Zero-Width Space (ZWSP) Stegonography


We found this text classified as "Top secret". But we found an ordinary placeholder there. What is the secret?


Opening up the file in a hex editor, we can see that there are many zero-width characters hidden in the spaces. This is zero-width steganography, and each of the zero-width characters contain encoded data.

Luckily for us, there is a site that implements the decoding for us. We only need to paste the encoded text.

The flag is YauzaCTF{1_c4n_h1d3_wh473v3r_y0u_w4n7_3v3rywh3r3}.

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