Question 1

In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via

Accepted Answer

A) scaling of the existing bits 
B) duplication of the existing bits 
C) addition of zeros 
D) addition of ones 
A) scaling of the existing bits 
B) duplication of the existing bits 
C) addition of zeros 
D) addition of ones A

Question 2

If the key is 110100001, the output of the SP network for the plaintext: 101110001 is

Accepted Answer

A) 110100011 
B) 110101110 
C) 10110111 
D) 11111010 
A) 110100011 
B) 110101110 
C) 10110111 
D) 11111010 B

Question 3

Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?

Accepted Answer

A) 11101010 
B) 11011011 
C) 1101000 
D) 10101111 
A) 11101010 
B) 11011011 
C) 1101000 
D) 10101111 A

Question 4

The 4×4 byte matrices in the AES algorithm are called

Accepted Answer

A) states 
B) words 
C) transitions 
D) permutations 
A) states 
B) words 
C) transitions 
D) permutations

Question 5

The number of unique substitution boxes in DES after the 48 bit XOR operation are

Accepted Answer

A) 8 
B) 4 
C) 6 
D) 12 
A) 8 
B) 4 
C) 6 
D) 12

Question 6

__________is not a binary operation on the set of natural numbers.

Accepted Answer

A) addition 
B) product 
C) difference 
D) none 
A) addition 
B) product 
C) difference 
D) none

Question 7

For the AES-128 algorithm there are__________ similar rounds and_________round is different.

Accepted Answer

A) 2 pair of 5 similar rounds ; every alternate 
B) 9 ; the last 
C) 8 ; the first and last 
D) 10 ; no 
A) 2 pair of 5 similar rounds ; every alternate 
B) 9 ; the last 
C) 8 ; the first and last 
D) 10 ; no

Question 8

The Initial Permutation table/matrix is of size

Accepted Answer

A) 16×8 
B) 4×8 
C) 12×8 
D) 8×8 
A) 16×8 
B) 4×8 
C) 12×8 
D) 8×8

Question 9

What is the size of the key in the SDES algorithm?

Accepted Answer

A) 24 bits 
B) 16 bits 
C) 20 bits 
D) 10 bits 
A) 24 bits 
B) 16 bits 
C) 20 bits 
D) 10 bits

Question 10

What is the expanded key size of AES-192?

Accepted Answer

A) 44 words 
B) 60 words 
C) 52 words 
D) 36 words 
A) 44 words 
B) 60 words 
C) 52 words 
D) 36 words

Question 11

Which one of the following RC4 algorithm not used in?

Accepted Answer

A) ssl 
B) tls 
C) ftp 
D) wep 
A) ssl 
B) tls 
C) ftp 
D) wep

Question 12

The DES Algorithm Cipher System consists of _________rounds (iterations) each with a round key

Accepted Answer

A) 9 
B) 12 
C) 18 
D) 16 
A) 9 
B) 12 
C) 18 
D) 16

Question 13

Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1?

Accepted Answer

A) 10100100 
B) 1011011 
C) 1101000 
D) 10100111 
A) 10100100 
B) 1011011 
C) 1101000 
D) 10100111

Question 14

The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is

Accepted Answer

A) 1100111 
B) 1010 
C) 11111111 
D) 1101101 
A) 1100111 
B) 1010 
C) 11111111 
D) 1101101

Question 15

In the DES algorithm the round key is_________bit and the Round Input is__________bits

Accepted Answer

A) 48, 32 
B) 64,32 
C) 56, 24 
D) 32, 32 
A) 48, 32 
B) 64,32 
C) 56, 24 
D) 32, 32

Question 16

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

Accepted Answer

A) a. cbc (cipher block chaining) 
B) ecb (electronic code book) 
C) a. cfb (cipher text feed back) 
D) all of the above 
A) a. cbc (cipher block chaining) 
B) ecb (electronic code book) 
C) a. cfb (cipher text feed back) 
D) all of the above

Question 17

If the block size is 's', how many affine transformations are possible ?

Accepted Answer

A) 2s (2s-1)(2s-1)(2s-12) ………(2s-1(s-1)) 
B) 2s (2s-1)(2s-2)(2s-22) ………(2s-2(s-2)) 
C) 2ss (2s-1)(2s-2)(2s-22) ………(2s-2(s-1)) 
D) 2s (2s-1)(2s-2)(2s-22) ………(2s-2(s-3)) 
A) 2s (2s-1)(2s-1)(2s-12) ………(2s-1(s-1)) 
B) 2s (2s-1)(2s-2)(2s-22) ………(2s-2(s-2)) 
C) 2ss (2s-1)(2s-2)(2s-22) ………(2s-2(s-1)) 
D) 2s (2s-1)(2s-2)(2s-22) ………(2s-2(s-3))

Question 18

What is the number of possible 3 x 3 affine cipher transformations

Accepted Answer

A) 168 
B) 840 
C) 1024 
D) 1344 
A) 168 
B) 840 
C) 1024 
D) 1344

Question 19

Every cyclic group is_______.

Accepted Answer

A) a group with finite order 
B) a group with prime order 
C) a non abelian group 
D) an abelian group 
A) a group with finite order 
B) a group with prime order 
C) a non abelian group 
D) an abelian group

Question 20

Which of the following is group under multiplication?

Accepted Answer

A) q 
B) q-{0} 
C) q-{1} 
D) q-{0,1} 
A) q 
B) q-{0} 
C) q-{1} 
D) q-{0,1}

In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via

If the key is 110100001, the output of the SP network for the plaintext: 101110001 is

Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?

The 4×4 byte matrices in the AES algorithm are called

The number of unique substitution boxes in DES after the 48 bit XOR operation are

__________is not a binary operation on the set of natural numbers.

For the AES-128 algorithm there are__ similar rounds and_round is different.

The Initial Permutation table/matrix is of size

What is the size of the key in the SDES algorithm?

What is the expanded key size of AES-192?

Which one of the following RC4 algorithm not used in?

The DES Algorithm Cipher System consists of _________rounds (iterations) each with a round key

Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1?

The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is

In the DES algorithm the round key is_bit and the Round Input is__bits

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

If the block size is 's', how many affine transformations are possible ?

What is the number of possible 3 x 3 affine cipher transformations

Every cyclic group is_______.

Which of the following is group under multiplication?

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Exam 3: Cryptography Key, Algorithm, and Mode of Operation

In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via

If the key is 110100001, the output of the SP network for the plaintext: 101110001 is

Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?

The 4×4 byte matrices in the AES algorithm are called

The number of unique substitution boxes in DES after the 48 bit XOR operation are

__________is not a binary operation on the set of natural numbers.

For the AES-128 algorithm there are__________ similar rounds and_________round is different.

The Initial Permutation table/matrix is of size

What is the size of the key in the SDES algorithm?

What is the expanded key size of AES-192?

Which one of the following RC4 algorithm not used in?

The DES Algorithm Cipher System consists of _________rounds (iterations) each with a round key

Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1?

The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is

In the DES algorithm the round key is_________bit and the Round Input is__________bits

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

If the block size is 's', how many affine transformations are possible ?

What is the number of possible 3 x 3 affine cipher transformations

Every cyclic group is_______.

Which of the following is group under multiplication?

Cryptography and Network Security

Cryptography and Encryption

Cryptography and Encryption Techniques

Cryptography, Elliptic Curves, and Email Security

Intrusion and Emailinternet Security Techniques

Cybersecurity Concepts: Sftp, Firewall, Malware, and Virus Protection

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For the AES-128 algorithm there are__ similar rounds and_round is different.

In the DES algorithm the round key is_bit and the Round Input is__bits