https://buuoj.cn/challenges#[CFI-CTF%202018]IntroToPE NET逆向 找到 public bool verifyPasswd() { bool result = false; bool flag = Convert.ToBase64String(Encoding.UTF8.GetBytes(this.passwd)) == "Q0ZJey5OZXRDI18xc19AdzNzMG0zfQ=="; if (flag) { result = true; } return result; } 就行了 CFI{.NetC#_1s_@w3s0m3} (怎么感觉最近一天一题变得这么水了)