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grep , sed , tr, ROT13

Last updated at Posted at 2023-11-15

[picoCTF][Cryptography][credstuff]

Writeup

  • grepで指定のユーザ名を検索した。
    grep -n cultiris usernames.txt
    screenshot 11.png

  • sedで指定の行数の文字列を表示した。
    sed -n 378p passwords.txt
    screenshot 12.png

  • ROTっぽい文字列が出たので、Bashで解いてみた。
    sed -n 378p passwords.txt | tr 'A-Za-z' 'N-ZA-Mn-za-m'
    ROT13で当たりでした。
    screenshot 13.png
sed -n 378p passwords.txt | tr 'A-Za-z' 'N-ZA-Mn-za-m'
  • 以上です。
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