BlockCipher-AES

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

• 128; 128 or 256

• 256; 128, 192, or 256

• 64; 128 or 192

• 128; 128, 192, or 256

How many rounds does the AES-192 perform?

• 10

• 12

• 14

• 16

How many rounds does the AES-256 perform?

• 10

• 12

• 14

• 16

What is the expanded key size of AES-192?

• 44

• 52

• 60

• 36

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

• States

• Transitions

• Words

• Permutations

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

• Electronic Code Book (ECB)

• Counter (CTR) mode

• Cipher Block Chaining (CBC)

• All of the above

In the AES-128 algorithm there are mainly __________ similar rounds and _________ round is different from other round.

• 5 similar rounds having 2 pair ; every alternate

• 8 ; the first and last

• 9 ; the last

• 10 ; no

Which of the following is an advantage of using a Block Cipher over a Stream Cipher?

• Block Cipher can be used with longer keys.

• Block Cipher is faster than Stream Cipher.

• Block Cipher is more secure than Stream Cipher.

• Block Cipher can encrypt data bit-by-bit.

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

• True

• False

The AES technique uses the ______ algorithm.

• Kryptotel Algorithm

• Twofish Algorithm

• Rijndael Algorithm

• Blowfish Algorithm