Question 1

A type of frequency analysis used to attack polyalphabetic substitution ciphers. It's used to try to discover patterns and use that information to decrypt the cipher.

Options :

A : Kasiski Method

B : Integral Cryptanalysis

C : Information Deduction

D : Birthday Attack

Answer: A

Question 2

Fred is using an operating system that stores all passwords as an MD5 hash. What size is an MD5 message digest (hash)?

Options :

A : 256

B : 512

C : 160

D : 128

Answer: D

Question 3

A _____ is a function is not reversible.

Options :

A : Block Cipher

B : Stream cipher

C : Hash

D : Asymmetric cipher

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

What is the largest key size that AES can use?

Options :

A : 128

B : 256

C : 512

D : 56

Answer: B