unchained-cli-eth

A command line implementation of unchained-identities in Python for the Ethereum Network.

Purpose

This is a Python implementation of the paper "Unchained Identities: Putting a Price on Sybil Nodes in Mobile Ad hoc Networks".

http://filepool.informatik.uni-goettingen.de/publication/tmg/2018/bo_le_ho_unchained_securecomm2018.pdf

Usage

This whole project needs python3

$ unchained create <private_key> <tx_hash> <rpc_endpoint> <path/for/proof>
 $ unchained verify <path/to/proof.xml>
 $ unchained deploy <path/to/proof.xml> <path/to/raspberry/dist/path/to/destination>
 $ unchained -h | --help
 $ unchained --version

Example

On the ropsten testnetwork there is a transaction (hash: 0x8ec420a3ba331f2a967ecdaf69b78bbb604ebbb2554a8c635142b7b306defaae) of 1 eth that is accepted as valid transaction. This can be taken to verify that everything is working.

$ pip install .
 $ unchained create 785cdcd731a1b2438ec4511a25d04efbdc499ed350df612364af1aa6f4fd6abd 0x8ec420a3ba331f2a967ecdaf69b78bbb604ebbb2554a8c635142b7b306defaae https://ropsten.infura.io/ffn6QLIJrYtke3b07YLp ./example_proof/
 $ unchained verify ./example_proof/unchained-proof.xml

output:

{'nodeid': 'RwqsYOJSFdAUTAQxvaag2w55T0GvTzBqpS6l41EfFwI=', 'publickey': '4bd485055bf829d8b8fd817ac6b4a0213f76b80c757cb33bd2f52ee6dc18240ac5ba4fb646d50eeac0eb6f9b01a22d3a9245b543105d47304869b14673bbbab5'} True

Dependencies

• web3
• ethereum
• trie
• docopt
• lxml

Installation

If you've cloned this project, and want to install the library (and all development dependencies), the command you'll want to run is

$ cd unchained-cli-eth
 $ pip install .

if this installation failes, you need to install python3-dev and libssl-dev, because cytoolz and scrypt need them:

$ sudo apt-get install python3-dev
 $ sudo apt-get install libssl-dev

then try again

You should consider using a clean python3 environment, this can be done with virtualenv: https://virtualenv.pypa.io/en/stable/

Installation on a raspberry pi

After You installed this tool, you can use it to install unchained-identities on a raspberry pi It is recommended to use virtualenv.

• Flash a sd-card with raspbian (strech-lite is recommended)
• change the rights, so You can write on the sdcard:

$ sudo chmod -R a+rwx /meidia/<user>/rootfs/home/pi/<some sub folder>

• • be sure to not run chmod -R on /media/<user>>/rootfs/ because it will mess up the raspberry os
• Run unchained deploy

$ unchained deploy <path/to/unchained-identities/repo/folder> <path/to/proof-and-id/folder> <path/to/raspberry/dist/path/to/destination/folder>

• boot up the raspberry

Under /<destination-folder>/unchained-eth you can find

• 'verify.py' - the skript that verifies proofs
• 'unchained-proof.xml' - the proof for this node
• 'unchained-id.xml' - the id for this node (contains private key, be carefull)
• 'requirements.txt' - requirements for pip

• install python3 on the raspberry
• run

$ pip install -r /path/to/requirements.txt

• now You can try to verify Your own proof with

$ python3 verify.py unchained-proof.xml

• output should be True
• Done
• if You get the error, that the import "from lxml import etree" is not working try installing lxml with

$ apt-get install python3-lxml

Configuration

under <repo>/unchained/commands/mylib/ is a file called const.py

There are some options to custamize how this tool behaves, they are explained there.

Notes

There is also a version of this Project for bitcoin: https://github.com/SchulerSimon/unchained-cli-btc

please note that due to naming reasons it is not possible to install and run both versions in the same python3 environment on a PC (use virtualenv: https://virtualenv.pypa.io/en/stable/). Both versions can run alongside eachother on a pi.

this was implemented by Simon Schuler ([email protected])

Performance Measures

Bitcoin:

• Proof size (depending on blocksize):
• • ~10kb-50kb
• Verify proof time on a raspberry pi 3:
• • ~2 sec
• Create proof time on desktop intel i7 quadcore
• • ~1 sec

Ethereum:

• Proof size (depending on blocksize):
• • ~50kb-150kb
• Verify proof time on a raspberry pi 3:
• • ~60 sec (!!)
• Create proof time on desktop intel i7 quadcore
• • ~10 sec (dependent on the speed of the provided rpc)

All in all we can say that the Bitcoin-Network has superior performance properties for IOT-devices. This is due to the deliberate design of the Ethereum hash function ethash. See: https://github.com/ethereum/wiki/wiki/Ethash-Design-Rationale