100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Cryptography Final UPDATED Actual Exam Questions and CORRECT Answers $9.99   Add to cart

Exam (elaborations)

Cryptography Final UPDATED Actual Exam Questions and CORRECT Answers

 4 views  0 purchase
  • Course
  • Cryptography
  • Institution
  • Cryptography

Cryptography Final UPDATED Actual Exam Questions and CORRECT Answers Cryptology - CORRECT ANSWER- is the study of cryptanalysis and cryptography cryptanalysis is used - CORRECT ANSWER- to find some insecurity in a cryptography scheme CIA Triad - CORRECT ANSWER- Confidentiality, Integrity, Ava...

[Show more]

Preview 3 out of 18  pages

  • October 5, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Cryptography
  • Cryptography
avatar-seller
MGRADES
Cryptography Final UPDATED Actual
Exam Questions and CORRECT Answers
Cryptology - CORRECT ANSWER✔✔- is the study of cryptanalysis and cryptography



cryptanalysis is used - CORRECT ANSWER✔✔- to find some insecurity in a cryptography
scheme


CIA Triad - CORRECT ANSWER✔✔- Confidentiality, Integrity, Availability



According to x.800 the architecture of security is - CORRECT ANSWER✔✔- the three
aspects of information security
a) security attack
b) security mechanism (control)
c) security service


an intelligent threat is called - CORRECT ANSWER✔✔- an attack, a deliberate attempt to
evade security services and violate the security policy of a system.


the passive attack type is: - CORRECT ANSWER✔✔- Release of message contents


protection agains denial by one of the entities involved in a communication (origin,
destination)is called a: - CORRECT ANSWER✔✔- Non-Repudation



Conversion of cypher text to plaintext is - CORRECT ANSWER✔✔- decryption


the information known to a cryptanalyst is known plaintext attack is - CORRECT
ANSWER✔✔- encryption algorithm
cipher text
one or more plaintext-cyphertext pairs formed with secrete key.

,what is the difference between mono alphabetic and poly alphabetic cipher - CORRECT
ANSWER✔✔- The monoalphabetic cipher is a permutation of a finite set of elements S is an
ordered sequence of all the elements of S, with each element appearing exactly once. In
mono- the relationship between cipher text and plain text is one to one.
The polyalphabetic cipher improves on this by using different monoalphabetic substitutions
as one proceeds through the plaintext. The polyalphabetic cipher is more complex. In a poly-
one letter of plain text can be mapped to many letters of cipher text.


the method of Caesar cipher is - CORRECT ANSWER✔✔- substitution



what is the encryption algorithm for Vigenere cipher? - CORRECT ANSWER✔✔- Ci = (pi
+ ki) mod 26


what is the decryption algorithm for vernam cipher? - CORRECT ANSWER✔✔- ci = pi⊕ki
where pi = ith binary digit of plaintext ki = ith binary digit of key ci = ith binary digit of
ciphertext


what is the rail fence transposition technique? - CORRECT ANSWER✔✔- the message is
written in a rectangle, row by row, and read the message off, column by column, but permute
the order of the column, the order of the columns then becomes the key to the algorithm.


give an example for play fair cipher - CORRECT ANSWER✔✔- The keyword is
MONARCHY
Message = Move forward
Plaintext = mo ve fo rw ar dx
mo -> ON; ve -> UF; fo -> PH, etc
Ciphertext = ON UF PH NZ RM BZ


how many rounds does the AES-192 perform? - CORRECT ANSWER✔✔- 12



AES uses a _______ bit block size - CORRECT ANSWER✔✔- 128



the leftmost 4 bits in s-box represents the following value - CORRECT ANSWER✔✔- row

, the number of s-boxes in AES - CORRECT ANSWER✔✔- 1



the number of stages in each round of AES includes - CORRECT ANSWER✔✔- 4



the number of subways in key expansion is - CORRECT ANSWER✔✔- the number of
rounds +1


AES algorithm is derived by - CORRECT ANSWER✔✔- Rijndael



AES is faster then 3DES - CORRECT ANSWER✔✔- true



AES follows Fiestel structure - CORRECT ANSWER✔✔- false



the stages defined in AES encryption are - CORRECT ANSWER✔✔- substitution bytes
shift rows
mixed columns
and add round key


GCD(a,b) is the same as GCD(| a |, | b |) - CORRECT ANSWER✔✔- true


calculate the GCD of 1160718174 and 316258250 using Euclidean algorithm - CORRECT
ANSWER✔✔- 1160718174 = 3(316258250) + 211943424
316258250 = 211943424 + 104314826
211943424 =2(104314826) + 3313772
104314826 = 31(3313772) + 1587894
3313772 =2(1587894 )+ 137984
1587894 =11(137984 )+ 70,070
137984 = 70070 + 67914
70070 = 67914 + 2156

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 MGRADES. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $9.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

81989 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$9.99
  • (0)
  Add to cart