Autonomous Data Release Method
Developed by ARADSTERDAM DAO
Introduction
- Objective: Develop a secure and autonomous method to release data to the public unless specific actions are performed within a defined timeframe.
- Key Components:
- Post-Quantum Encryption
- Shamir’s Secret Sharing
- Decentralized Storage (Arweave, IPFS)
- Privacy-Oriented Smart Contracts (Ethereum)
- Chainlink Oracles for Automation
Overview
- Post-Quantum Encryption: Ensures encryption is resistant to quantum computing threats.
- Shamir’s Secret Sharing: Secures AES keys with threshold encryption for decentralization.
- Decentralized Storage: Utilizes Arweave and IPFS for immutable and censorship-resistant data storage.
- Privacy-Oriented Smart Contracts: Deploys on Ethereum with zk-SNARKs for privacy-preserving computations.
- Chainlink Oracles: Automates triggers (e.g., login status) for key retrieval and data release.
Detailed Implementation Steps
Step 1: Encrypt Data and AES Key
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Encrypt Data with AES-256:
openssl enc -aes-256-cbc -salt -in data.txt -out data.enc -k secretkey
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Shard AES Key with Shamir’s Secret Sharing:
from secretsharing import SecretSharer # Split AES key into shares shares = SecretSharer.split_secret('secretkey', 5, 3) # 5 shares, 3 required for reconstruction for i, share in enumerate(shares): with open(f'share_{i+1}.txt', 'w') as f: f.write(share)
Step 2: Upload Encrypted Data
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Upload to Arweave:
arweave upload data.enc
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Upload to IPFS:
ipfs add data.enc
Step 3: Deploy Privacy-Oriented Smart Contract
- Example Solidity Contract:
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/access/Ownable.sol"; import "@openzeppelin/contracts/utils/Counters.sol"; import "./Verifier.sol"; // zk-SNARK verifier contract contract AutonomousDataRelease is Ownable { using Counters for Counters.Counter; struct Document { string arweaveCID; string ipfsHash; uint256 timestamp; string[] keyShares; } Counters.Counter private _documentIds; mapping(uint256 => Document) private _documents; Verifier private verifier; event DocumentPublished(uint256 indexed documentId, string arweaveCID, string ipfsHash, uint256 timestamp); constructor(address verifierAddress) { verifier = Verifier(verifierAddress); } function addDocument( string memory arweaveCID, string memory ipfsHash, string[] memory keyShares, uint[2] memory a, uint[2][2] memory b, uint[2] memory c, uint[1] memory input ) public onlyOwner { require(verifier.verifyProof(a, b, c, input), "Invalid proof"); _documentIds.increment(); uint256 documentId = _documentIds.current(); _documents[documentId] = Document({ arweaveCID: arweaveCID, ipfsHash: ipfsHash, timestamp: block.timestamp, keyShares: keyShares }); emit DocumentPublished(documentId, arweaveCID, ipfsHash, block.timestamp); } function getDocument(uint256 documentId) public view returns (string memory, uint256, string memory, string memory, string[] memory) { Document storage doc = _documents[documentId]; return (doc.arweaveCID, doc.ipfsHash, doc.timestamp, doc.keyShares); } }
Step 4: Upload Encrypted Key Shares to Blockchain
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Procedure to Encrypt and Upload Key Shares:
from Crypto.Cipher import AES import base64 # Function to pad the key shares def pad(s): return s + (32 - len(s) % 32) * chr(32 - len(s) % 32) key = b'Sixteen byte key' # AES encryption key (must be 16, 24, or 32 bytes) for i in range(1, 6): with open(f'share_{i}.txt', 'r') as f: share = f.read() cipher = AES.new(key, AES.MODE_CBC) ct_bytes = cipher.encrypt(pad(share).encode('utf-8')) iv = base64.b64encode(cipher.iv).decode('utf-8') ct = base64.b64encode(ct_bytes).decode('utf-8') encrypted_share = iv + ct with open(f'encrypted_share_{i}.txt', 'w') as ef: ef.write(encrypted_share)
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Upload Encrypted Key Shares to Ethereum:
function storeKeyShares(string[] memory encryptedKeyShares) public onlyOwner { for (uint i = 0; i < encryptedKeyShares.length; i++) { // Store each encrypted key share in the smart contract _keyShares.push(encryptedKeyShares[i]); } }
Step 5: Automate with Chainlink Oracles
- Register Contract with Chainlink Keepers:
- Automate key retrieval and data release based on predefined triggers (e.g., login activity).
Triggers to Stop Decryption
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Login Activity:
- Require periodic login to halt data release.
- Chainlink oracles monitor login status; absence triggers decryption.
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Multi-Signature Approval:
- Require multiple approvals to stop data release.
- Smart contract verifies signatures before halting decryption.
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External Event:
- Trigger based on specific blockchain events or transactions.
- Automated by Chainlink oracles for timely intervention.
Secure Storage of Keys on Blockchain
- Encryption: AES-256 encrypts the shares before upload.
- On-Chain Storage: Upload encrypted shares to Ethereum as strings.
- Access Control: Only owner or authorized parties can access and retrieve key shares.
Security and Privacy Features
- Robust Encryption: AES-256 for data and Shamir’s Secret Sharing for AES key.
- Decentralized Storage: Arweave and IPFS ensure data immutability and censorship-resistance.
- Privacy-Preserving Smart Contracts: Ethereum with zk-SNARKs enables confidential transactions.
- Automated Execution: Chainlink Oracles automate data release triggers securely.
Example Use Case
- Scenario: Release encrypted data publicly if a user does not log in within a specified timeframe.
- Implementation: Chainlink oracles monitor login status; upon failure to log in, smart contract retrieves key shares and releases data.
Conclusion
The Autonomous Data Release Method developed by ARADSTERDAM DAO ensures secure, automated, and privacy-focused data release leveraging blockchain, decentralized storage, and smart contracts. By integrating advanced encryption, decentralized infrastructure, and automated triggers, the method provides a robust solution for managing and releasing sensitive data autonomously.
Questions?
- Contact: [ARADSTERDAM DAO] https://aradsterdam.org/
This presentation provides a technical overview of the method, emphasizing security, automation, and privacy in data release scenarios managed by ARADSTERDAM DAO.