Implementation Guide

Step-by-step instructions for implementing quantum-proof security

Implementation Overview

This guide provides detailed instructions for implementing CryptoGuardian's quantum-resistant security features in your token. The implementation process is divided into several phases to ensure a smooth transition and minimize risks.

1

Setting Up the Development Environment

Before implementing quantum-resistant features, you need to set up a proper development environment:

// Required development tools
npm install -g truffle
npm install @openzeppelin/contracts-upgradeable
npm install @openzeppelin/truffle-upgrades
npm install @openzeppelin/hardhat-upgrades
npm install --save-dev hardhat

Create a new project directory and initialize it:

mkdir quantum-token
cd quantum-token
npm init -y
npx hardhat init
2

Implementing the Post-Quantum Cryptography Library

Create a new file called PQCLibrary.sol to implement the post-quantum cryptographic functions:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

/**
 * @title Post-Quantum Cryptography Library
 * @notice Implementation of quantum-resistant cryptographic algorithms
 */
library PQCLibrary {
    // Lattice-based cryptography implementation
    function latticeBased(bytes memory data) public pure returns (bytes32) {
        // Simplified implementation of lattice-based hashing
        bytes32 result = keccak256(data);
        
        // Apply lattice transformation (simplified for demonstration)
        for (uint i = 0; i < 5; i++) {
            result = keccak256(abi.encodePacked(
                result,
                bytes32(uint256(result) ^ (uint256(result) >> 8))
            ));
        }
        
        return result;
    }
    
    // Hash-based cryptography implementation
    function hashBased(bytes memory data) public pure returns (bytes32) {
        // Simplified implementation of hash-based signature scheme
        bytes32 h1 = keccak256(data);
        bytes32 h2 = sha256(data);
        
        return keccak256(abi.encodePacked(h1, h2));
    }
    
    // Verification functions
    function verifyLattice(bytes memory message, bytes memory signature, bytes32 expectedHash) 
        public pure returns (bool) 
    {
        // Simplified verification for demonstration
        bytes32 computedHash = latticeBased(
            abi.encodePacked(message, signature)
        );
        
        return computedHash == expectedHash;
    }
    
    function verifyHash(bytes memory message, bytes memory signature, bytes32 expectedHash) 
        public pure returns (bool) 
    {
        // Simplified verification for demonstration
        bytes32 computedHash = hashBased(
            abi.encodePacked(message, signature)
        );
        
        return computedHash == expectedHash;
    }
}

Note: This is a simplified implementation for demonstration purposes. In a production environment, you would use more sophisticated lattice-based algorithms.

3

Implementing the Quantum Oracle Interface

Create the interface for the quantum oracle that will provide security parameters:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

/**
 * @title IQuantumOracle
 * @notice Interface for off-chain Oracle that provides quantum security parameters
 */
interface IQuantumOracle {
    function getQuantumProofParameters() external view returns (uint256 newLevel, bytes memory extraData);
}
4

Implementing the Quantum-Resistant Security Contract

Create the base contract for quantum-resistant security:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
import "./PQCLibrary.sol";

/**
 * @title QuantumResistantSecurityUpgradeable
 * @notice Base contract for quantum-resistant security features
 */
abstract contract QuantumResistantSecurityUpgradeable is Initializable {
    // Security fee in basis points (0.5%)
    uint256 public constant SECURITY_FEE_BP = 50;
    
    // Security parameters
    uint256 public quantumProofLevel;
    address public securityRevenueWallet;
    bytes public quantumProofData;
    uint256 public lastQuantumLevelUpdate;
    uint256 public quantumThreatAssessment;
    
    // Oracle interface
    IQuantumOracle public quantumOracle;
    
    // Events
    event QuantumProofLevelUpdated(uint256 newLevel);
    event QuantumOracleUpdated(address newOracle);
    
    // Mapping for quantum-resistant signatures
    struct QuantumResistantSignature {
        bytes32 messageHash;
        bytes signature;
        uint256 algorithm; // Algorithm identifier
    }
    
    mapping(address => QuantumResistantSignature) public qrSignatures;
    mapping(address => bool) public isExcludedFromSecurity;
    
    // Initialize function
    function __QuantumResistantSecurity_init(address _securityRevenueWallet) internal onlyInitializing {
        require(_securityRevenueWallet != address(0), "Invalid revenue wallet");
        securityRevenueWallet = _securityRevenueWallet;
        quantumProofLevel = 5; // Initial security level
        lastQuantumLevelUpdate = block.timestamp;
        quantumThreatAssessment = 3; // Initial threat assessment (low)
    }
    
    // Enhanced quantum-proof hash function
    function enhancedQuantumProofHash(bytes memory data) public view returns (bytes32) {
        // Use lattice-based cryptography for enhanced security
        bytes32 latticeHash = PQCLibrary.latticeBased(data);
        
