# Practice Quiz in Cryptography Part 1

(Last Updated On: December 21, 2017) This is the Online Practice Quiz in Cryptography part 1 from the book, Data Communications and Networking 4th Edition by Behrouz A. Forouzan. If you are looking for a reviewer in Electronics Systems and Technologies (Communications Engineering) this will definitely help you test your knowledge and skill before taking the Board Exam.

### Start Part I of the Online Practice Quiz

#### Quiz in Cryptography

Question 1. In an asymmetric-key cipher, the sender uses the__________ key.

A. private

B. public

C. either (a) or (b)

D. neither (a) nor (b)

Question 2. A(n) ______ is a keyless substitution cipher with N inputs and M outputs that uses a formula to define the relationship between the input stream and the output stream.

A. S-box

B. P-box

C. T-box

D. None of these

Question 3. DES uses a key generator to generate sixteen _______ round keys.

A. 32-bit

B. 48-bit

C. 54-bit

D. 42-bit

Question 4. The Caesar cipher is a _______cipher that has a key of 3.

A. transposition

C. shift

D. None of these

Question 5. _________ ciphers can be categorized into two broad categories: monoalphabetic and polyalphabetic.

A. Substitution

B. Transposition

C. either (a) or (b)

D. neither (a) nor (b)

Question 6. The _______ cipher is the simplest monoalphabetic cipher. It uses modular arithmetic with a modulus of 26.

A. transposition

C. shift

D. None of these

Question 7. DES has an initial and final permutation block and _________ rounds.

A. 14

B. 15

C. 16

D. None of these

Question 8. In a(n) ________, the key is called the secret key.

A. symmetric-key

B. asymmetric-key

C. either (a) or (b)

D. neither (a) nor (b)

Question 9. A(n) _______ algorithm transforms plaintext to ciphertext.

A. encryption

B. decryption

C. either (a) or (b)

D. neither (a) nor (b)

Question 10. The DES function has _______ components.

A. 2

B. 3

C. 4

D. 5

### More Practice Quiz in Cryptography

Practice Quiz Part 1

Practice Quiz Part 2

Practice Quiz Part 3

### Complete Practice Quiz in Data Communications and Networking

Note: After taking this particular quiz, you can proceed to check all the topics.

P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.

“Will you subscribe today via YOUTUBE?”

Subscribe