Name:

Decryption is restoring the plaintext from the ciphertiext. $(2)$ points$)$ True

False

Triple DEs is more secure than AES since it encrypts DES three times. $(2)$

points$)$ True $/$ False

Caesar Cipher is a type of $(4$ points$)$

A$.$ Substituion Cipher

Transposition Cipher

C$.$ Symmetric Cryptography

D$.$ Asymmetric Cryptography

What are the advantages and disadvantages of ECB $($Electronic Code

Book$)$ block cipher mode? $(4$ points$)$

A$.$ Parallel encryption of block of bits is possible, thus it is faster.

B$.$ Prone to cryptanalysis since there is a direct relationship between

plaintext and ciphertext.

C$.$ Parallel encryption is not possible since every encryption requires a

previous cipher.

D$.$ A single bit error in a block is propagated to all subsequent blocks.

The DES Algorithm has

bit key and the algorithm consists of

rounds. $($

What is Brute$-$force attack?

hy Caesar cipher is not secure$?$