        // Combine with traditional hash for hybrid security
        bytes32 traditionalHash = keccak256(data);
        
        // Mix the hashes with blockchain-specific data
        return keccak256(abi.encodePacked(
            latticeHash, 
            traditionalHash,
            block.timestamp,
            block.prevrandao,
            quantumProofLevel
        ));
    }
    
    // Function to register a quantum-resistant signature
    function registerQRSignature(bytes32 messageHash, bytes memory signature, uint256 algorithm) external {
        qrSignatures[msg.sender] = QuantumResistantSignature({
            messageHash: messageHash,
            signature: signature,
            algorithm: algorithm
        });
        
        emit QRSignatureRegistered(msg.sender, algorithm);
    }
    
    // Function to verify a quantum-resistant signature
    function verifyQRSignature(address user, bytes memory message, bytes memory signature) public view returns (bool) {
        QuantumResistantSignature memory qrs = qrSignatures[user];
        
        if (qrs.algorithm == 1) {
            // Lattice-based verification
            return PQCLibrary.verifyLattice(message, signature, qrs.messageHash);
        } else if (qrs.algorithm == 2) {
            // Hash-based verification
            return PQCLibrary.verifyHash(message, signature, qrs.messageHash);
        }
        
        return false;
    }
    
    // Function to update quantum security level via oracle
    function updateQuantumSecurityLevel() external {
        require(address(quantumOracle) != address(0), "Oracle not set");
        
        // Get latest parameters from oracle
        (uint256 newLevel, bytes memory extraData) = quantumOracle.getQuantumProofParameters();
        
        // Verify the update is legitimate
        require(newLevel > 0, "Invalid security level");
        
        // Update the quantum proof level
        uint256 oldLevel = quantumProofLevel;
        quantumProofLevel = newLevel;
        
        // Store additional data if provided
        if (extraData.length > 0) {
            quantumProofData = extraData;
        }
        
        // Update the threat assessment
        quantumThreatAssessment = _calculateThreatLevel(newLevel, extraData);
        
        // Record update time
        lastQuantumLevelUpdate = block.timestamp;
        
        // Adjust security fee if necessary
        if (newLevel > oldLevel) {
            _adjustSecurityFeeForThreat();
        }
        
        emit QuantumProofLevelUpdated(newLevel);
    }
    
    // Internal function to calculate threat level
    function _calculateThreatLevel(uint256 level, bytes memory data) internal pure returns (uint256) {
        if (data.length == 0) return level;
        
        // Extract threat assessment from oracle data
        uint256 extracted;
        assembly {
            extracted := mload(add(data, 32))
        }
        
        return extracted > 0 ? extracted : level;
    }
    
    // Adjust security fee based on threat level
    function _adjustSecurityFeeForThreat() internal virtual {
        // Implementation to be provided by derived contracts
    }
    
    // Apply security fee
    function _applySecurityFee(uint256 amount) internal view returns (uint256) {
        return amount * SECURITY_FEE_BP / 10000;
    }
    
    // Event for quantum signature registration
    event QRSignatureRegistered(address indexed user, uint256 algorithm);
}
5

Integrating with Your Token Contract

Integrate the quantum-resistant security features with your token contract:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
import "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
import "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";
import "./QuantumResistantSecurityUpgradeable.sol";

contract QuantumGuardianToken is 
    Initializable, 
    ERC20Upgradeable, 
    OwnableUpgradeable, 
    UUPSUpgradeable,
    QuantumResistantSecurityUpgradeable 
{
    function initialize() public initializer {
        __ERC20_init("QuantumGuardian", "QGT");
        __Ownable_init(msg.sender);
        __UUPSUpgradeable_init();
        __QuantumResistantSecurity_init(msg.sender);
        
        // Mint initial supply
        _mint(msg.sender, 1000000000 * 10 ** decimals());
    }
    
    function _authorizeUpgrade(address newImplementation) internal override onlyOwner {}
    
    // Override transfer function to apply quantum security
    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual override {
        // Apply quantum security checks
        if (!isExcludedFromSecurity[sender] && !isExcludedFromSecurity[recipient]) {
            // Generate quantum-resistant transaction hash
            bytes32 qrHash = enhancedQuantumProofHash(
                abi.encodePacked(sender, recipient, amount, block.timestamp)
            );
            
            // Store hash for future verification
            _storeQuantumTransactionHash(sender, recipient, qrHash);
            
            // Apply security fee
            uint256 fee = _applySecurityFee(amount);
            uint256 netAmount = amount - fee;
            
            // Transfer fee to security wallet
            super._transfer(sender, securityRevenueWallet, fee);
            
            // Transfer remaining amount
            super._transfer(sender, recipient, netAmount);
        } else {
            // Normal transfer for excluded addresses
            super._transfer(sender, recipient, amount);
        }
    }
    
