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picoCTF 2021 Some Assembly Required 2

Last updated at Posted at 2021-03-31

できなかった問題をwriteup等を参考に勉強した記録を残す。

Some Assembly Required 2

1に続いて,またwasm
image.png
1でフラグがあった場所に暗号化したような文字列がある

xakgK\5cNs((j:l9<mimk?:k;9;8=8?=0?>jnn:j=lu

CyberChefのMagicに頼んでみる
image.png
0x08とxorして
picoCT=kF{ b2d14eaec72c31305075876bff2b5d}
=k とか { の後ろにスペースがある。

=k と { の後ろのスペースを除去して
picoCTF{b2d14eaec72c31305075876bff2b5d}を答えに突っ込んでみる
だめ

まんまの
picoCT=kF{ b2d14eaec72c31305075876bff2b5d}は?
だめ

=kだけ除去
picoCTF{ b2d14eaec72c31305075876bff2b5d}は?
正解
image.png

picoCT=kFとなったのが気になったのでpython2.7でやってみた
image.png
同じだ。

何でだろ?

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