Decentralized Cloud Storage System Using Blockchain

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Project Overview

• This project aims to build a Decentralized Cloud Storage System using blockchain technology. The system enables users to securely store, share, and access files without depending on a central authority. The system ensures data privacy, integrity, and availability by distributing files across multiple nodes using IPFS. Additionally, a master location is used to store files, guaranteeing 24/7 availability, even if the decentralized nodes go offline.

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To watch the demo video of our project Click Here

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Key Features:

• Decentralized File Storage: Files are fragmented and stored across multiple nodes using IPFS to avoid central control.
• Master Location Backup: Ensures 24/7 availability of files, even if files on IPFS nodes are unavailable.
• File Encryption: Client-side AES-256 encryption ensures that files are securely stored and only accessible by authorized users.
• Access Control: Blockchain-based smart contracts handle file ownership, access rights, and transactions in a transparent, trustless manner.
• Incentive Mechanism: A token-based reward system incentivizes storage providers to maintain data availability.

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Technology Stack

Blockchain (Ethereum/Polkadot)

• Smart Contracts (Solidity): For managing file ownership, permissions, and transactions, ensuring transparent interactions between users and storage providers.

IPFS (InterPlanetary File System)

• Decentralized Storage: Files are distributed across nodes, leveraging the peer-to-peer nature of IPFS for tamper-proof, decentralized file hosting.

Master Location Storage

• Availability Guarantee: Files are stored in a centralized master location to ensure they are always available, even if the decentralized IPFS nodes are temporarily offline.

Web3.js

• Blockchain Interactions: Web3.js is used to interface between the front-end and the blockchain, allowing users to interact with the system (upload/download files, manage access rights, etc.).

React.js

• Frontend UI: A user-friendly React interface allows users to upload, view, and manage their files easily. It also integrates with Web3.js for blockchain transactions.

AES-256 Encryption

• Client-Side Encryption: Files are encrypted on the client side using AES-256 to ensure that only the uploader and authorized users can decrypt the file content.

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How It Works

1. File Upload: Users upload files to the system via the React.js front-end. Files are encrypted on the client side using AES-256 encryption for maximum privacy.
2. File Storage: The encrypted file is stored in two places:
   • IPFS Nodes: Decentralized storage for redundancy.
   • Master Location: A backup location to ensure 24/7 availability of files.
3. File Access and Sharing: Users can set access permissions using blockchain smart contracts. Only those with the correct permissions (as stored on the blockchain) can decrypt and download the file.
4. Incentives: Storage providers are incentivized through a token-based system to maintain uptime and host files across the IPFS network.

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Project Setup

To set up the project locally, follow these steps:

1. Clone the Repository:

   git clone [repository link]
   cd [project directory]
   npm install
   npx hardhat compile
   cd client
   npm install
   npm start
   
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Project Images

1. home page:

2. upload image:

3. Share the access of your image:

4. See your data and others data:

5. Approval of contracts: