Radio Frequency Encrypted Communications

Problem Statement:

Wirelessly transmit a secure text-based message that only the target receiver can read in plain text.

Functional Requirements:

• Message input by the user using a PC and keyboard connected to the transmitter circuit
• The transmitter must encrypt the message to prevent interceptors from reading the message contents without permission
• Data encoded and transmitted over 433MHz radio frequency
• Message recipient inputs decryption passkey into receiver circuit via physical numpad
• The receiver circuit must decode the data bundle and use the inputted passkey to decrypt the message back into plain text
• The receiver circuit must display the received text data on an LCD screen.

Hardware Components:

• 2x Arduino Nano microcontrollers
• 1x 433 MHz Radio Frequency Receiver Module - https://surplustronics.co.nz/products/11377-ask-transmitter-and-receiver-kit
• 1x 20x4 LCD with I2C communication capabilities - https://surplustronics.co.nz/products/10071-lcd-display-lcd1602-module-blue-screen
• 1x 4x3 Keypad - https://surplustronics.co.nz/products/6183-keypad-switch-16-key
• 1x Breadboard - https://www.jaycar.com.au/arduino-compatible-breadboard-with-400-tie-points/p/PB8820
• Jumper Wires - https://www.jaycar.com.au/150mm-plug-to-plug-jumper-leads-40-piece/p/WC6024

Software Packages:

• Arduino IDE - https://www.arduino.cc/en/software/
• Processing Development Environment - https://processing.org/download
• RadioHead Library - https://www.airspayce.com/mikem/arduino/RadioHead/
• AESLib Library - https://github.com/suculent/thinx-aes-lib