WGU C839 – Intro to Cryptography Exam
Questions and Answers
2023 – 2024 (Verified Answers)
- 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 .
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?
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 - Ais 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
11.What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP
ANS A
12.DES uses keys of what size?