SHELL CTF 2022
SHELL CTF 2022 writeups
Sanity Check
10 points
Problem Description
Check the #announcement channel of the discord server.
Solution
Found the flag in the discord server
How to defeat a dragon
100 points
Problem Description
Dragonairre,the dragon with the hexadecimal head has attacked the village to take revenge on his last defeat,we need to get the ultimate weapon. Flag Format : SHELLCTF{}.
Given File
vault
Solution
Check file
Disassemble & Decompile & Reverse
main
undefine ...
CTF Introduction
CTF Introduction
CTF (Capture The Flag) is a competition of information security including types like Reverse, PWN, Web, Crypto, Forensic, etc. There are three main kinds of CTF competition systems: "Jeopardy", "Attack & Defense" and "King of Hill".
Data Mining Project 110_2
Data Mining Project 110_2
The slide in this post is written mainly in English. But I use Chinese to present the slide in this post. So I will use Chinese to explain through this post.
這篇文章中的簡報主要是用英文寫的，但是我在報告這個簡報時用的是中文，故這篇文章我會用中文來解釋此份簡報。
這份簡報撰寫於 110_2 學期，是「資料探勘與應用」課程的 Final Project。
簡報內容與說明
這次 project 的題目是關於「假新聞偵測」的實驗：
這邊是這次 project 的組員，考慮到可能有個資問題，我蓋掉了個資部分。總共有兩位組員，主題是我們一起想到的，我主要負責實驗設計、程式碼撰寫、簡報製作，另外一位組員主要負責資料尋找、提供實驗建議、程式碼建議，我們也有一起討論預測模型的選取：
這邊是目錄，內容依序為實驗動機、實驗目的、問題描述、實驗方法、實驗結果、結論、實際演示與參考資料：
實 ...
PIE affected by ASLR
PIE affected by ASLR
PIE (Position Independent Executable)
The instructions will be represented in relative address instead of absolute address.
ASLR (Address Space Layout Randomization)
Use random base address when the program is loaded to stack, heap, etc.
Purpose of my experiment
Understanding how ASLR affect the address.
Design experiment
Run a simple program (unstripped) and find where the "main function" in the program is. Does the address of the "main function" differs everytime I ...