brute_force.py

#!/usr/bin/env python

import numpy as np
import string 
import time
#TJCTF2018
def encrypt(str):
	np.random.seed(12345)
	arr=np.array([ord(c) for c in str])
	other =np.random.randint(1,5,(len(str)))
	arr=np.multiply(arr,other)

	b=[x for x in arr]
	lmao=[ord(x) for x in ''.join(['ligma_sugma_sugondese_'*5])]
	c=[b[i]^lmao[i] for i,j in enumerate(b)]
	return(''.join(bin(x)[2:].zfill(8) for x in c))
output="1001100001011110110100001100001010000011110101001100100011101111110100011111010101010000000110000011101101110000101111101010111011100101000011011010110010100001100010001010101001100001110110100110011101"
flag=list('tjctf{')
while True:
	for i in string.printable:
		if output.startswith(encrypt("".join(flag)+i)):
			flag.append(i)
			time.sleep(0.3)
			print ("".join(flag))