# Practice Quiz in Cryptography Part 3

Online Practice Quiz in Cryptography part 3 from the book Data Communications and Networking 4th Edition by Behrouz A. Forouzan.

This is the Online Practice Quiz in Cryptography part 3 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.

### Continue Part III of the Online Practice Quiz

#### Quiz in Cryptography

Question 21. The ________ is the message after transformation.

A. ciphertext

B. plaintext

C. secret-text

D. None of these

Question 22. The _________ attack can endanger the security of the Diffie-Hellman method if two parties are not authenticated to each other.

A. man-in-the-middle

B. ciphertext attack

C. plaintext attack

D. None of these

Question 23. The ________is the original message before transformation.

A. ciphertext

B. plaintext

C. secret-text

D. None of these

Question 24. ECB and CBC are ________ ciphers.

A. block

B. stream

C. field

D. None of these

Question 25. A(n) ______ algorithm transforms ciphertext to plaintext.

A. encryption

B. decryption

C. either (a) or (b)

D. neither (a) nor (b)

Question 26. In a(n) ________ cipher, a pair of keys is used.

A. symmetric-key

B. asymmetric-key

C. either (a) or (b)

D. neither (a) nor (b)

Question 27. The _______ is a number or a set of numbers on which the cipher operates.

A. cipher

B. secret

C. key

D. None of these

Question 28. DES is a(n) ________ method adopted by the U.S. government.

A. symmetric-key

B. asymmetric-key

C. either (a) or (b)

D. neither (a) nor (b)

Question 29. A modern cipher is usually a complex _____cipher made of a combination of different simple ciphers.

A. round

B. circle

C. square

D. None of these

Question 30. AES has _____ different configurations.

A. two

B. three

C. four

D. five

Question 31. ________ DES was designed to increase the size of the DES key.

A. Double

B. Triple

D. None of these

### 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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