PHDays 8: EtherHack Contest Writeup

PHDays 8: EtherHack Contest Writeup

This year at PHDays security conference a new contest called EtherHack was held. The goal was to be the first to solve all tasks which featured smart contract vulnerabilities. Here we present the detailed explanation of intended solutions.Azino 777The goal of this level is to win the lottery and hit ... Read More
Predicting Random Numbers in Ethereum Smart Contracts

Predicting Random Numbers in Ethereum Smart Contracts

Ethereum has gained tremendous popularity as a platform for initial coin offerings (ICOs). However, it is used in more than just ERC20 tokens. Roulettes, lotteries, and card games can all be implemented using the Ethereum blockchain. Like any blockchain implementation, Ethereum is incorruptible, decentralized, and transparent. Ethereum allows running Turing-complete ... Read More
ZeroNights ICO Hacking Contest Writeup

ZeroNights ICO Hacking Contest Writeup

Prior to ZeroNights security conference, an ICO hacking contest had been announced. The first three contestants to solve the tasks could win invites to the conference. My motivation to participate in the contest was driven by the interest in smart contract security which is gaining popularity in various CTFs nowadays.The ... Read More
The Ethernaut CTF Writeup

The Ethernaut CTF Writeup

Zeppelin Solutions invited everybody to participate in their smart contract CTF competition called “The Ethernaut” which started together with the annual DevCon 3 conference held in Cancun. First five contestants to solve all tasks shared the prize pool of 10000$.For each task the Ethernaut bot created a contract on Ropsten ... Read More