What I Learned It would be better trying many things, instead of detailed analysis, on CTF Simple strategy is good, but tuning parameters not good. Applying past genius works is definitely better. chronophobia (from idekCTF 2022) #!/usr/bin/env python3 from Crypto.Util.number import * import random import signal

Crypto (blocky4, remake) blocky4 part of source (task.py) def main(): signal.signal(signal.SIGALRM, handler) signal.alarm(60) key = get_key()

wringing_rings import sympy as sp import random import signal from secret import FLAG secret = random.SystemRandom().randint(1, 500_000) _MAX = 10 ** (len(str(secret)) - 1)