## TL;DR :
- The Curve given was Parabola
- we had 4 points ( Enough to to recover prime P)
- calculate shared Secret and decrypt Flag

Original writeup (https://gitcdn.xyz/cdn/0verflowme/faf80e911f13a5a264bc45a1870870e3/raw/e242d3ed9b334a962e2420776676ba08edf23e95/HomeBrew.html).