In this challenge we have an ELF binary that has been compiled for the aarch64 architecture. We do not need to reverse engineer the file because the source is already provided. First of all, we ex...

In this challenge we are given an ELF64 binary. The challenge consists of getting remote code execution and reading the flag. We need to determine whether a given graph is Eulerian to get a prize (...

Chains is a reversing challenge that got 20 solves. We are given a stripped aarch64 (ARM 64 bit) ELF binary called chains: $ file chains chains: ELF 64-bit LSB pie executable, ARM aarch64, versio...

RUN! is a reversing challenge that got 15 solves. We are a provided a Windows PE binary called wamup.exe and the following description: keygenme now! nc bin.q21.ctfsecurinets.com 2324 If we...

Anime is love was one of the forensics challenges in Codefest CTF 2020. The challenge description reads: You know what to do. Author:pseudo_bot#7514 file: anime.jpg The file we are given looks ...

telephone was one of the forensics challenges in codefest ctf 2021. The challenge has some forensics elements but is mostly stego. We get a PNG image named telephone.png: From here we run the ...

For this challenge we are given the following image and asked to find a flag with the format flag{something_here}: Since is a scripting challenge, let’s start parsing the image. import cv2 import...

tooeasy is a reversing challenge with 17 solves. The description reads: I mean lets get to basics, I have my tried to get in how real malware authors would hide there stuff but still this chall ...

Recently I published a blog post on libbus, a small library I wrote to handle distributed message passing between threads. The library makes use of atomic functions to ensure synchronism. These ope...

Earlier this week I wrote, over the course of an evening, a very simple library to implement basic shared message passing called libbus. In this blog post I want to delve a bit deeper into the rati...