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防衛省サイバーコンテスト2023 Programming Mimic Unicode

Posted at

他の方の Write Up 読んでもよくわからなかったので、自分でもやってみる。
最初 Take Byte しつつ、AND, XOR などビット演算いろいろやってみていたけど、そこまで必要なかった。

Charcode をビット列とみなせばよかったようだ。

Charcode に変換してそれぞれ、1、0 に変換してbinary を character に

https://gchq.github.io/CyberChef/#recipe=To_Charcode('Space',16)Find_/_Replace(%7B'option':'Simple%20string','string':'30b4'%7D,'0',true,false,true,false)Find_/_Replace(%7B'option':'Simple%20string','string':'30b3%203099'%7D,'1',true,false,true,false)Find_/_Replace(%7B'option':'Simple%20string','string':'%20'%7D,'',true,false,true,false)From_Binary('Space',8)

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