0x0G CTF: Authme (Author Writeup)

david@systemoverlord.com (David Tomaschik) — Thu, 12 Aug 2021 00:00:00 +0000

0x0G is Google’s annual “Hacker Summer Camp” event. Normally this would be in Las Vegas during the week of DEF CON and Black Hat, but well, pandemic rules apply. I’m one of the organizers for the CTF we run during the event, and I thought I’d write up solutions to some of my challenges here.

The first such challenge is authme, a web/crypto challenge. The description just wants to know if you can auth as admin and directs you to a website. On the website, we find a link to the source code, to an RSA public key, and a login form.

0x0G CTF: gRoulette (Author Writeup)

david@systemoverlord.com (David Tomaschik) — Thu, 12 Aug 2021 00:00:00 +0000

gRoulette is a simplified Roulette game online. Win enough and you’ll get the flag. The source code is provided, and the entire thing is run over a WebSocket connection to the server.

0x0G on System Overlord

0x0G CTF: Authme (Author Writeup)

0x0G CTF: gRoulette (Author Writeup)