作問するときに気をつけること
#cyber_apocalypse_ctf_2021 from Crypto.Util.number import getPrime, bytes_to_long from random import randint FLAG = b'CHTB{??????????????????????????????????}' flag = bytes_to_long(FLAG) def keygen(): p, q = getPrime(1024), getPrime(1024) …
#wanictf2021spring from Crypto.Util.number import bytes_to_long with open("flag.txt", "rb") as f: flag = f.read() flag = bytes_to_long(flag) assert flag <= 10 ** 103 upper_bound = 300 while True: try: mod = int(input("Mod > ")) if mod > up…
#corctf2021 from Crypto.Util.number import bytes_to_long, getStrongPrime from random import randrange from secret import flag LIMIT = 64 def gen(): p = getStrongPrime(512) g = randrange(1, p) return g, p def main(): g, p = gen() print("g:"…
#cyber_apocalypse_ctf_2021 from Crypto.Util.number import bytes_to_long from secrets import FLAG,p,q N = p**3 * q e = 0x10001 c = pow(bytes_to_long(FLAG),e,N) print(f'Flag: {hex(c)}') # Hint w = 25965460884749769384351428855708318685345170…
