Martin Rozariyo

Writeups

Security notes and CTF writeups

Markdown writeups discovered at build time from CTF_Writeups/2026 and L3m0nCTF2025-Writeups, then rendered from raw GitHub markdown into static pages.

CTF_Writeups/2026/0xfun/Forensics/DTMF/Writeup.md

DTMF - Writeup

DTMF Writeup <img width="522" height="698" alt="image" src="https://github.com/user attachments/assets/4d524f2c 8acd 4d08 ae3c 4242e9bcff20" / Step 1 — Extract DTMF Tones DTMF t...

CTF_Writeups/2026/0xfun/Forensics/Ghost/Writeup.md

Ghost - Writeup

Ghost Writeup <img width="521" height="482" alt="image" src="https://github.com/user attachments/assets/8c2d3009 f43c 4a00 a53f 8c45c4ad6d7e" / “The truth is in the static.” A l...

CTF_Writeups/2026/0xfun/Forensics/kd>/Writeup.md

kd> - Writeup

kd Writeup <img width="499" height="430" alt="image" src="https://github.com/user attachments/assets/0160bda5 315a 4b94 9ffb 62fba24c7300" / Step 1 Initial Analysis First I unzi...

CTF_Writeups/2026/0xfun/Forensics/NothingExpected/Writeup.md

Nothing Expected - Writeup

Nothing Expected Writeup <img width="514" height="450" alt="image" src="https://github.com/user attachments/assets/e9a929c1 2ee1 4d21 b257 c206a6a842eb" / The challenge name “No...

CTF_Writeups/2026/0xfun/Forensics/Tesla/writeup.md

Tesla CTF - Writeup

Tesla CTF Writeup Challenge Overview The challenge provided a file named Tesla.sub (originally thought to be data.bin by the user, but identified as Tesla.sub). This file mimics...

CTF_Writeups/2026/0xfun/Hardware/DigitalTransition/writeup.md

Digital Transition - Writeup

Digital Transition Writeup Challenge Description We were given a raw signal capture from an HDMI display adapter: signal.bin. The hint mentioned it contained a single digitized...

CTF_Writeups/2026/KICTF/Forensics/Childhood-Photo/Writeup.md

Childhood Photo

Childhood Photo When I first looked at the challenge, there was only one file: gepj.lanif The filename immediately felt suspicious. If you reverse it, it becomes final.jpeg. Tha...

CTF_Writeups/2026/KICTF/Forensics/dead/Writeup.md

Dead Frequency

Dead Frequency Category: Forensics Flag: KICTF{t1m1ng is 3v3ryth1ng and dns n3v3r li3s} Our IDS flagged unusual ping activity from an internal workstation to an external IP. We...

CTF_Writeups/2026/KICTF/Forensics/HeartBeat/Writeup.md

Heart Beat - Forensics CTF Writeup

Heart Beat Forensics CTF Writeup Challenge Description An anonymous source leaked this strange animation. It plays. It loops. It looks normal. The first thing you see is never t...

CTF_Writeups/2026/KICTF/Misc/Catch-the-wind/Writeup.md

Catch the Wind

Catch the Wind Category: Forensics Flag: KICTF{0FF 7h3 r4d4r n0w} The attacker claims they bypassed perimeter security and left a “parting gift” in an outbound broadcast. They c...

L3m0nCTF2025-Writeups/Cryptography/InternalNotation/Readme.md

Challenge Overview: Internal Notation

Challenge Overview: Internal Notation Category: Cryptography Event: L3m0nCTF 2025 Role: Challenge Author 🛠️ Author Note This challenge was authored by me for L3m0nCTF 2025 . Th...

L3m0nCTF2025-Writeups/Cryptography/RotatingShadows/Readme.md

Challenge Overview: Rotating Shadows

Challenge Overview: Rotating Shadows Category: Cryptography Event: L3m0nCTF 2025 Role: Challenge Author 🛠️ Author Note This challenge was authored by me for L3m0nCTF 2025 . The...

L3m0nCTF2025-Writeups/Forensics/LastCall/Readme.md

Challenge Overview: Mystery Call

Challenge Overview: Mystery Call Category: Forensics Event: L3m0nCTF 2025 Role: Challenge Author 🛠️ Author Note This challenge was authored by me for L3m0nCTF 2025 . The follow...

L3m0nCTF2025-Writeups/Forensics/LayersOfTrust/Readme.md

Challenge Overview: Layers of Trust

Challenge Overview: Layers of Trust Category: Forensics / Cryptography Event: L3m0nCTF 2025 Role: Challenge Author Category: Forensics / Crypto 🛠️ Author Note This challenge wa...

L3m0nCTF2025-Writeups/Forensics/LostSignal/Readme.md

Challenge Overview: Lost Signal

Challenge Overview: Lost Signal Category: Forensics Event: L3m0nCTF 2025 Role: Challenge Author 🛠️ Author Note This challenge was authored by me for L3m0nCTF 2025 . The followi...

L3m0nCTF2025-Writeups/Forensics/NowhereOnTheRoad/Readme.md

Challenge Overview: Nowhere on the Road

Challenge Overview: Nowhere on the Road Category: Forensics / Steganography Event: L3m0nCTF 2025 Role: Challenge Author 🛠️ Author Note This challenge was authored by me for L3m...

L3m0nCTF2025-Writeups/Forensics/TheCicadaArchives/Readme.md

Challenge Overview: The Cicada Archives

Challenge Overview: The Cicada Archives Category: Forensics Event: L3m0nCTF 2025 Role: Challenge Author 🛠️ Author Note This challenge was authored by me for L3m0nCTF 2025 . The...

L3m0nCTF2025-Writeups/OSINT/Hotel Bagavathi/Readme.md

Challenge Overview: Hotel Bagavathi

Challenge Overview: Hotel Bagavathi Category: OSINT Event: L3m0nCTF 2025 Role: Challenge Author Authors: R0z4riy0 & akvnn 🛠️ Author Note This challenge was authored by us for L...