WGU Course C839 - Intro to Cryptography
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric - CORRECT ANSWER -D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher - CORRECT ANSWER -A
Original, unencrypted information is referred to as ____.
A text
B plaintext
C cleantext
D ciphertext - CORRECT ANSWER -B
Which of the following is NOT an asymmetric system?
A PGP
,B RSA
C SSL
D DES - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER -A
What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP - CORRECT ANSWER -A
, DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits - CORRECT 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 - CORRECT 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 - CORRECT ANSWER -A
Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere
C Scytale
D Atbash - CORRECT ANSWER -D
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric - CORRECT ANSWER -D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher - CORRECT ANSWER -A
Original, unencrypted information is referred to as ____.
A text
B plaintext
C cleantext
D ciphertext - CORRECT ANSWER -B
Which of the following is NOT an asymmetric system?
A PGP
,B RSA
C SSL
D DES - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT ANSWER -A
What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP - CORRECT ANSWER -A
, DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits - CORRECT 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 - CORRECT 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 - CORRECT ANSWER -A
Which of the following is a substitution cipher used by ancient Hebrew scholars?
A Caesar
B Vigenere
C Scytale
D Atbash - CORRECT ANSWER -D
