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

In a Feistel cipher, the two halves of the block are swapped in each round. What does this provide?

Options :

A : Avalanche

B : Confusion

C : Substitution

D : Diffusion

Answer: B

Question 3

Which of the following areas is considered a strength of symmetric key cryptography when compared with asymmetric algorithms?

Options :

A : Speed

B : Key distribution

C : Security

D : Scalability

Answer: A

Question 4

Which of the following asymmetric algorithms is described by U.S. Patent 5,231,668 and FIPS 186

Options :

A : RSA

B : RC4

C : DSA

D : AES

Answer: C

Question 5

Which of the following is an asymmetric algorithm that was first publically described in 1977?

Options :

A : RSA

B : Twofish

C : Elliptic Curve

D : DESX

Answer: A