solidity-security

1# Solidity Security
2 
3Master smart contract security best practices, vulnerability prevention, and secure Solidity development patterns.
4 
5## When to Use This Skill
6 
7- Writing secure smart contracts
8- Auditing existing contracts for vulnerabilities
9- Implementing secure DeFi protocols
10- Preventing reentrancy, overflow, and access control issues
11- Optimizing gas usage while maintaining security
12- Preparing contracts for professional audits
13- Understanding common attack vectors
14 
15## Detailed patterns and worked examples
16 
17Detailed pattern documentation lives in `references/details.md`. Read that file when the navigation tier above is insufficient.
18 
19## Testing for Security
20 
21```javascript
22// Hardhat test example
23const { expect } = require("chai");
24const { ethers } = require("hardhat");
25 
26describe("Security Tests", function () {
27  it("Should prevent reentrancy attack", async function () {
28    const [attacker] = await ethers.getSigners();
29 
30    const VictimBank = await ethers.getContractFactory("SecureBank");
31    const bank = await VictimBank.deploy();
32 
33    const Attacker = await ethers.getContractFactory("ReentrancyAttacker");
34    const attackerContract = await Attacker.deploy(bank.address);
35 
36    // Deposit funds
37    await bank.deposit({ value: ethers.utils.parseEther("10") });
38 
39    // Attempt reentrancy attack
40    await expect(
41      attackerContract.attack({ value: ethers.utils.parseEther("1") }),
42    ).to.be.revertedWith("ReentrancyGuard: reentrant call");
43  });
44…