Due Date: Friday October 21, 2022
Lesson 13
Overview
In this lesson, students use the Bluetooth radio capability
to transmit encoded messages.
• Program the microbit using its Bluetooth radio capability
• Send and receive data between two see if other can decode it.
Resources
• micro:bit and micro-USB cord
• Computer with access to the internet
Steps
• Mr. Cusack will give you a message to send to your teammate.
• Mr. Cusack will give you a message to your teammate to send to you.
• You will need to use Caeser Cypher to encode the message.
• The other teams will listen and see if they can determine what the message is.
Get some notebook paper and put your heading on it.
Part 1
Example of a message I got:
Joe - The meaning of life is to give life meaning
Create a Caeser Cipher for this:
Click here to find out how to do a Caeser Cipher.
Part 2 (Practice on the Board)
We will practice the Caeser Cipher again.
Click here to decrypted this message.
Tools to help you break a Ceaser Cipher. Letter occurance in text. Click here.
Part 3 (Write a program as a group)
Ideas to break the Caeser Cipher.
(All Students will work on this together)
(You may want to use Python)
Iterate through the offset options until the data makes sense (using a simple Python program). There are normally only 26 options.
Any letter will have the same encrypted value no matter where it is in the text. So simply use probability. For example: e is the most common letter in English, so find the most common encrypted letter and that’s probably e. Then you can find the offset and decrypt the entire message.
Predict original content based on the spacing and length of the words. If you find even one letter then you can get the offset and decrypt the entire message.
We use the repl.it online Python IDE (Integrated Development Environment) for
more complex and longer python program problems.
The link to the repl.it online Python IDE (Integrated Development Environment) is on the next line.
Click here to use the online python compiler and IDE.
