Module 8 - Cryptographic Methods - Q&A

Question 1

How many rounds does DES use in its encryption process?
A. 48
B. 32
C. 1
D. 16

Answer 1

D. DES uses 16 rounds of encryption.

Question 2

Which of the following algorithms won the competition to become the Advanced Encryption Standard?
A. Rijndael
B. MARS
C. RC6
D. Twofish

Answer 2

A. Rijndael won the NIST-sponsored competition to become the Advanced Encryption Standard.

Question 3

Which of the following is a symmetric streaming algorithm?
A. 3DES
B. RC4
C. AES
D. Blowfish

Answer 3

B. RC4 is a symmetric streaming algorithm.

Question 4

Which of the following can be used to assure both authenticity and integrity of a message?
A. RIPEMD
B. HMAC-SHA2
C. AES
D. Twofish

Answer 4

B. HMAC-SHA2 is a method that would use the SHA-2 hashing algorithm, as well as a symmetric key, to produce a Message Authentication Code, ensuring both authenticity and integrity of the message.

Question 5

Which of the following asymmetric algorithms uses a maximum key size of 4,096 bits?
A. AES
B. Diffie-Hellman
C. RSA
D. ECC

Answer 5

C. RSA uses key sizes between 1,024 and 4,096 bits.

Question 6

Which of the following asymmetric algorithms is widely used on mobile devices because of its low computational power requirements?
A. ECC
B. ElGamal
C. Diffie-Hellman
D. GPG

Answer 6

A. Elliptic Curve Cryptography (ECC) is an asymmetric algorithm widely found in use on mobile devices because it requires low amounts of computational power.

Question 7

Which of the following algorithms is based upon computing discrete logarithms?
A. Diffie-Hellman
B. RSA
C. ECC
D. ElGamal

Answer 7

D. The ElGamal asymmetric algorithm is based upon mathematical problems involving computing discrete logarithms.

Question 8

All of these are characteristics of the hashing process, except:
A. Cannot be decrypted
B. Used to assure integrity
C. Uses AES as a hashing algorithm
D. Produces fixed-length digests representing variable-length text

Answer 8

C. AES is not a hashing algorithm.

Question 9

All of the following are valid iterations of the RIPEMD hashing algorithm, except:
A. RIPEMD-384
B. RIPEMD-320
C. RIPEMD-160
D. RIPEMD-256

Answer 9

A. There is no RIPEMD-384 version.

Question 10

Which of the following algorithms produces a 40-character message digest?
A. MD5
B. SHA-1
C. RIPEMD-128
D. Blowfish Answers

Answer 10

B. SHA-1 is a 160-bit hashing algorithm that produces a 40-character hexadecimal message digest, or hash.