AES

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

Like DES, AES also uses Feistel Structure.

• a) True

• b) False

How many rounds does the AES-192 perform?

• a) 10

• b) 12

• c) 14

• d) 16

How many rounds does the AES-256 perform?

• a) 10

• b) 12

• c) 14

• d) 16

What is the expanded key size of AES-192?

• a) 44 words

• b) 60 words

• c) 52 words

• d) 36 words

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

• a) States

• b) Words

• c) Transitions

• d) Permutations

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

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

• a) True

• b) False

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

Which one of the following is not a possible key length for the Advanced Encryption Standard Rijndael cipher?

• A. 56 bits

• B. 128 bits

• C. 192 bits

• D. 256 bits