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Securinets Quals 2026

October 17, 2026 CTF Writeup ⏱ 1 min read
Securinets Quals 2026 Forensics Signal Processing SDR Memory Forensics Reverse Engineering Disk Forensics UEFI Cryptography

Walkthroughs for the challenges solved at Securinets Quals 2026.

Writeups in this collection

  1. 01 Silent Tone Three radio transmitters talk over each other on one 433 MHz channel. Read the protocol out of a USB log, repair a logic-analyser recording that silently dropped samples, decode the loud decoy, subtract it, and peel the two quiet transmitters apart to rebuild an encrypted flag. Hard Quals • SDR + Interference Cancellation ⏱ 35 min
  2. 02 dumppwn A Windows 11 memory dump caught one second after a kernel exploit ran. Convert the unusual RDMP dump format, spot a fake system process, read its XOR key out of the binary, and decrypt a secret straight out of physical memory, while ten AI-bait decoy flags try to pull you off course. Medium Quals • Memory Forensics + Reversing ⏱ 16 min
  3. 03 Gelatino A layered disk-forensics challenge: identify a replaced UEFI loader, reverse its custom byte decoder, turn the recovered shop records into a LUKS passphrase, and decrypt the final OpenSSL recipe. Hard Quals • UEFI Reversing + LUKS ⏱ 18 min

How to read the writeups

Each challenge starts with its points, files and description, followed by collapsed hints, what it targets, the walkthrough with commands and output, pitfalls and red herrings, and a collapsed flag.

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