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picoCTF 2024 wirteup WebDecode

Posted at

WebDecode (Web Exploitation)

Do you know how to use the web inspector?
Start searching here to find the flag

記載のリンク先に遷移する。
web inspector を使ってフラグを探せば良いらしい。
web inspectorはCtrl+Shift+Cで開ける。
HOME画面に謎文字列は見つからなかった。
ABOUT画面に遷移すると、"Try inspecting the page!! You might find it there"というメッセージが表示された。
bodyのsectionのところに謎文字列を発見。
image.png
おそらくcGljb0NURnt3ZWJfc3VjYzNzc2Z1bGx5X2QzYzBkZWRfZjZmNmI3OGF9はBase64であると推測できる。
CyberChefを使ってBase64 Decodeを行う。

フラグが得られた。
picoCTF{web_succ3ssfully_d3c0ded_f6f6b78a}

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