Python Challenge - Level 26

• Link: http://www.pythonchallenge.com/pc/hex/decent.html
• Username: butter
• Password: fly

Problem

Hurry up, I'm missing the boat

Solution

Send the email to [email protected] and get the response:

From: [email protected] Subject: Re: sorry Date:

Never mind that.

Have you found my broken zip?

md5: bbb8b499a0eef99b52c7f13f4e78c24b

Can you believe what one mistake can lead to?

As indicated there's only "one mistake". Try to modify the data and check by md5 code.

import hashlib

def search_and_save():
    for i in range(len(data)):
        for j in range(256):
            newData = data[:i] + bytes([j]) + data[i + 1:]
            if hashlib.md5(newData).hexdigest() == md5code:
                open('repaired.zip', 'wb').write(newData)
                return

md5code = 'bbb8b499a0eef99b52c7f13f4e78c24b'
data = open('maze/mybroken.zip', 'rb').read()
search_and_save()

The result is a picture with word "speed", plus the text:

Hurry up, I'm missing the boat

The final answer is speedboat

Next Level

http://www.pythonchallenge.com/pc/hex/speedboat.html

Python 2 to 3

• md5 module is deprecated, use hashlib.md5()
• open() without explicitly specifying rb will use the default utf-8 codec for decoding.