Question 1

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 2

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 3

Which of the following algorithms uses three different keys to encrypt the plain text?

Options :

A : 3DES

B : Skipjack

C : Blowfish

D : AES

Answer: A

Question 4

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

Question 5

Algorithm that was chosen for the Data Encryption Standard, which was altered and renamed Data Encryption Algorithm.

Options :

A : Blowfish

B : Rijndael

C : El Gamal

D : Lucifer

Answer: D

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