uestion 1

Block cipher uses confusion and diffusion at the same time

True

False

1 points

Question 2

In stream cipher, encryption proceeds blocks by blocks of several bytes at a time.

True

False

Question 3

In substitution cipher, only brute force attacks can be performed

True

False

Question 4

The key compression block removes the parity bits from the 64 bit key

True

False

Question 5

In public key cryptography, the algorithm proceeds with two keys

True

False

Question 6

Consider the bits 1 0 0 1 0 1. After passing through S1, the output will be:

		4
		13
		9
		3

Question 7

After IP in DES, the block is compressed to 56 bits

True

False

Question 8

Even using quantum computing, computationally secure algorithms cant be broken

True

False

Question 9

The study of principles/ methods of deciphering ciphertext without knowing key is called

		Cryptography
		Cryptoanalysis
		Cryptology
		Traffic engineering

Question 10

Consider the following bytes: 0 1 0 1 0 1 1 1 0 0 1 0 1 0 1 Assuming it is round 3 of DES key generation. The key after this round will be:

		1 0 1 0 1 0 1 1 1 0 0 1 0 1 0 1
		1 0 1 0 1 0 1 1 1 0 0 1 0 1 0 0
		0 1 0 1 0 1 1 1 0 0 1 0 1 0 1 1
		1 0 1 0 1 1 1 0 0 1 0 1 0 1 1 0