I created crypto challenges for fword ctf 2020 edition and here is a writeup for one of them. It’s about a biased nonces for weak ecdsa signatures. Description 500 points (6 solves) nc signit.fword.wtf 1337 Author: KOOLI Overview Connecting to the provided nc service we can see we have two possibilities: See available commands: ls cat run.py Execute command: ls : flag.txt run.