Lock_Chain

Lock_Chain is a decentralized smart lock system utilizing blockchain technology for secure and automated access control. This project combines Citrea and iExec technologies to ensure a privacy-focused, secure, and decentralized approach to smart lock management.

Overview

Lock_Chain uses Citrea to tokenize physical locks as Real World Assets (RWAs) through NFTs, ensuring the lock's ownership is securely stored on the blockchain. iExec handles off-chain cryptographic key management and ownership verification, ensuring that only the authorized NFT holder can unlock the door.

How It Works

1. Lock Creation and NFT Minting: Citrea mints an NFT representing the lock ownership.
2. Secure Unlock Requests: The user sends an encrypted unlock request using Ed25519 encryption.
3. Key Management: iExec generates and verifies cryptographic keys.
4. Ownership Verification: iExec validates ownership by checking the user's public key against the NFT data.
5. Door Unlock and Notifications: Upon successful verification, the door unlocks, and an email notification is sent.

Diagrams

The following diagrams illustrate the workflow and technical architecture of the Lock_Chain system:

Sequence Diagram

The sequence diagram outlines the step-by-step interactions among the actor, Citrea, Door, and iExec components:

• The actor initiates the lock creation via the mobile app.

• Citrea mints an NFT representing the lock ownership and transfers it to the user.

• To unlock the door, the actor sends an encrypted message.

• iExec generates and verifies the cryptographic key, checking ownership against the NFT data.

• If ownership is confirmed, the door unlocks and an email notification is sent.

  

Architecture Diagram

The architecture diagram provides an overview of the system's structure:

• The actor interacts with the mobile app to perform lock-related actions.

• Citrea manages the NFT-based lock ownership, tokenizing it as a Real World Asset (RWA).

• The lock communicates with an API and UI for control.

• iExec handles door key management and cryptographic verification.

  

Technologies Used

• Citrea: For NFT-based lock ownership representation.
• iExec: For secure off-chain computation and key management.

Future Goals

• Develop a working prototype using a Raspberry Pi, electronic lock, and 3D printer.
• Collaborate with university consultants and interns for testing and refinement.
• Seek investors for market expansion.