Security Fest 2024 · Sweden · 2024

Security Fest 2024 Feskekôrka Piano Badge

Music-and-airship CTF building badge

A Security Fest 2024 badge shaped around Gothenburg's Feskekôrka fish-market landmark, with piano/touch-key gameplay, an airship story CTF, LEDs, USB-C serial interaction, and documented attendee/speaker/crew variants.

Security Fest Sweden Nuvoton CH340 USB-C CTF Piano Touch Serial LEDs Speaker

EventSecurity Fest 2024

SeriesSecurity Fest

LocationGothenburg

CountrySweden

People

Authors & Credits

badge author and project designer

Abhinav SP

Listed as a project author on the Hackster.io Feskekôrka Piano Badge writeup.

Source

badge co-author, music and challenge design

Lars Haulin

Listed as co-author; the writeup says Lars contributed music, embedded systems, cyber-security challenge work, keyboard experiments, and instruments.

Source

Why It Mattered

Security Fest adds a Swedish badge lineage where the badge is not just a token: it combines local architecture, music, serial text adventure interaction, CTF progression, production drama, and public build documentation.

Hardware

The Hackster bill of materials documents an MS51FB9AE Nuvoton microcontroller, CH340G USB-to-serial UART, USB-C connector, 13 SMD LEDs, 1206 passives, 12 MHz crystal, CR2032 holder, slide switch, and 35 mm mini speaker.

Software & Apps

The badge presents a serial interface at 115200 baud with NL and CR, touch-key navigation, piano mode, a function-key airship, storyline CTF progression, memory/action/morse games, and harder cryptography, reverse-engineering, and memory-corruption challenges.

Lore

The design turned the Feskekôrka landmark into Disco-körka, with windows and doors acting as seven keyboard keys and an airship carrying the CTF story from Security Fest's old venue toward the new one.

Lifecycle

Add-ons & Upgrades

audio add-on documented solder option

Mini speaker piano mode

Hackerware documents sticking a mini speaker on the backside and soldering its leads at LS1 to play the piano.

Compatibility: Security Fest 2024 Feskekôrka Piano Badge

Source

challenge software historical

Airship storyline CTF

The badge CTF is framed as an airship journey with touch-key and serial navigation, games, riddles, and harder crypto, reverse-engineering, and memory-corruption challenges.

Compatibility: Security Fest 2024 Feskekôrka Piano Badge

Source

hardware challenge mod documented solder option

Airship LED unlock path

Hackerware documents replacing C1 and C2 with 22 pF capacitors, then adding SMD LEDs and resistors at D9-D13 and R8-R12 to play the CTF and unlock airship lights.

Compatibility: Security Fest 2024 Feskekôrka Piano Badge

Source

Operational history

Issues & Camp Impact

assembly production caveat note

Assembly was disrupted when the reflow oven conveyor stopped working; the team externally drove the conveyor motor and tuned the supply around 8.5 to 9 volts to keep production moving.

The record captures the real operational work behind the polished attendee artifact and preserves a useful production failure mode for future badge teams.

Confidence: primary writeup
Status: historical
Timeframe: pre-conference production
Source note: Hackster.io Feskekôrka Piano Badge writeup.

missing rights-cleared image note

No Security Fest 2024 Feskekôrka Piano Badge image is published because the current public source trail has not been paired with a reusable original badge or artifact photo or official upstream raster render with source URL, license or permission basis, attribution, and processing notes.

The Sweden record remains source-backed and image-free rather than copying source-page media, documentation screenshots, event photos, social media, placeholders, or generated approximations.

Confidence: local project policy
Status: needs licensed original replacement
Timeframe: current catalogue build
Source note: badge.gallery image policy and Security Fest 2024 badge source trail.

post-assembly challenge soldering note

The CTF LED path required desoldering capacitors C1 and C2, replacing them with 22 pF capacitors, and soldering SMD LEDs and resistors at specific locations.

The badge intentionally blurs software play with hands-on hardware rework; the compendium tracks that as a lifecycle/challenge caveat.

Confidence: badge guide
Status: historical
Timeframe: badge hacking workflow
Source note: Hackerware Security Fest Piano CTF Badge guide.

Resources

Security Fest event site · Current public Security Fest site for conference-lineage context. Security Fest CTFtime profile ctf context · CTFtime profile for Security Fest; may require anti-abuse access controls. Security Fest Piano CTF Badge badge guide · Hackerware guide for LED placement, CTF unlock solder steps, serial monitor settings, and mini-speaker solder points. The Feskekôrka Piano Badge badge writeup · Hackster project writeup with story, bill of materials, assembly notes, serial menu, CTF design, photos, and credits.

Sources

Hackerware: The Security Fest Piano CTF Badge Retrieved 2026-05-15 · Primary source for serial monitor settings, speaker solder points, and CTF LED/solder instructions. Hackster.io: The Feskekôrka Piano Badge | Security Fest Retrieved 2026-05-15 · Primary source for badge story, BOM, hardware, serial interface, CTF, production caveat, photos, and authors.