MechaCrypt: Hardware-Encrypted Messaging System

This repository contains the source code and documentation for MechaCrypt, with both FPGA (UPduino v3.1 ) and MCU (Nucleo-L432KC).

Project Report Website: https://rex-josaphat.github.io/MechaCrypt-Portfolio/pages/

Repository Structure

• sender/: Contains the FPGA and MCU code for the sender side of the MechaCrypt system.

  • fpga/: Contains SystemVerilog code and testench implementing AES encryption, SPRAM read/write and bit-banged byte sending over mechanical actuators.
  • mcu/: Contains C code implementing Web server for message input and parsing in ASCII, TRNG for encryption key generation, SPI communication with FPGA to send keys, plaintext and cyphertext.

• receiver/: Contains the FPGA and MCU code for the receiver side of the MechaCrypt system.

  • fpga/: Contains SystemVerilog code and testbench implementing AES decryption and bridge code to .
  • mcu/: Contains C code for reconstructing full messages from mechanical actuator inputs, displaying progress on a 16×4 LCD, parsing received plaintext, and displaying on web server.

Tech Stack

Domain	Tools / Technologies
Hardware	Lattice UP5K FPGA, STM32L432KC MCU, ESP8266
Languages	SystemVerilog, Embedded C, HTML, CSS
Protocols	I2C, SPI, USART, HTTP
UI	Web dashboard/server + 20×4 LCD

Authors

• Josaphat Ngoga

  • Github: https://github.com/Rex-Josaphat
  • Website: https://jngoga.vercel.app/
  • E155 Portfolio: https://rex-josaphat.github.io/E155-Portfolio/

• Christian Wu

  • Github: https://github.com/chrwu17
  • E155 Portfolio: https://chrwu17.github.io/hmc-e155-portfolio/