Exam (elaborations)
WGU C839 Intro To Cryptography: Questions With Accurate Solutions
- Course
- Institution
WGU C839 Intro To Cryptography: Questions With Accurate Solutions
[Show more]
Content preview
WGU C839 Intro To Cryptography: Questions WithAccurate Solutions
What type of encryption uses different keys to encrypt and decrypt the
message?
A Symmetric
B Private key
C Secure
D Asymmetric Right Ans - D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher Right Ans - A
Original, unencrypted information is referred to as ____.
A text
B plaintext
C cleantext
D ciphertext Right Ans - B
Which of the following is NOT an asymmetric system?
A PGP
B RSA
C SSL
D DES Right 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 Right 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 Right 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 Right 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 Right 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 Right Ans - 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 Right Ans - A
,What is the standard used by most digital certificates?
A X.509
B CRL
C RFC 2298
D OCSP Right Ans - A
DES uses keys of what size?
A 56 bits
B 192 bits
C 128 bits
D 64 bits Right Ans - 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 Right Ans - 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 Right Ans - A
Which of the following is a substitution cipher used by ancient Hebrew
scholars?
A Caesar
B Vigenere
C Scytale
D Atbash Right Ans - D
, Shifting each letter in the alphabet a fixed number of spaces to the right or left
is an example of what?
A Bit shifting
B Confusion
C Multi substitution
D Single substitution Right Ans - D
Which of the following most accurately defines encryption?
A changing a message so it can only be easily read by the intended recipient
B Making binary changes to a message to conceal it
C changing a message using complex mathematics
D Applying keys to plain text Right Ans - A
If you use substitution alone, what weakness is present in the resulting cipher
text?
A It is the same length as the original text
B It is easily broken with modern computers.
C It is too simple.
D Because it maintains letter and word frequency. Right Ans - D
_____ uses at least two different shifts, changing the shift with different letters
in the plain text.
A Atbash
B multi-alphabet encryption
C Scytale
D Caesar cipher Right Ans - B
____ was designed to provide built in cryptography for the clipper chip.
A Blowfish
B Skipjack
C GOST
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Zendaya. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $29.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75759 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now