Question 1

Denis is looking at an older system that uses DES encryption. A colleague has told him that DES is insecure due to a small key size. What is the key length used for DES?

Options :

A :

64

B : 128

C : 56

D : 256

Answer: C

Question 2

What is the largest key size that AES can use?

Options :

A : 128

B : 256

C : 512

D : 56

Answer: B

Question 3

Cryptographic hashes are often used for message integrity and password storage. It is important to understand the common properties of all cryptographic hashes. What is not true about a hash?

Options :

A : Few collisions

B :

Variable length input

C : Reversible

D : Fixed length output

Answer: C

Question 4

Symmetric algorithm. Designed by James Massey and Xuejia Lai. Operates on 64 bit blocks and has a 128 bit key. Consists of 8 identical transformations each round and an output transformation.

Options :

A : IDEA

B : RSA

C : CAST

D : DES

Answer: A

Question 5

Which one of the following is an example of a symmetric key algorithm?

Options :

A : RSA

B : Rijndael

C : Diffie-Hellman

D : ECC

Answer: B

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