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