WGU COURSE C839 - INTRO
TO CRYPTOGRAPHY
QUIZLET BY BRIAN
MACFARLANE/293
QUESTIONS AND ANSWERS
(A+)
What type of encryption uses different keys to
encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric - =D
-The most widely used asymmetric encryption
algorithm is what?
A RSA
B Vigenère
C DES
D Caesar Cipher - =A
-Original, unencrypted information is referred to as
____.
A text
,B plaintext
C clean text
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?
An 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?
56 bits
B 192 bits
C 128 bits
D 64 bits - =A
-Which of the following is NOT a key size used by
AES?
512 bits
B 128 bits
C 192 bits
D 256 bits - =A
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