Introduction to Cryptography - C839 - ECES EC-Council
Certified Encryption Specialist Practice Exam Latest 2022
with complete solution
1. How did the ATBASH cipher work?
By substituting each letter for the letter from the opposite end of the alphabet (i.e.
Abecomes Z, B becomes Y, etc.)
2. DES has a key space of what?
2^56
3. Which of the following are valid key sizes for AES (choose three)?
c. 128
d. 192
e. 256
4. Which of the following algorithms uses three different keys to encrypt the plain
text?
3DES
Triple Data Encryption System
5. Which of the following is a block cipher?
AES
The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm
and U.S. government standard for secure and classified data encryption and decryption.
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?
Asymmetric
7. Which of the following is an asymmetric cipher?
RSA
The acronym stands for Rivest, Shamir, and Adelman, the inventors of the technique.
The RSA algorithm is based on the fact that there is no efficient way to factor very
large numbers.
8. A cipher is defined as what
The algorithm(s) needed to encrypt and decrypt a message
9. Which of the following is not an asymmetric system?
AES
The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm
and U.S. government standard for secure and classified data encryption and decryption.
10. John is going to use RSA to encrypt a message to Joan. What key should he
use?
Joan's public key
11. What advantage do symmetric algorithms have over asymmetric algorithms
Symmetric algorithms are faster than Asymmetric algorithms
, 12. Which of the following is generally true about key sizes?
Larger key sizes increase security
13. A ____ is a function is not reversible.
Hash
14. Which of the following is a protocol for exchanging keys?
DH
Diffie-Hellman is a way of generating a shared secret between two people in such a
way that the secret can't be seen by observing the communication. That's an important
distinction: You're not sharing information during the key exchange, you're creating a
key together.
15. Which of the following would be the fastest process?
AES
The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm
and U.S. government standard for secure and classified data encryption and decryption.
16. Which of the following would be the weakest encryption algorithm?
DES
Data Encryption Standard
17. What is the largest key size that AES can use?
256
18. What are a few different key exchange protocols?
MED
DH - Diffie-Hellman
MQV - Menezes-Qu-Vanstone is an authenticated protocol for key agreement based
on the Diffie-Hellman scheme
ECDH - ECDH is a variant of the Diffie-Hellman algorithm for elliptic curves
AES is not a key exchange protocol; it is a Symmetric Block Cipher
19. Which of the following is a key exchange protocol?
MQV
MQV (Menezes-Qu-Vanstone) is an authenticated protocol for key agreement based on
the Diffie-Hellman scheme. Like other authenticated Diffie-Hellman schemes, MQV
provides protection against an active attacker.
20. Which of the following encryption algorithms relies on the inability to factor
large prime numbers?
RSA
The acronym stands for Rivest, Shamir, and Adelman, the inventors of the technique.
The RSA algorithm is based on the fact that there is no efficient way to factor very
large numbers.
21. Using substitution without transposition leads to what weakness?
Letter/word frequency is maintained
Certified Encryption Specialist Practice Exam Latest 2022
with complete solution
1. How did the ATBASH cipher work?
By substituting each letter for the letter from the opposite end of the alphabet (i.e.
Abecomes Z, B becomes Y, etc.)
2. DES has a key space of what?
2^56
3. Which of the following are valid key sizes for AES (choose three)?
c. 128
d. 192
e. 256
4. Which of the following algorithms uses three different keys to encrypt the plain
text?
3DES
Triple Data Encryption System
5. Which of the following is a block cipher?
AES
The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm
and U.S. government standard for secure and classified data encryption and decryption.
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?
Asymmetric
7. Which of the following is an asymmetric cipher?
RSA
The acronym stands for Rivest, Shamir, and Adelman, the inventors of the technique.
The RSA algorithm is based on the fact that there is no efficient way to factor very
large numbers.
8. A cipher is defined as what
The algorithm(s) needed to encrypt and decrypt a message
9. Which of the following is not an asymmetric system?
AES
The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm
and U.S. government standard for secure and classified data encryption and decryption.
10. John is going to use RSA to encrypt a message to Joan. What key should he
use?
Joan's public key
11. What advantage do symmetric algorithms have over asymmetric algorithms
Symmetric algorithms are faster than Asymmetric algorithms
, 12. Which of the following is generally true about key sizes?
Larger key sizes increase security
13. A ____ is a function is not reversible.
Hash
14. Which of the following is a protocol for exchanging keys?
DH
Diffie-Hellman is a way of generating a shared secret between two people in such a
way that the secret can't be seen by observing the communication. That's an important
distinction: You're not sharing information during the key exchange, you're creating a
key together.
15. Which of the following would be the fastest process?
AES
The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm
and U.S. government standard for secure and classified data encryption and decryption.
16. Which of the following would be the weakest encryption algorithm?
DES
Data Encryption Standard
17. What is the largest key size that AES can use?
256
18. What are a few different key exchange protocols?
MED
DH - Diffie-Hellman
MQV - Menezes-Qu-Vanstone is an authenticated protocol for key agreement based
on the Diffie-Hellman scheme
ECDH - ECDH is a variant of the Diffie-Hellman algorithm for elliptic curves
AES is not a key exchange protocol; it is a Symmetric Block Cipher
19. Which of the following is a key exchange protocol?
MQV
MQV (Menezes-Qu-Vanstone) is an authenticated protocol for key agreement based on
the Diffie-Hellman scheme. Like other authenticated Diffie-Hellman schemes, MQV
provides protection against an active attacker.
20. Which of the following encryption algorithms relies on the inability to factor
large prime numbers?
RSA
The acronym stands for Rivest, Shamir, and Adelman, the inventors of the technique.
The RSA algorithm is based on the fact that there is no efficient way to factor very
large numbers.
21. Using substitution without transposition leads to what weakness?
Letter/word frequency is maintained
