Cryptography KS3

Before computers why were messages usually encrypted?

• They weren't encrypted before computers
• So in war Commanders/leaders could communicate safely with their troops
• To share messages with people who were clever enough to solve them
• All of these reason

Who was the first know user of the Caesar Code?

• Caesar Romanus
• Julius Caesar
• Alan Turing
• There isn't one

When put a message into code what do we call it?

• Encipher
• Decipher
• Mix up
• Distribute

When we solve a code what is the process called?

• Encipher
• Decipher
• Mix Down
• Distribute

When solving a code, we need a letter or a word to help us get started, what is this often referred to as?

• Help
• Support
• Key
• Answer

What machine was used during WWII to encrypt and decrypt German messages?

• Enigma
• Atbash
• Secret
• Puzzler

How many different ways of setting up the machine was there said to be?

• 1000

• 1 Trillion

• 186 million million million

• 1 Million

An encryption key is used to help decrypt messages

• True
• False

What was the name of the man who led the team that cracked the German's "Enigma Code" in WW2?

• Tim Berners-Lee

• Alan Turing

• Stephen Hawking

• Bill Gates

Which of the following statements is INCORRECT?

• Original methods of encryption (such as the Caesar Cipher) do not need the use of a key

• Data can be encrypted using ciphers and decrypted using a key

• Users cannot read or understand encrypted data without the use of a key

• The Caesar Cipher is an example of a substitution cipher