Project_Setup_and_Implementation_that helps in smart contract.pptx

this helps is NS3 to smart contract

1. Project Setup and Security Implementation AES Encryption, CP-ABE Access Control, and Blockchain Integration

2. Step 1: Project Setup Install necessary libraries: npm install mongoose dotenv cryptojs openabe Create .env file: MONGO_URI=mongodb+srv://<username>:<password>@cluster.mongodb.net/<database>

3. Step 2: File Placement and Configuration 1. Database Configuration (db.js) require('dotenv').config(); const mongoose = require('mongoose'); const connectDB = async () => { ... };

4. Step 3: AES Encryption (encryption.js) const crypto = require('crypto'); const algorithm = 'aes-256-cbc'; const key = crypto.randomBytes(32); exports.encrypt = (text) => { ... };

5. Step 4: Model Creation (HealthcareData.js) const mongoose = require('mongoose'); const HealthcareDataSchema = new mongoose.Schema({ encryptedData: String, iv: String, createdAt: { type: Date, default: Date.now } });

6. Step 5: CP-ABE Access Control const { OpenABE } = require('openabe'); exports.encryptWithPolicy = async (policy, data) => { ... }; exports.decryptWithAttributes = async (attributes, data) => { ... };

7. Step 6: Chatbot Integration chatbot.on('message', async (msg) => { const entry = await HealthcareData.findById(msg.id); const data = decrypt(entry.encryptedData, entry.iv); chatbot.sendMessage(msg.chat.id, `Data: ${data}`); });

8. Step 7: Blockchain Verification const axios = require('axios'); const verifyAccess = async (hash) => { const url = `https://nanexplorer.com/api/block/${hash}`; const response = await axios.get(url); return response.data ? true : false; };

9. Conclusion 1. Encrypt data before saving to MongoDB. 2. Use CP-ABE to control access. 3. Ensure chatbot only decrypts for authorized users. 4. Verify access attempts using Nano blockchain.