수요없는공급

1. 문제 설명The contract below represents a very simple game: whoever sends it an amount of ether that is larger than the current prize becomes the new king. On such an event, the overthrown king gets paid the new prize, making a bit of ether in the process! As ponzi as it gets xD Such a fun game. Your goal is to break it. When you submit the instance back to the level, the level is going to reclaim..

1. 문제 설명Unlock the vault to pass the level! // SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract Vault { bool public locked; bytes32 private password; constructor(bytes32 _password) { locked = true; password = _password; } function unlock(bytes32 _password) public { if (password == _password) { locked = false; } }} 해당 컨트랙트의 locke..

1. 문제 설명Some contracts will simply not take your money ¯\\_(ツ)_/¯ The goal of this level is to make the balance of the contract greater than zero. Things that might help: - Fallback methods - Sometimes the best way to attack a contract is with another contract. - See the "?" page above, section "Beyond the console" // SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract Force { /* ..

1. 문제 설명The goal of this level is for you to claim ownership of the instance you are given.  Things that might help- Look into Solidity's documentation on the delegatecall low level function, how it works, how it can be used to delegate operations to on-chain libraries, and what implications it has on execution scope.- Fallback methods- Method ids // SPDX-License-Identifier: MITpragma solidity ^..

1. 문제 설명The goal of this level is for you to hack the basic token contract below. You are given 20 tokens to start with and you will beat the level if you somehow manage to get your hands on any additional tokens. Preferably a very large amount of tokens. Things that might help: - What is an odometer? // SPDX-License-Identifier: MITpragma solidity ^0.6.0;contract Token { mapping(address => ui..

Claim ownership of the contract below to complete this level. Things that might help - See the "?" page above, section "Beyond the console" 해당 컨트랙트의 소유권을 빼앗으면 이번 레벨을 통과할 수 있다. // SPDX-License-Identifier: MITpragma solidity ^0.8.0;contract Telephone { address public owner; constructor() { owner = msg.sender; } function changeOwner(address _owner) public { if (tx.origin !..

이번 11월 14일(목)에 열린 UDC 2024 컨퍼런스를 참여하였다. 전체 세션에는 소식이 늦어 참여하지 못하였지만 선착순으로 '웹3 보안 토크' 세션을 들을 수 있는 기회가 생겨 해당 프로그램을 간신히 들을 수 있었다. 이 특별 프로그램은 정재용 책임자님의 발표와 티오리 박세준 대표님의 발표, 그리고 업사이드 아카데미 1기 우승팀 분들의 발표로 이루어져 있었다. 첫 번째로 정재용 정보보호최고책임자님의 발표에서 들었던 내용 중 인상깊었던 내용들을 조금이나마 정리해보겠다.보안 keynoteWeb 3.0 Security Incidents웹3 보안 사고들에 대한 통계를 보여주시며 공격 기법들과 그로 인한 피해 자산들을 보여주셨다.공격 방법들은 다음과 같다.Contract Vulnerability (48.3%..

This is a coin flipping game where you need to build up your winning streak by guessing the outcome of a coin flip. To complete this level you'll need to use your psychic abilities to guess the correct outcome 10 times in a row.  Things that might help- See the "?" page above in the top right corner menu, section "Beyond the console"section "Beyond the console" - https://ethernaut.openzeppelin.c..

Claim ownership of the contract below to complete this level.  Things that might help- Solidity Remix IDEDifficulty: ★☆☆☆☆아래의 컨트랙트의 소유권을 가져오면 되는 문제이다.(Remix IDE라는 것이 도움을 줄 수 있을 것이라고 한다) // SPDX-License-Identifier: MITpragma solidity ^0.6.0;import "openzeppelin-contracts-06/math/SafeMath.sol";contract Fallout { using SafeMath for uint256; mapping(address => uint256) allocations; address ..

Look carefully at the contract's code below.You will beat this level if1. you claim ownership of the contract2. you reduce its balance to 0  Things that might help- How to send ether when interacting with an ABI- How to send ether outside of the ABI- Converting to and from wei/ether units (see help() command)- Fallback methodsDifficulty: ★☆☆☆☆해당 컨트랙트의 소유권을 획득하고 그것의 잔고를 0으로 만들어야 하는 문제이다. // SPDX-..