1. How the internet works Cryptography

2. LO: Define the terms encryption and decryption Construct a secure message using encryption LO: Define the terms encryption and decryption Construct a secure message using encryption STARTER Keywords: Cryptography Encrypt Decrypt Hackers Keywords: Cryptography Encrypt Decrypt Hackers Q1: Why is it important to protect personal data? Q2: What does Encryption mean? Q3: What organisation might need to protect personal data they hold? Q4: What is a hacker? Q5: How can hacker access restricted information?

3. Cryptography Can you work out the secret word below? Clue: each number represents a letter 4, 5, 3, 18, 25, 16, 20, D E C R Y P T E D ABCDEFGHIJKLMN 1234567891011121314 OPQRSTUVWXYZ 151617181920212223242526

4. Key terms Encryption (to encrypt) The process of converting data into a form that cannot be easily understood by unauthorised people. Decryption (to decrypt) The process of converting data back into its original form, so it can be understood.

5. Cryptography in the real world Why would a celebrity need to encrypt their personal data? Write the answer in your exercise ensuring you include what encryption and decryption mean. Swap exercise books with your partner, mark their answer. Encryption (to encrypt) The process of converting data into a form that cannot be easily understood by unauthorised people. Decryption (to decrypt) The process of converting data back into its original form, so it can be understood.

6. Encrypting Messages Each letter is represented by a symbol, these are on the cheat sheet provided. LetterABCDEFGHIJ Crypt Code  KLMNOPQRST  UVWXYZ 

7. Decrypt an Encrypted message See if you can work out the secret message example below. Work together if you want to. Task Complete the worksheet provided using the Cheatsheet. There are extension tasks available on the sheet.    WORK HARD

8. Homework See if you can come up with you own version of a cipher. Use the wheel template and change it how ever you want. What will you change? What other symbols could you use? Ensure that you include a full description about how the decode a message with an example. Due: next lesson