/tags/rsa/Recent content in RSA onHugo -- gohugo.ioThu, 17 Jul 2025 17:22:16 +0100/post/sr25-ok-computer/Thu, 17 Jul 2025 17:22:16 +0100/post/sr25-ok-computer/Click to expand challenge code from Crypto.Util.number import getPrime, bytes_to_long flag = "FL1TZ{*********}" p = getPrime(512) q = getPrime(512) n = p * q e = 5 m = bytes_to_long(flag.encode()) c = pow(m, e, n) data = { "n": n, "e": e, "c": c } with open("computer.json", "w") as f: import json json.dump(data, f, indent=4) Since this CTF was destined to be pretty advanced, I didn’t want beginner players to leave with 0 solves.