PicoCTF - mus1c

tags: PicoCTF CTF General Skill

Source code

:::spoiler Lyrics

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Pico's a CTFFFFFFF my mind is waitin It's waitin Put my mind of Pico into This my flag is not found put This into my flag put my flag into Pico shout Pico shout Pico shout Pico My song's something put Pico into This Knock This down, down, down put This into CTF shout CTF my lyric is nothing Put This without my song into my lyric Knock my lyric down, down, down shout my lyric Put my lyric into This Put my song with This into my lyric Knock my lyric down shout my lyric Build my lyric up, up ,up shout my lyric shout Pico shout It Pico CTF is fun security is important Fun is fun Put security with fun into Pico CTF Build Fun up shout fun times Pico CTF put fun times Pico CTF into my song build it up shout it shout it build it up, up shout it shout Pico

:::

Recon

這一題挺詭異的，想了超級無敵久，完全就是只能看別人的WP[1]

Exploit - New Programming Language

1. 查詢歌詞的一些關鍵字會發現rockstar這個網站

   Rockstar is a computer programming language designed for creating programs that are also hair metal power ballads. 感覺上也和題目的歌詞有關係

2. 把歌詞貼到decoder會出現一堆數字，猜測應該是ascii code
3. Decode ascii and get flag: picoCTF{rrrocknrn0113r}

Reference

mus1c - Write up