CryptoLock

Gatekeeping using Raspberry Pi, LED Lights, RFID Reader and Ethereum. Check the report document for a more in-depth description and outcomes.

Video Overview

Installation Guide

Preamble: IoT-Blink using Ethereum Network

Install and Setup Geth

Copy the URL for the latest build from here for ARMv7.

wget https://gethstore.blob.core.windows.net/builds/geth-linux-arm7-1.8.3-329ac18e.tar.gz
tar -xvf geth-linux-arm7-1.8.3-329ac18e.tar.gz
cd geth-linux-arm7-1.8.3-329ac18e
sudo mv geth /usr/local/bin/
cd ~
geth version

Once you have installed Geth, you can start syncing the blockchain.

geth --rinkeby --syncmode=light --cache=96 console
> eth.syncing // Use to track progress of sync
> personal.newAccount() // Use to create account for identification in the Ethereum Network

Note: The installation of the Blockchain will take around 5 hours. We recommend going to Step 7 during this time and installing Ethereum Wallet.

Note: At this time the latest build is for v1.8.3.

Install Node and NPM

sudo wget -O - https://raw.githubusercontent.com/audstanley/NodeJs-Raspberry-Pi/master/Install-Node.sh | sudo bash node -v

Clone this Repository and Install Dependencies

git clone https://github.com/BUConnectedWorld/Group3.git
cd Group3/node
npm install

Set Up Raspberry Pi
- You will need to have 2 LEDs, an RFID Reader and a Stepper Motor connected to the Raspberry Pi.
- ELECTOHOUSE WIRELESS-NFC-PN532
- HYBRID STEPPING MOTOR 42BYGHM809
Host Ethereum Node

Assuming Geth has finished syncing, open a new terminal and start Geth in RPC mode.
```
geth --rinkeby --syncmode=light --cache=96 --rpc --rpciapi="db,eth,net,web3,personal" console
```
- This should output somewhere the port where the node will be run. Usually Port 8545.

Host Contract on Ethereum Network

For this we will use the Ethereum Wallet. When you setup the Wallet make sure you download the same Network that you downloaded for the Raspberry Pi. In our case we used the Rinkeby Test Network.
Once finished setting up the Wallet, head to the Contract tab and create your contract or, if you would prefer, you can load our Contract using this address for the Rinkeby Network 0x630583cc80Dd3FddcCfBa12aB62abA4294De8393 and this ABI String:

[ { "constant": false, "inputs": [ { "name": "_cardData", "type": "string" }, { "name": "_newData", "type": "string" } ], "name": "check", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "getValidData", "outputs": [ { "name": "", "type": "string", "value": "helo" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "inputs": [], "payable": false, "stateMutability": "nonpayable", "type": "constructor" } ]

Run gatekeep.js on the Raspberry Pi
- Open a new terminal while hosting an Ethereum Node (see step 6).
```
cd Group3/node/
node gatekeep.js
```
- If no errors occurr, the program should output some information and then wait for the Gatekeeper contract to be accessed from the Ethereum Wallet using the button.
Access the Contract
- Tap an NTAG sticker on the RFID reader to initiate a transaction with the Ethereum Network.
- This will run the Gatekeeper contract check function which will take the data stored on the card and verify if it belongs to a valid Account. If it is, the data stored on the blockchain will change, and so will the data on the NTAG.
- If the console outputs UNDEFINED the data on the NTAG is corrupted or the read format is not supported.
- If the console outputs INVALID the data on the NTAG did not contain the valid data stored on the Ethereum Network.
- Else, the console will output an OPEN DOOR message followed by a CLOSE DOOR message.
- In between the open and close message you should receive an acknowledgment that the new data has been written to the NTAG.
- You can debug the NTAG data using node misc/write_data.js which will write the valid data to access the Ethereum Network and node misc/read_data.js to read data from the NTAG.

eportet/CryptoLock

CryptoLock

Video Overview

Installation Guide