crypt5

#!/usr/bin/env python
# -*- coding: utf-8 -*-
from selenium import webdriver

cipher = "00 0c 3a 1e 52 02 53 02 51 0c 5d 56 51 5a 5f 5f 5a 51 00 05 53 56 0a 5e 00 52 05 03 51 50 55 03 04 52 04 0f 0f 54 52 57 03 52 04 4e"

profile=webdriver.FirefoxProfile()
driver=webdriver.Firefox(profile)

charsets = "}abcdef1234567890"
s1 = "<h1>Smart Cipher System</h1>"
driver.get('http://bow.chal.mmactf.link/~scs/crypt5.cgi')

flag = "MMA{"
while 1:
    for c in charsets:
        name = driver.find_element_by_name('s')
        name.clear()
        name.send_keys(flag+c)
        name.submit()
        source = driver.page_source
        hex_text = source[353:353-1+3*len(flag)] # 353 la vi tri tai hex thu 2 tro di trong source
        if hex_text == cipher[:len(hex_text)]:
            flag = flag+c
            if c == "}":
                print flag
                exit(1)