The `challenge.txt` file contains:

`.... .... .. ... . ..... ... ..... .... .. .. .... .... ... ... .... ... ... . ..... .... .. .. .... .... ... .... .... .... .. ..... .... .. .... ... ... .. .. .... .... ... .... . ..... .... ... . ... . . ... ..... . ..... .. . .... .. ... .... ... .. .. ... .. .... .... ... . ... . ..... ... . ... .`

They are [tap codes](https://en.wikipedia.org/wiki/Tap_code).

Let's try decoding them!


We get the *original text* `theprisoneristryingtoescapefromhiscell`.

As the *description* said, we have to make the letters of that text *uppercase* and *wrap* it with **TMUCTF{}**.

So, the flag will be `TMUCTF{THEPRISONERISTRYINGTOESCAPEFROMHISCELL}`.

Original writeup (https://github.com/MikelAcker/CTF_WRITEUPS_2021/blob/main/TMUCTF_2021_Writeup/Misc/Prison/README.md).