Python Challenge - Level 12
- Link: http://www.pythonchallenge.com/pc/return/evil.html
- Username: huge
- Password: file
Checking the source, the image is named as
evil2 and you will see:
Change suffix to
.gfx to download the file
Is it over? Try evil3.jpg, we got:
Really? "no more evils"? Let's try evil4.jpg. Depend on your browser, you may see nothing or an error message
The image "http://www.pythonchallenge.com/pc/return/evil4.jpg" cannot be displayed because it contains errors.
But, it is not 404! Let's take a closer look:
$ curl -u huge:file http://www.pythonchallenge.com/pc/return/evil4.jpg Bert is evil! go back!
OK, Bert is evil, whoever that is.
It is hard to tell what's going on inside the file.
>>> data = open("evil2.gfx", "rb").read() >>> data b'\xff\x89G\x89\xff\xd8PIP\xd8\xffNFN
Back to the problem's image, someone is dealing the cards into 5 stacks, and all the cards are ... 5.
>>> len(data) 67575
Let's try to split the data into 5, but "dealing" the bytes instead of cards...
>>> for i in range(5): ... open('%d.jpg' % i ,'wb').write(data[i::5])
Open the generated
4.jpg, you should see
data = open("evil2.gfx", "rb").read() for i in range(5): open('%d.jpg' % i ,'wb').write(data[i::5])