This project implements a fully decentralized encrypted file vault, enabling secure file upload, storage, and retrieval using:

• AES-256 encryption for file content
• RSA-2048 OAEP for encrypting the AES key
• IPFS for decentralized storage of encrypted files
• Ethereum Blockchain (Ganache) for storing metadata
• Streamlit UI for user-friendly interaction

User (Streamlit UI)
        │
        ▼
AES Encrypt File → RSA Encrypt AES Key
        │
        ▼
Upload Encrypted File → IPFS
        │
        ▼
Store metadata on Ethereum:
  • filename
  • SHA256 hash
  • IPFS CID
  • RSA-encrypted AES key
        │
        ▼
Retrieve (CID) → Recompute Hash → Blockchain Lookup
        │
        ▼
RSA Decrypt AES Key → AES Decrypt File → Download

• AES-256 CBC file encryption
• RSA-2048 key encryption

• Encrypted files stored on IPFS
• Metadata stored on blockchain
• Tamper-proof and censorship-resistant

• Sidebar navigation
• Upload → Encrypt → IPFS → Blockchain
• View all encrypted files
• One-click decrypt & download
• Clean dark-themed UI

• Retrieve files using IPFS CID
• Hash auto-computed for blockchain lookup
• Fully automated decryption flow

EncryptedVault/
│
├── crypto_utils/
│   ├── streamlit_app.py
│   ├── ipfs_uploader.py
│   ├── aes_encryption.py
│   ├── aes_hybrid_blockchain_multithread.py
│   ├── public.pem
│   └── private.pem
│
├── blockchain/
│   └── FileVaultWithIPFS.sol
│
└── test_files/

Create a requirements.txt:

streamlit==1.32.0
web3==6.11.4
requests==2.31.0
pycryptodome==3.20.0
pathlib==1.0.1

Install using:

pip install -r requirements.txt

git clone <your_repo_url>
cd EncryptedVault

python -m venv encry
encry\Scripts\activate      # Windows
source encry/bin/activate   # Linux/Mac

pip install -r requirements.txt

Ensure RPC:

http://127.0.0.1:7545

Deploy FileVaultWithIPFS.sol using Remix, copy contract address into:

CONTRACT_ADDRESS = "0xYourContractAddressHere"

openssl genrsa -out private.pem 2048
openssl rsa -in private.pem -pubout > public.pem

Update ipfs_uploader.py:

PINATA_API_KEY = "your_api_key"
PINATA_SECRET_API_KEY = "your_secret_key"

streamlit run crypto_utils/streamlit_app.py

Then open:

http://localhost:8501

• Select file
• AES encrypt
• RSA wrap AES key
• Upload encrypted file to IPFS
• Store metadata on blockchain

• Load blockchain events
• View all encrypted files & CIDs

• Select file
• App retrieves CID
• Computes correct SHA256
• Fetches blockchain record
• Decrypts and downloads file

• Multi-user RSA sharing
• Preview thumbnails for images/videos
• Local IPFS node integration
• Folder batch encryption
• User authentication / password-protected keys

MIT License

Developed using:

• Python
• Streamlit
• Solidity
• Web3.py
• IPFS
• AES/RSA cryptography