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 


Original writeup (http://pastebinthehacker.blogspot.com.au/2017/03/ictf-no-rsa.html).