Fahrenheit 451

Mean white and unseen!

Problem

Your SUBSTITUTE teacher accessed his copy of Fahrenheit 451 over his windows network share. Can you find the flag your friend hid in the book?

Standard Flag Format auctf{}

Solution

As is description: windows network share, I think it must be a SMB share.

Use Wireshark:

Files -> Dump Objects -> SMB to get your copy of Fahrenheit 451.

Copy the contents to a normal text editor and investigate.

You would find this:

2F4E7L3FC?0E9603@@<DPP`PN

This is an ROT47.

Script:

after = """!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~"""
origin = """PQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~!"#$%&\'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNO"""
ciper_text = "2F4E7L3FC?0E9603@@<DPP`PN"
decoded = ""
for char in ciper_text:
    decoded = decoded + after[origin.index(char)]
print(decoded)

Flag is auctf{burn_the_books!!1!}