No, we did not win. I see that coming and took a screenshot during the game. BSides Ahmedabad CTF 2021 is organized by @zer0pts. That implies that players could spend a day happily working on the challenges. I enjoyed working on the challenges a lot. I'll go through the harder crypto challenges and the reversing challenge called Collapsed License in this blog post. SSSS.RNG Challenge Summary Let $p$ be a 512-bit prime and $a, b, g_0 \in [2, p)$.