Coming soon: Stripe CTF3, distributed systems edition
The last stripe CTF was amazing, I managed to be one of the first hundred or so to get to the last stage but got utterly stumped by it. The solution involved tracking the incrementing port numbers of a Linux server as a kind of side channel attack to bruteforce a password if I remember correctly - a very interesting puzzle.The whole thing was very fun, I highly recommend anyone interested in security to give it a go. The XSS challenges were also cool: they ran a headless webkit browser to emulate a user so your XSS code actually did something.