WGU COURSE C839 - INTRO TO
CRYPTOGRAPHY EXAM QUESTIONS
AND DETAILED ANSWERS. EXPERT
VERIFIED FOR GUARANTEED PASS.
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric - ANS D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher - ANS A
Original, unencrypted information is referred to as ____.
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,A text
B plaintext
C cleantext
D ciphertext - ANS B
Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES - ANS 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 - ANS 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 - ANS B
Which of the following is generally true about block sizes?
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,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 - ANS 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 - ANS 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 - ANS 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 - ANS A
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, What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP - ANS A
DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits - ANS 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 - ANS 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 - ANS A
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
CRYPTOGRAPHY EXAM QUESTIONS
AND DETAILED ANSWERS. EXPERT
VERIFIED FOR GUARANTEED PASS.
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric - ANS D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher - ANS A
Original, unencrypted information is referred to as ____.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,A text
B plaintext
C cleantext
D ciphertext - ANS B
Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES - ANS 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 - ANS 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 - ANS B
Which of the following is generally true about block sizes?
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
,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 - ANS 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 - ANS 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 - ANS 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 - ANS A
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP - ANS A
DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits - ANS 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 - ANS 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 - ANS A
4 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
