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SekaiCTF 2022 Writeup - Matryoshka | siraben’s musings
https://siraben.dev/2022/10/02/matryoshka.html
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ANSI escape codes. Race conditions in PNG parsing. Digital COVID-19 vaccination records. De-noising audio files and the NATO phonetic alphabet. The only thing linking all of them? A race to solve a CTF challenge and get the flag.