Unit 4 exam

Last Name

First Name

Date

Period

• 1
• 2
• 3
• 4
• 5

1. What are the two forms of Authenticated modes of operations?

• Single-sided and double-sided
• Disconnected and mutual
• Single-sided and mutual
• Dual and unilateral

2. Authenticated modes of encryption validate the integrity of the ciphertext, verifying it has not been modified.

• True
• False

3. What is a mode of operation?

• The choice on boot between running in BIOS or loading the OS
• Choosing whether to work with traditional medicine or black magic
• Determining whether the game difficulty is easy, medium, hard, or impossible
• An algorithm used with a block cipher to make an encryption algorithm

4. Which of the following is true about CTR mode?

• It authenticates and encrypts at the same time
• It is a block cipher acting like a stream cipher
• It is a stream cipher acting like a block cipher
• The counter decreases by one from one block to the next

5. What is a blockchain?

• A chain of block ciphers
• a distributed and immutable public ledger
• A series of encryption algorithms designed to secure governmental data
• None of the above

6. What is a stream cipher?

• A symmetric key cipher that encrypts plaintext one byte at a time
• An asymmetric key cipher that encrypts plaintext one stream at a time
• A symmetric key cipher that encrypts plaintext one block at a time
• An asymmetric key cipher that encrypts plaintext one hash at a time