gistfile1.txt

from requests import *
from base64 import *

block_size = 16

url = "http://167.99.161.30:8080"

def get_cookies(name):
	data = {"name": name}
	s = Session()
	r = s.post(url + "/please-let-me-in" ,data=data)
	return s.cookies["state"]

def get_flag(payload):
	cookie = {"state":b64encode(payload)}
	r = get(url,cookies=cookie)
	return r.text

cookie = get_cookies("a"*29)
print "Cookie: ",cookie
payload = b64decode(cookie)[0:47] + chr( ord(b64decode(cookie)[47]) ^ ord("0") ^ ord("1") ) + b64decode(cookie)[48:]
print get_flag(payload)