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UNIT 2 DES,BLOCK CIPHER

Authored by Saranya Raja

Computers

University - Professional Development

Used 34+ times

UNIT 2 DES,BLOCK CIPHER
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a mode of operation for the Block ciphers in cryptography?

Electronic Code Book (ECB)

Cipher Block Chaining (CBC)

Counter (CTR) mode

All of the above

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

For which of the following should EBC (Electronic Code Book) process not be used for encryption?

For large block sizes

For fixed block sizes

For small block sizes

none of the above

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following options is not correct according to the definition of the Cipher Block Chaining (CBC)?

CBC is a mode of operation for stream ciphers.

Initialization vector (IV) is used in CBC in the initial phase.

It has better resistive nature towards cryptanalysis than ECB

None of the above

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following modes of operations can be followed for both stream ciphers as well as block ciphers?

CBC

ECB

CFB

ALL THE ABOVE

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Data Encryption Standard (DES) is a __________.

Stream Cipher

Bit Cipher

Block Cipher

Substitution Cipher

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The S-Box is used to provide confusion, as it is dependent on the unknown key.

true

false

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

This is an example of

SP Networks

Feistel Cipher

Hash Algorithm

Hill Cipher

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