Question 1

If you want to decrypt using DES, you should...

Question 1 options:

	Apply DES the other way around.
	Reverse the rounds.
	Reverse the key schedule.
	Reverse the key.
	Reverse the order of the plaintext.
	Reverse the order of the ciphertext.

Question 2

If you want to reverse the key schedule, what Transform you need to apply first?

Question 2 options:

	Transform 1
	Transform 16
	Transform 56
	Transform 64

Question 3

Select the statements that are true.

Question 3 options:

	DES is secure for cryptographic applications.
	DES was "crack" in 1998.
	The key space of DES is big enough.
	It is relatively cheap, for the average american, to "crack" DES.
	Triple DES encrypts the plain text with the same key, three times.
	Triple DES encrypts the plain text with three distinct keys, three times.

Question 4

Select the statements that are true.

Question 4 options:

	Triple DES can replace DES
	DES replaces Triple DES
	AES replaces DES.
	DES replaces AES
	The key space of triple DES and DES are the same.
	The key space of AES is larger than DES