-A
Which of the following was a multi alphabet cipher widely used from the 16th century
(1553) to the early 20th century (1900s)?
A Vigenere
B Caesar
C Atbash
D Scytale -ANSWER-A
Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere
C Scytale
D Atbash -ANSWER-D
Shifting each letter in the alphabet a fixed number of spaces to the right or left is an example
of what?
