Symmetric Cryptography

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

• 12

• 18

• 9

• 16

The DES algorithm has a key length of ______ bits

• 128

• 56

• 192

• 256

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

• 10 bits

• 20 bits

• 56 bits

• 64 bits

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

• 128; 128 or 256

• 64; 128 or 192

• 256; 128, 192, or 256

• 128; 128, 192, or 256

Like DES, AES also uses Feistel Structure

• True

• False

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

• States

• Words

• Transposition

• Permutation

The acronym AES stands for?

• American Encryption Standard

• Advanced Encryption System

• Advanced Encryption Standard

• Advanced Encryption Standard

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

• CBC (Cipher Block Chaining)

• ECB (Electronic Code Book)

• CFB (Cipher text Feed Back)

• All of the above

DES follows

• Feistel Cipher Structure

• SP Networks

• Hash Algorithm

• Caesars Cipher