write-ups-challenges-2022-2023/mom-what-are-we-eating-today/SOLUTION.md

How To Solve

1. The files 3pm.x84.2 and 3pm.y74.3- are 2 mp3 files that should be reversed (in name and in audio). This can be done by the following cmd for example: sox 3pm.x84.2 file2.84x.mp3 reverse

2. Now you will have 2 audio files that describe a huge number that you will need to convert in digits. You could use a speech to text convert like the Vosk-api to make the task easier. To Do so:

   • First convert the mp3 files into wav format: ffmpeg -i file2.84x.mp3 file2.84x.wav
   • Then install vosk via pip: pip3 install vosk
   • Then clone the vosk repo and download a english model:

       git clone https://github.com/alphacep/vosk-api
       cd vosk-api/python/example
       wget https://alphacephei.com/vosk/models/vosk-model-en-us-0.22.zip
       unzip vosk-model-en-us-0.22.zip
       mv vosk-model-en-us-0.22.zip model
       python3 ./test_simple.py test.wav > result.json
     

     Other models could be found here.
   • Now You will have a json file with the result that can be found in the json "text" blocks. The numbers should be correctly transcribed except for a few of the larger numbers. This ones will probably need to be manually corrected.
   • Once you can write a python script that convert large number words into numbers (use a list like this one for reference) or use a tool with the same capability on the internet (like this one).

3. After this you will have 2 large numbers of 50 digits. You will use this numbers to create a coordinate. This can be done by using the reversed file name. For example for the file 3pm.y74.3- it will be -3.47y.mp3. Which means a negative number with 3 digits before the decimal point, 48 digits after the decimal point and y means it's the y-coordinate.

4. if everything is done correctly you should get the coordinate: 43.568203645634485382241100258703131642483581332123, -116.77239845463438156511102435434249128141577257065

5. Plug this coordinate into google maps and you will end up on the "Chicken Dinner Rd". This you know we will eat a chicken dinner, creating the Flag IGCTF{ChickenDinnerRd}.

Flag

IGCTF{ChickenDinner}