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picoCTF 2019 Tapping - Points: 200

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問題

image.png

解いてみた

ncを使ってアクセスしてみます。

image.png

変なのが表示された後、入力を求められてる感があったので、「aaa」と打ってみたら終了しました。
雰囲気的にモールス信号でしょうか?
しかも英語版で。

Morse Code - Rumkin.com
http://rumkin.com/tools/cipher/morse.php

ここに一覧が載ってたので、それぞれ対応させてみます。

image.png

全部大文字で対応させたものが正解でした。

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