# Secure IoT access at scale using blockchains and smart contracts

## TL;DR

This paper presents a scalable IoT access control system leveraging Ethereum blockchain and smart contracts, enhancing security, flexibility, and resilience in large-scale IoT deployments.

## Contribution

It introduces a blockchain-based IoT architecture with a token-based access control mechanism, considering IoT device limitations and Ethereum's capabilities.

## Key findings

- The system provides improved security and usability.
- It demonstrates viability through evaluation.
- Offers a resilient, flexible IoT control solution.

## Abstract

Blockchains and smart contracts are an emerging, promising technology, that has received considerable attention. We use the blockchain technology, and in particular Ethereum, to implement a large-scale event-based Internet of Things (IoT) control system. We argue that the distributed nature of the "ledger," as well as, Ethereum's capability of parallel execution of replicated "smart contracts", provide the sought after automation, generality, flexibility, resilience, and high availability. We design a realistic blockchain-based IoT architecture, using existing technologies while by taking into consideration the characteristics and limitations of IoT devices and applications. Furthermore, we leverage blockchain's immutability and Ethereum's support for custom tokens to build a robust and efficient token-based access control mechanism. Our evaluation shows that our solution is viable and offers significant security and usability advantages.