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CTF write-ups

Plain-HTML copies of the write-ups. The portfolio has an interactive reader for the same content.

KubSTU CTF 2026 Autumn

AES Is Secure, Right?crypto · 107 pts · AES-128 is never attacked: the key is a 4-digit PIN with one digit leaked, so 1000 candidates are enough once the home-made block shuffle is undone.

Securinets CTF Qualifications 2026

Gelatinohardware · 441 pts · Custom EFI loader, two decoys, LUKS2 vault. Old Calculatorcrypto · 436 pts · Float constants turn a tiny calculator into a division engine: Newton's iteration recovers a secret affine map from a single reveal per round.