WGU C839 EXAM 100 REAL EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED
ANSWERS)|AGRADE
Original, unencrypted information is referred to as . A text B plaintext C cleantext D ciphertext B Which of the following is NOT an asymmetric system? A PGP B RSA C SSL D DES 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 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
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
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 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 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
A
What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP
A
DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits
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
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
A
Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere