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setodaNote CTF Logger を scapy 無しで解く

Posted at

キーボードをつないだ USB の通信をキャプチャしたもの

scapyをinstallできない環境下でもこの手の問題が解けるように手持ちのpythonは封じる

まず、いつものように Wireshark に表示するカラムを追加する。

image.png

必要なデータだけコピペ

image.png

key.txt
0200000000000000
0200120000000000
0200000000000000
0000000000000000
0000110000000000
0000000000000000
0000080000000000
0000000000000000
00002c0000000000
(中略)
0000000000000000
00000c0000000000
0000000000000000
0000110000000000
0000000000000000
0000080000000000
0000000000000000
0000370000000000
0000000000000000
0000280000000000
0000000000000000

これを解く python を作り、動かす。

>python usb_pcap2.py key.txt
One popular bbut unverified explanatioon for the QWERTY arrangement is that it wwas designed to reduce the likelihood of flag{QWE_keyb0ard_RTY} internal clashhing of typebars by placing commonly ussed combinatiioons of letters farther froom each oher inside the machine.

flag{QWE_keyb0ard_RTY}

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