> For the complete documentation index, see [llms.txt](https://picoctf2022.haydenhousen.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://picoctf2022.haydenhousen.com/cryptography/basic-mod2.md).

# basic-mod2

## Challenge

A new modular challenge! Download the message [here](https://artifacts.picoctf.net/c/499/message.txt). Take each number mod 41 and find the modular inverse for the result. Then map to the following character set: 1-26 are the alphabet, 27-36 are the decimal digits, and 37 is an underscore. Wrap your decrypted message in the picoCTF flag format (i.e. `picoCTF{decrypted_message}`)

## Solution

Run the solution [script.py](https://github.com/HHousen/PicoCTF-2022/blob/master/Cryptography/basic-mod2/script.py), which directly applies the operations as per the challenge description.

### Flag

`picoCTF{1NV3R53LY_H4RD_C680BDC1}`