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🔐 Secure Data Ingestion Portal with Local Encryption

📋 Summary

Implements a comprehensive client-side encryption and blockchain integration system for secure data uploads to the Stellar Privacy Analytics platform, addressing all requirements from issue #9.

✨ Features Implemented

🔐 Client-Side Encryption

  • AES-256-GCM Encryption: Military-grade encryption using Web Crypto API
  • RSA Key Management: Asymmetric encryption for secure key exchange
  • SHA-256 Integrity Verification: File integrity checks before/after encryption
  • Secure Key Generation: Cryptographically secure random password generation

🛡️ Zero-Knowledge Proofs

  • WASM-Based Prover: Client-side ZK-proof generation
  • File Integrity Proofs: Prove data authenticity without revealing content
  • Data Ownership Proofs: Verify ownership without exposing data
  • Privacy Compliance Proofs: Demonstrate regulatory compliance

📊 Enhanced User Experience

  • Drag & Drop Interface: Intuitive file upload zone
  • Real-time Progress: Multi-part upload progress bars
  • File Format Support: CSV, JSON, and Parquet files up to 10GB
  • Stage-Based Processing: Visual feedback for encryption, proof generation, and upload

🔗 Stellar Blockchain Integration

  • Multi-Wallet Support: Freighter, Albedo, and xBull compatibility
  • Automatic Transaction Signing: Seamless blockchain integration
  • On-Chain Storage: Immutable storage of data metadata and proofs
  • Downloadable Receipts: Comprehensive receipts with verification URLs

🏗️ Architecture

File Input → Encryption → ZK-Proofs → Stellar Transaction → Receipt
    ↓           ↓           ↓              ↓                ↓
Integrity   AES-256     WASM         Wallet Signing   Download
Check      GCM        Prover        & Upload        PDF

📁 Files Added/Modified

New Files Created

  • frontend/src/lib/webCrypto.ts - Client-side cryptographic operations
  • frontend/src/lib/zkProof.ts - Zero-knowledge proof generation
  • frontend/src/lib/stellarWallet.ts - Stellar blockchain integration
  • frontend/src/components/SecureDataUpload.tsx - Main upload component
  • frontend/src/lib/__tests__/secureDataUpload.test.ts - Test suite
  • frontend/src/lib/README.md - Comprehensive documentation

Modified Files

  • frontend/src/pages/DataManagement.tsx - Integrated new upload component

🔒 Security Features

  • End-to-End Encryption: Data encrypted client-side before transmission
  • Zero-Knowledge Privacy: Proofs without revealing sensitive data
  • Blockchain Immutability: All transactions recorded on Stellar
  • Client-Side Processing: No plaintext exposure to servers

🧪 Testing

Comprehensive test suite covering:

  • Cryptographic operations and key generation
  • ZK-proof serialization/deserialization
  • Stellar wallet integration
  • File integrity verification
  • Receipt generation

📱 Browser Compatibility

  • Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
  • Requires Web Crypto API, File API, Fetch API, and WebAssembly support

🚀 Usage

import { SecureDataUpload } from './components/SecureDataUpload';

<SecureDataUpload 
  onUploadComplete={handleReceipt}
  maxFileSize={10 * 1024 * 1024 * 1024} // 10GB
  acceptedFormats={['.csv', '.json', '.parquet']}
/>

✅ Requirements Fulfilled

  • Client-side AES/RSA encryption using Web Crypto API
  • ZK-proof generation using WASM-based prover
  • Progress bar for multi-part uploads
  • Drag and drop zone for CSV/JSON files
  • SHA-256 file integrity verification
  • Stellar wallet transaction signing
  • Downloadable receipt with on-chain CID

🔗 Demo

The new secure upload can be accessed via the Data Management page, featuring:

  • Enhanced security indicators
  • Real-time upload progress
  • Wallet connection interface
  • Receipt download functionality

📖 Documentation

Comprehensive documentation available in frontend/src/lib/README.md including:

  • Architecture overview
  • API documentation
  • Usage examples
  • Troubleshooting guide

Closes #9