Tags: crypto
Rating: 5.0
The trick to this was getting it to attack every team durring the tick period.
There were a lot of teams, (credit to organisers, the network was pretty good)
The api also failed a lot so you had to account for that
read the full writeup here http://pastebinthehacker.blogspot.com.au/2017/03/ictf-no-rsa.html