Year 8 Keep it safe 2

Why do we need cryptography in computing?

• to keep confidential information secure
• to help make more money
• to stop spam emails
• to speed up computers

Where does the word 'Cryptography' come from?

• secret writing
• Roman writing
• difficult messages
• writing problem

What is a cypher?

• a coded message
• a way of putting a message into code
• a decoded message
• a way of decoding a message

What is plaintext?

• a coded message
• a way of putting a message into code
• a  message which is in plain English
• a way of decoding a message

What is the opposite of plaintext?

• cyphertext
• prettytext
• plainpics
• encryption

What type of encryption is a Caesar cypher?

• substitution cypher
• roller cypher
• complex cypher
• uncrackable code

If you were to encrypt the word hello using a Caesar cypher with a key of 2, which would it be?

• jgnnq
• abcde
• abrro
• fbaae

What word encrypted using a Caesar Cypher and the key 3 would be: wrgdb

• maker
• lesson
• coded
• today

If you encrypted the word lesson using a Caesar cypher with a key of 1 which would it be?

• mgvvqr
• mfttpo
• kdttph
• kjdfkj

What was the name of the German code machine in the second world war?

• Anger
• Puzzle
• Enigma
• Encoder