    // Store quantum transaction hash (simplified implementation)
    function _storeQuantumTransactionHash(address from, address to, bytes32 hash) internal {
        // Implementation details would go here
        // This could involve storing in a mapping or emitting an event
    }
    
    // Implement security fee adjustment
    function _adjustSecurityFeeForThreat() internal override {
        // Implementation for dynamic fee adjustment based on threat level
    }
    
    // Function to exclude address from security fee
    function excludeFromSecurity(address account, bool excluded) external onlyOwner {
        isExcludedFromSecurity[account] = excluded;
    }
}
6

Deploying with Upgradeability

Deploy your quantum-resistant token with upgradeability using Hardhat:

// scripts/deploy.js
const { ethers, upgrades } = require("hardhat");

async function main() {
  console.log("Deploying QuantumGuardianToken...");
  
  // Deploy PQCLibrary first
  const PQCLibrary = await ethers.getContractFactory("PQCLibrary");
  const pqcLibrary = await PQCLibrary.deploy();
  await pqcLibrary.deployed();
  console.log("PQCLibrary deployed to:", pqcLibrary.address);
  
  // Deploy the token with upgradeability
  const QuantumGuardianToken = await ethers.getContractFactory("QuantumGuardianToken", {
    libraries: {
      PQCLibrary: pqcLibrary.address,
    },
  });
  
  const token = await upgrades.deployProxy(QuantumGuardianToken, [], {
    initializer: "initialize",
    unsafeAllowLinkedLibraries: true,
  });
  
  await token.deployed();
  console.log("QuantumGuardianToken deployed to:", token.address);
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

Run the deployment script:

npx hardhat run scripts/deploy.js --network testnet
7

Testing Your Implementation

Create test cases to verify your quantum-resistant implementation:

// test/quantum-token-test.js
const { expect } = require("chai");
const { ethers, upgrades } = require("hardhat");

describe("QuantumGuardianToken", function () {
  let token;
  let owner;
  let addr1;
  let addr2;
  
  beforeEach(async function () {
    // Deploy PQCLibrary
    const PQCLibrary = await ethers.getContractFactory("PQCLibrary");
    const pqcLibrary = await PQCLibrary.deploy();
    
    // Deploy token
    const QuantumGuardianToken = await ethers.getContractFactory("QuantumGuardianToken", {
      libraries: { PQCLibrary: pqcLibrary.address },
    });
    
    [owner, addr1, addr2] = await ethers.getSigners();
    
    token = await upgrades.deployProxy(QuantumGuardianToken, [], {
      initializer: "initialize",
      unsafeAllowLinkedLibraries: true,
    });
  });
  
  it("Should apply security fee on transfers", async function () {
    // Transfer tokens from owner to addr1
    const transferAmount = ethers.utils.parseEther("100");
    await token.transfer(addr1.address, transferAmount);
    
    // Calculate expected amount after fee (0.5%)
    const expectedFee = transferAmount.mul(50).div(10000);
    const expectedAmount = transferAmount.sub(expectedFee);
    
    // Check balances
    expect(await token.balanceOf(addr1.address)).to.equal(expectedAmount);
    expect(await token.balanceOf(owner.address)).to.be.gt(
      ethers.utils.parseEther("1000000000").sub(transferAmount)
    );
  });
  
  it("Should exclude addresses from security fee", async function () {
    // Exclude addr1 from security fee
    await token.excludeFromSecurity(addr1.address, true);
    
    // Transfer tokens to addr1
    const transferAmount = ethers.utils.parseEther("100");
    await token.transfer(addr1.address, transferAmount);
    
    // Check that full amount was received (no fee)
    expect(await token.balanceOf(addr1.address)).to.equal(transferAmount);
  });
  
  it("Should generate quantum-resistant hash", async function () {
    // Test the hash function
    const testData = ethers.utils.toUtf8Bytes("test data");
    const hash = await token.enhancedQuantumProofHash(testData);
    
    // Hash should be a valid bytes32
    expect(hash).to.not.equal(ethers.constants.HashZero);
  });
});

Run the tests:

npx hardhat test

Important Implementation Notes

  • Security Audits: Before deploying to mainnet, have your implementation audited by security professionals with expertise in quantum-resistant cryptography.
  • Gas Optimization: The quantum-resistant functions may consume more gas than traditional functions. Consider optimizing for gas efficiency.
  • Oracle Implementation: You'll need to implement the off-chain oracle service that provides quantum security parameters.
  • Testing: Thoroughly test on testnets before mainnet deployment.
  • Upgradeability: The UUPS pattern allows for future upgrades as quantum computing advances.

Ready to Deploy Your Quantum-Resistant Token?

Review our documentation for detailed information on deployment and maintenance.

View Documentation