LIT CTF 2023 - Blank and Empty

Description

Category: Misc

This file seems blank, but it’s hiding some secrets. (Wrap the flag in LITCTF{})

blank.txt

Resolution

The file blank.txt isn’t really blank.

It containes invisible characters like:

• space ` `;
• newline \n;
• tab \t.

Thoses characters are used in the Whitespace programming language.

We use dcode.fr to decrypt it:

And we get the flag: LITCTF{h1d1ng_1n_pl41n_s1ght}.