Encryption

A word has been encrypted with a Caesar cipher to CBU. The key used was 1. What was the original word?

• abc

• 3

• Bat

• one

When I encrypt a message, I change plain text to

When we convert numbers to binary we use the digits____?

• 0 and 1

• 1, 10, 100, 1000 etc.

• 1, 2, 4, 8, 16

• 5, 10, 15, 20

An encryption key is used to help decrypt messages

• True
• False

What is the algorithm of ceasar's cipher?

• Each letter is replaced with a particular symbol

• Each letter is replaced with a letter a certain number of steps down the alphabet

• Each letter is replaced with a particular number from 0 to 26, and numbers are replaced with letters.

• Each letter is replaced with a completely random number

What type of key is not shared and computers cannot decrypt a message without it?

• Free key
• Private key
• Public key
• Personal key

What would the encryption look like using the key?

• 
• 
• 
• None of them

Alan Turing helped decrypt codes that helped during which era?

• The Plague

• Word War 2

• The 1980s

• The Millennium

Alan Turing helped decrypt coded messages from the Germans. What was the name of the machine he tried to decrypt messages from?

• Enigma

• London Bridge

• ENIAC

• Apple Mac

What is the denary value of this binary representation?

• 26

• 5

• 11

• 101