This challenge implements a simple virtual machine with only 5 instructions. Your task is to write a program...

It’s always fun to solve a challenge without even running a binary file. Sometimes this is necessary because...

This crackme doesn’t require a lot of reversing skills but provides plenty of opportunities to learn new tools...

This is another example from HTB that implements “decryption” of code at runtime (same as “Partial Encryption” crackme...

I always thought picoCTF was the simplest CTF, but it seems like “it depends” as usual. This problem...

My world will never be the same. This crackme introduced me to angr, which is a Swiss army...