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picoCTF 2024 writeup interencdec

Posted at

interencdec (Cryptography)

Can you get the real meaning from this file.
Download the file here.

添付ファイル
・enc_flag

enc_flagをメモ帳で開くと、以下の謎文字列が出てきた。
YidkM0JxZGtwQlRYdHFhR3g2YUhsZmF6TnFlVGwzWVROclgyZzBOMm8yYXpZNWZRPT0nCg==
これをcyberchefでbase64 decodeする。
謎文字列b'd3BqdkpBTXtqaGx6aHlfazNqeTl3YTNrX2g0N2o2azY5fQ=='が出力された。
'で囲まれた部分を取り出して。もう一度base64 decodeする。
謎文字列wpjvJAM{jhlzhy_k3jy9wa3k_h47j6k69}が出力された。
rot19する。
フラグが得られた。
picoCTF{caesar_d3cr9pt3d_a47c6d69}

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