Explore topic-wise MCQs in Cryptography and Network Security.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Cryptography and Network Security knowledge and support exam preparation. Choose a topic below to get started.

1.

There is an addition of round key before the start of the AES round algorithms.

A. True
B. False
Answer» B. False
Discussion
2.

Which of the 4 operations are false for each round in the AES algorithmi) Substitute Bytesii) Shift Columnsiii) Mix Rowsiv) XOR Round Key

A. i) only
B. ii) iii) and iv)
C. ii) and iii)
D. only iv)View Answer
Answer» C. ii) and iii)
Discussion
3.

For the AES-128 algorithm there are __________ similar rounds and _________ round is different.

A. 2 pair of 5 similar rounds ; every alternate
B. 9 ; the last
C. 8 ; the first and last
D. 10 ; no
Answer» C. 8 ; the first and last
Discussion
4.

In AES the 4×4 bytes matrix key is transformed into a keys of size __________

A. 32 words
B. 64 words
C. 54 words
D. 44 words
Answer» E.
Discussion
5.

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

A. States
B. Words
C. Transitions
D. Permutations
Answer» B. Words
Discussion
6.

How many rounds does the AES-256 perform?

A. 10
B. 12
C. 14
D. 16
Answer» D. 16
Discussion
7.

IN_AES_THE_4‚ÄÖ√†√∂‚Àւ•4_BYTES_MATRIX_KEY_IS_TRANSFORMED_INTO_A_KEYS_OF_SIZE___________?$#

A. 32 words
B. 64 words
C. 54 words
D. 44 words
Answer» E.
Discussion
8.

Which of the 4 operations are false for each round in the AES algorithm$

A. Substitute Bytes
B. Shift Columns
C. Mix Rows
D. XOR Round Key
Answer» C. Mix Rows
Discussion
9.

For_the_AES-128_algorithm_there_are____________similar_rounds_and___________round_is_different.$

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

i)_only

A. ii) iii) and iv)
B. ii) and iii)
C. only iv)
Answer» B. ii) and iii)
Discussion
11.

The 4√ó4 byte matrices in the AES algorithm are calle?#

A. States
B. Words
C. Transitions
D. Permutations
Answer» B. Words
Discussion
12.

What is the expanded key size of AES-192?

A. 44 words
B. 60 words
C. 52 words
D. 36 words
Answer» D. 36 words
Discussion
13.

How many rounds does the AES-192 perform?

A. 10
B. 12
C. 14
D. 16
Answer» C. 14
Discussion
14.

Which algorithm among- MARS, Blowfish, RC6, Rijndael and Serpent -was chosen as the AES algorithm?

A. MARS
B. Blowfish
C. RC6
D. Rijndael
Answer» B. Blowfish
Discussion
15.

Which one of the following is not a cryptographic algorithm- JUPITER, Blowfish, RC6, Rijndael and Serpent?

A. JUPITER
B. Blowfish
C. Serpent
D. Rijndael
Answer» B. Blowfish
Discussion
16.

Like DES, AES also uses Feistel Structure.

A. True
B. False
Answer» C.
Discussion
17.

AES uses a ____________ bit block size and a key size of __________ bits.

A. 128; 128 or 256
B. 64; 128 or 192
C. 256; 128, 192, or 256
D. 128; 128, 192, or 256
Answer» E.
Discussion