Secure IoT Framework with Blockchain

Overview

The Secure IoT Framework with Blockchain project demonstrates the use of Ethereum smart contracts to improve IoT security through decentralized device authentication, authorization, communication control, data integrity verification, and immutable audit logging.

Developed using Solidity, Remix IDE, and Ganache, the framework establishes trust among IoT devices without relying on a centralized authority. By leveraging blockchain technology, the solution addresses common IoT security challenges such as unauthorized device access, data tampering, and lack of auditability.

Problem Statement

Traditional IoT systems often depend on centralized architectures for authentication, authorization, and data management. These approaches introduce several security challenges:

Single points of failure
Unauthorized device access
Data integrity issues
Limited auditability
Trust management challenges
Increased attack surface in centralized environments

Blockchain technology provides a decentralized and tamper-resistant approach to addressing these security concerns.

Objectives

Implement blockchain-based device authentication and authorization.
Verify IoT data integrity using cryptographic hashing.
Control communication between authorized devices.
Maintain immutable audit logs of device activities.
Demonstrate secure IoT interactions using Ethereum smart contracts.

Technologies Used

Category	Technology
Blockchain Platform	Ethereum
Smart Contract Language	Solidity
Development Environment	Remix IDE
Blockchain Simulator	Ganache
Cryptographic Hashing	Keccak-256
Version Control	Git & GitHub

Setup & How to Run

Prerequisites

Ganache — local Ethereum blockchain simulator
Remix IDE — no installation needed, runs in browser

Steps

1. Start Ganache

Open Ganache → click Quickstart Ethereum
Note the RPC Server: HTTP://127.0.0.1:7545
You will see 10 pre-funded test accounts ready to use

2. Open Remix IDE

Visit https://remix.ethereum.org in your browser
In the File Explorer → click Upload
Upload contracts/IoTSecurityContract.sol from this repo

3. Compile the Contract

Go to Solidity Compiler tab (left sidebar)
Select the compiler version matching the pragma line in the contract
Click Compile IoTSecurityContract.sol
Green tick = compiled successfully

4. Deploy to Ganache

Go to Deploy & Run Transactions tab
Change Environment to Web3 Provider
Enter Ganache RPC URL: http://127.0.0.1:7545
Select a test account from the dropdown
Click Deploy

5. Test the Contract Functions

Expand the deployed contract panel in Remix
Test each function:
- authorizeDevice() — register a trusted IoT device
- revokeDevice() — remove device authorization
- verifyDataIntegrity() — check hash of device data
- allowCommunication() — set device communication permissions
- logActivity() — record device action on blockchain
Check Ganache → Transactions tab to see each call recorded

Repository Structure

secure-iot-framework-blockchain/
│
├── README.md
├── LICENSE
│
├── contracts/
│   └── IoTSecurityContract.sol
│
├── docs/
│   ├── Secure_IoT_Framework_Report.pdf
│   └── Research_Paper.pdf
│
├── architecture/
│   ├── admin_panel_interaction.png
│   └── iot_device_interaction.png
│
├── screenshots/
│   ├── remix_deployment.png
│   ├── device_authorization.png
│   └── ganache_transactions.png
│
└── results/
    └── transaction_logs.md

Architecture Diagrams

Admin Panel Interaction

This workflow illustrates how an administrator manages IoT devices through the smart contract by authorizing devices, controlling communication permissions, and recording device activities on the blockchain.

IoT Device Interaction

This workflow demonstrates how IoT devices interact with the blockchain framework to request authorization, verify data integrity, and communicate securely with authorized devices.

Project Demonstration

Smart Contract Deployment

The smart contract was developed, compiled, and deployed using Remix IDE. The deployment interface provides access to implemented security functions, including authorization, communication control, data integrity verification, and audit logging.

Device Authorization

This screenshot shows successful execution of the authorizeDevice() function, demonstrating blockchain-based device authorization and access control.

Ganache Transaction Validation

Ganache was used as a local Ethereum blockchain environment to validate smart contract deployment and transaction execution. The transaction history confirms successful blockchain interactions during testing.

Key Features

Device Authentication and Authorization

Register and manage trusted IoT devices.
Restrict network participation to authorized devices.
Support device authorization and deauthorization.

Data Integrity Verification

Store cryptographic hashes using Keccak-256.
Verify authenticity of device-generated data.
Detect unauthorized modifications.

Communication Permission Control

Define communication permissions between devices.
Prevent unauthorized device interactions.
Enforce trust relationships using smart contracts.

Immutable Audit Logging

Record device activities as blockchain events.
Provide tamper-resistant audit records.
Improve accountability and traceability.

Security Controls Implemented

Security Control	Implementation
Authentication	Blockchain-based device identity verification
Authorization	Owner-controlled device access management
Integrity Protection	Keccak-256 hash verification
Communication Security	Permission-based communication control
Auditability	Immutable blockchain event logging
Decentralized Trust	Removal of centralized trust dependency

MITRE ATT&CK Mapping

Although this project focuses on preventive controls rather than active threat detection, the implemented security mechanisms help mitigate techniques associated with unauthorized access and data manipulation.

MITRE ATT&CK Technique	Description
T1078	Valid Accounts
T1098	Account Manipulation
T1557	Adversary-in-the-Middle
T1565	Data Manipulation
T1485	Data Destruction

Results

The framework successfully demonstrated:

Blockchain-based device authorization
Secure communication control
Data integrity verification
Smart contract deployment and execution
Blockchain transaction validation using Ganache
Immutable event-based activity logging

The project validated the feasibility of integrating blockchain technology into IoT environments to improve trust, transparency, and security.

Skills Demonstrated

Blockchain Security
Smart Contract Development
Solidity Programming
Ethereum Development
Access Control Implementation
Data Integrity Verification
Cryptographic Hashing
Security Architecture Design
Audit Logging
Secure Communication Controls
Blockchain Testing and Validation

Project Outcomes

Through the successful implementation and testing of this framework, the following objectives were achieved:

Secure device authorization using Ethereum smart contracts.
Blockchain-based integrity verification using cryptographic hashing.
Controlled communication between authorized IoT devices.
Immutable audit logging through blockchain events.
Smart contract deployment and validation using Remix IDE.
Blockchain transaction verification using Ganache.
Demonstration of decentralized trust management for IoT environments.
Practical implementation of blockchain security concepts within an IoT use case.

Author

Muhammed Wasim P M

B.Tech Computer Science Engineering (Cybersecurity)
Associate of ISC2 (CISSP Passed)
Cybersecurity Graduate
Focus Areas: SOC Operations, Threat Detection, Incident Response, SIEM, SOAR, and Security Engineering

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Secure IoT Framework with Blockchain

Overview

Problem Statement

Objectives

Technologies Used