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ksnctf q5 Onion

Posted at

http://ksnctf.sweetduet.info/problem/5
なんか文字列がある。

やったこと(ネタバレ)

何も考えずにOnion encryptionあたりでググるがそれっぽい奴は出てこない。
アルファベット+数値だけなのでBase64でデコードしてみると、ほとんど何も変わらない文字列が出力される。
つまり、Base64で何度もデコードできるっぽいんでプログラミを書いてやったら、begin 666 という謎の文字列が出てくる。
適当にぐぐったら、なんかのエンコードっぽいんでuudecodeでデコードして終わり。

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