During one of our earlier escapades, we found ourselves looking at the vortex wargame from overthewire.org. We started on Level 0, which seemed easy enough: connect to a host, read 4 integers, add them together and send them back.
The logical solution would be to write a short program in the language of your choice which did the above. As it turns out, Nima’s language of choice was bash.
Behold – vortex 0, on hard mode:
(Download this solution here).