We are given the following text file (originally - a single long line, split into several lines for clarity):
```7fffffffffffffffffffffffffffffffbffff0e10419dff07fdc3ffdaeab6deffdbfff6ffed7f7aef3febfffb7ff1bfbc675931e33c79fadfdebbae7aeddedb7dafef7dc37df7ef6dbed777beedbedb77b6de24718f260e0e71879fffffffffffffffffffffffffffffffffffffffffff07f87fc7f9ffffffffdbfbbfdbfeffffffffebfdffdfff7ffffff871c33e6fe7bffffffd5aefeed62dcffffffeadf9fb8bb0efffffff56df5db6dbf7ffffffaa0c21e19e3bffffe07ffffffffff9fffffffffffffffffffffffffffffffffffffff```
Converting it to a binary file and doing a ```file``` and ```binwalk``` on it brings no useful results. However it does look like it has some repeating patterns in it. Let's convert it into a binary string with the following script:
```pythonprint bin(int(open("msg.txt","r").read(),16))[2:].replace("0",".").replace("1","#")```
The script generates series of ```.```'s and ```#```'s. Let's copy the ouput into ```Notepad++```, reduce the font to a minimum (press ```Ctrl+-``` repeatedly), and resize the window continuously to see if we can spot something.
The following pattern is revealed:
![flag](https://0xd13a.github.io/ctfs/rctf2017/message/flag.png)
The flag is ```RCTF{ArEciBo_mEsSaGe}```.