C839 - INTRODUCTION TO CRYPTOGRAPHY (E/CES STUDY
MATERIAL) QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW
How did the ATBASH cipher work?
a. By shifting each letter a certain number of spaces
b. By Multi alphabet substitution
c. By rotating text a given number of spaces
d. By substituting each letter for the letter from the opposite end of the
alphabet (i.e. A
becomes Z, B becomes Y, etc.) Ans✓✓✓ D - By substituting each letter
for the letter from the opposite end of the alphabet (i.e. A becomes Z, B
becomes Y, etc.)
DES has a key space of what?
a. 2^128
b. 2^192
c. 2^56
d. 2^64 Ans✓✓✓ C - 2^56
3. Which of the following are valid key sizes for AES (choose three)?
a. 56
,b. 64
c. 128
d. 192
e. 256
f. 512 Ans✓✓✓ C - 128
D - 192
E - 256
4. Which of the following algorithms uses three different keys to encrypt
the plain text?
a. AES
b. 3DES
c. Blowfish
d. Skipjack Ans✓✓✓ B - 3DES
5. Which of the following is a block cipher?
a. AES
b. RC4
c. DH
d. RSA Ans✓✓✓ A - AES
, 6. Which of the following is a type of encryption that has two different
keys. One key can encrypt
the message and the other key can only decrypt it?
a. Symmetric
b. Asymmetric
c. Block cipher
d. Stream cipher Ans✓✓✓ B - Asymmetric
7. Which of the following is an asymmetric cipher?
a. DES
b. RC4
c. RSA
d. AES Ans✓✓✓ C - RSA
8. A cipher is defined as what
a. Any algorithm used in cryptography
b. The key used to encrypt a message
c. The algorithm(s) needed to encrypt and decrypt a message
d. Encrypted text Ans✓✓✓ C - The algorithm(s) needed to encrypt and
decrypt a message
MATERIAL) QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW
How did the ATBASH cipher work?
a. By shifting each letter a certain number of spaces
b. By Multi alphabet substitution
c. By rotating text a given number of spaces
d. By substituting each letter for the letter from the opposite end of the
alphabet (i.e. A
becomes Z, B becomes Y, etc.) Ans✓✓✓ D - By substituting each letter
for the letter from the opposite end of the alphabet (i.e. A becomes Z, B
becomes Y, etc.)
DES has a key space of what?
a. 2^128
b. 2^192
c. 2^56
d. 2^64 Ans✓✓✓ C - 2^56
3. Which of the following are valid key sizes for AES (choose three)?
a. 56
,b. 64
c. 128
d. 192
e. 256
f. 512 Ans✓✓✓ C - 128
D - 192
E - 256
4. Which of the following algorithms uses three different keys to encrypt
the plain text?
a. AES
b. 3DES
c. Blowfish
d. Skipjack Ans✓✓✓ B - 3DES
5. Which of the following is a block cipher?
a. AES
b. RC4
c. DH
d. RSA Ans✓✓✓ A - AES
, 6. Which of the following is a type of encryption that has two different
keys. One key can encrypt
the message and the other key can only decrypt it?
a. Symmetric
b. Asymmetric
c. Block cipher
d. Stream cipher Ans✓✓✓ B - Asymmetric
7. Which of the following is an asymmetric cipher?
a. DES
b. RC4
c. RSA
d. AES Ans✓✓✓ C - RSA
8. A cipher is defined as what
a. Any algorithm used in cryptography
b. The key used to encrypt a message
c. The algorithm(s) needed to encrypt and decrypt a message
d. Encrypted text Ans✓✓✓ C - The algorithm(s) needed to encrypt and
decrypt a message
