Reverse

A type of CTF challenge which involves reverse engineering tasks such as decompiling, understanding machine code and program logic, etc.

HKCERT CTF 2023 – Decompetition: Vitamin C++

A beginner-friendly writeup to reverse-engineering C++ a lá decompetition. Years of complex shenanigans condensed!

2023‑11‑16

12 minute read

_^N[Subtype Metaprogramming_^] is _^N[Mostly Harmless_^]

Inheritance go brrrrrrrr... abusing turing-complete typesystems to write fun programs in Python.

2023‑10‑02

13 minute read

HITCON 2023 – The Blade

Beginner-friendly writeup for a nifty Rust reversing challenge.

2023‑09‑20

13 minute read

GDB/GEF Cheatsheet

Quick command reference on one of the most powerful tools for dynamic analysis.

2023‑09‑11

7 minute read

DUCTF 2023 – Wrong Signal

You straight to oops(). Right away.

2023‑09‑04

3 minute read

HKCERT CTF 2022 – C++harming Website

A harming website? Hope it doesn't harm my sleep!

2022‑11‑15

5 minute read

DownUnderCTF 2022 – ezpz-rev

Grid puzzles aren't that easy.

2022‑09‑28

9 minute read

AOC 2021 Day 24 – No U

Finally a reverse engineering challenge in Advent of Code.

2022‑08‑25

6 minute read

TAMUctf 2022 – Labyrinth

Using CFGs to solve a control-flow maze.

2022‑04‑22