CRYPTOGRAPHY...define a consistent ‘cipher’. A ‘cipher’ determines how the message is encrypted. One of the earliest known ciphers is the Caesar cipher, which Julius Caesar

CRYPTOGRAPHYAN INTRODUCTION…

WHAT IS CRYPTOGRAPHY?Cryptography is the study of the

encryption and decryption of messages.

Encoding a message is a security measure to ensure that only the intended receiver

understands the message.

KEY VOCABULARYCryptography - the study of encryption and decryption of

messages.

Encrypting - obfuscating a message

Decrypting - figuring out the original message from the encrypted message

Cipher - the system or procedure used to encrypt and decrypt messages.

CIPHERSWhen encoding a message, it is important to

define a consistent ‘cipher’. A ‘cipher’ determines how the message is

encrypted.

One of the earliest known ciphers is the Caesar cipher, which Julius Caesar used to send

encoded and secure messages to generals in the Roman army.

WHY DO WE USE ENCRYPTION?

Cryptography is used a lot in computer science. Internet traffic is often encrypted at some point and relies on consistent cipher generation and

transmission in order for secure messages to be sent.

THE CAESAR CIPHER

THE SPHERO CIPHER

THE SPHERO CIPHER

The Sphero Cipher uses a pyramid formation of letters and numbers. You need to use accurate

code to navigate your Sphero around the letters to identify the letters to spell out the secret code.

THE SPHERO CIPHERTo encrypyt your message: Keep your word a

secret from others. Starting from the start position, use block coding to navigate your

Sphero to the correct letters to spell out your message. You will need to be super accurate

with your code to ensure that the Sphero clearly lands on specific letters. This may take a lot of

trial and error and debugging!

THE SPHERO CIPHER

THE SPHERO CIPHER

To decrypt your message: To decrypt a message: swap code with a partner. (you will need to make

sure you use their Sphero Cipher Pyramid to ensure accuracy). Look at the code and see if

you can predict what their message is.

THE SPHERO CIPHERIt is important to start off simple and build up the difficulty as

you go. Here is the Sphero Cipher in action decoding a simple 3 letter word.