N0PStopia has been attacked by PwnTopia! They installed a stealthy binary on one of our servers, but we did not understand what it does! Can you help? We saw some weird ICMP traffic during the atta...

CrypTopia is testing their next gen encryption algorithm. We believe that the way they implemented it may have a flaw… import os class CrypTopiaSC: @staticmethod def KSA(key, n): ...

Look who’s there! New students! Fine, this time we will focus on reverse engineering. This could help you against PwnTopia one day! I give you now a Python program and its output. Try to understand...

Hello young trainees! Today, we are studying digital forensics! This may be useful if one day you have to face PwnTopia… Here is a file, you have to find a way to read its content. Good luck! Th...

Ahoye! Here are the crypto newbies! Today, we are learning the basics of cryptography! Here is an encrypted message for you, try to decipher it. Learning this will help you on the day you will face...

This file has a flag in plain sight (aka “in-the-clear”). This was just a matter of downloading a file with no extension and opening it with Notepad++. It was just right there!

If I told you a word started with 0x70 in hexadecimal, what would it start with in ASCII? This flag was found by converting 0x70. There are lots of sites that will do this, like https://byte-tool...

When Cameron Snider was living in Europe like a dirty heathen, he used to frequent a popular Mexican restaurant. It was actually really good food. It’s quite a shame that it closed down a few years...