The document outlines a project setup for secure data handling using AES encryption, CP-ABE access control, and blockchain integration. It includes step-by-step instructions to install necessary libraries, configure the database, implement encryption, create models, integrate a chatbot, and verify access through blockchain. Key conclusions emphasize encrypting data, controlling access, ensuring authorized user decryption, and utilizing blockchain for access verification.

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.