Spellbrewery

Personal Rating: Easy

I used ChatGPT for creating a first draft of the decoder script to save time.

We have a dll file that we have to analyze. The program that comes with it seems to be a game where you have to enter the correct ingredients for a potion.

  • Opening the dll file in ILSpy, I could immediately see the correct ingredients and how they are processed. I will try to write a Python decoder:

  • The decoder is based on the information I gained from ILSpy, but I must admit I used ChatGPT to create the script. I learned that you can create an indexmap to do a string search on an array in Python, which is super useful.

import os

list1 = open("allflags.txt","r")
list2 = open("correctflags.txt","r")

indexmap = {item: index for index, item in enumerate(list1)}

result = []

for string in list2:
    if string in indexmap:
        index = indexmap[string] + 32
        result.append(chr(index))

concatenatedresult = ''.join(result)
print(concatenatedresult)

HTB{y0ur3_4_tru3_p0t10n_m45st3r_n0w}

Flag Decoder:

For Reference:

Correct Ingredients:

All Ingredients:

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