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# Practice Quiz in Cryptography Part 1

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.

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