#seccon2021 #xornet from Crypto.Util.number import bytes_to_long, long_to_bytes from Crypto.Util.Padding import pad import random from secret import msg1, msg2, flag flag = pad(flag, 96) flag1 = flag[:48] flag2 = flag[48:] # P-384 Curve p =…

#seccon2021 import os flag = os.getenv("FLAG", "fake{fakeflag_blahblah}") x = int.from_bytes(flag.encode(), "big") p = random_prime(1 << int(x.bit_length() * 2.5)) Fp = GF(p) params = [] while len(params) != 6: try: y = randint(2, x) a = r…

#seccon2021 #kurenaif import base64 from Crypto.Cipher import AES from Crypto.Random import get_random_bytes from Crypto.Util.Padding import pad, unpad from Crypto.Util.strxor import strxor from flag import flag import signal key = get_ran…

#kurenaif #seccon2021 from Crypto.Util.number import * from flag import flag p = getStrongPrime(512) q = getStrongPrime(512) n = p*q mid = len(flag) // 2 e = 65537 m1 = int.from_bytes(flag[:mid], byteorder='big') m2 = int.from_bytes(flag[m…

#xornet #seccon2021 from Crypto.Util.number import bytes_to_long, getPrime, getRandomInteger, isPrime from secret import flag def create_prime(p_bit_len, add_bit_len, a): p = getPrime(p_bit_len) p_bit_len2 = 2*p_bit_len // 3 + add_bit_len …

#seccon2021 #kurenaif import signal from Crypto.Util.number import long_to_bytes, bytes_to_long, getPrime import random from flag import flag message = b"" for _ in range(128): message += b"o" if random.getrandbits(1) == 1 else b"O" M = ge…