Security Fest 2018 Challenge Badge
A simple Security Fest 2018 challenge badge with USB-A, two buttons, four DIP switches, red/green LEDs, HID text output, serial puzzle flow, and an open SecBadge hardware repository.
Country dossier
Sweden
Worldwide badge coverage for Sweden, grouped into seeded badges, event editions, add-ons, operational issues, resources, and evidence sources.
Seeded artifacts
Badges
Security Fest 2022 Tram Badge
A conservative first-pass record for Security Fest's 2022 tram-inspired badge, remembered in later badge writeups as a fun blinky object inspired by Gothenburg trams with a Rickroll reference.
Security Fest 2023 Gothenburg Skyline Badge
A full-colour UV-printed Security Fest badge inspired by Gothenburg's skyline with a cyberpunk treatment, backside-mounted components, Micro-USB CTF interface, cryptography puzzles, and soldering-village LED personalization.
Security Fest 2024 Feskekôrka Piano 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.
Events
Camp and Event Editions
Security Fest 2018
The Swedish Security Fest edition with a simple but public challenge badge built around USB HID, serial output, DIP-switch paths, and an open SecBadge hardware repository.
Security Fest 2022
The Swedish Security Fest edition with a publicly remembered tram-inspired badge that blinked lights and included a Rickroll reference.
Security Fest 2023
The Swedish Security Fest edition with a UV-printed Gothenburg Skyline CTF badge, soldering-village LED personalization, and serial cryptography challenges.
Security Fest 2024
The Swedish Security Fest edition with the Feskekôrka Piano Badge, a music-and-airship CTF badge documented through Hackster and Hackerware build notes.
Lifecycle
Add-ons & Upgrades
Security Fest 2024 Feskekôrka Piano Badge
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.
Security Fest 2022 Tram Badge
historical
Rickroll lore
The same retrospective source preserves the badge's Rickroll reference as part of its social memory.
Security Fest 2022 Tram Badge
historical
Blinky tram motif
The later writeup remembers the 2022 badge as a fun blinky badge inspired by Gothenburg trams.
Security Fest 2018 Challenge Badge
historical
DIP-switch clue paths
The writeup documents multiple clue texts triggered by toggling DIP switches and pressing a badge button, turning a small hardware input surface into the puzzle selector.
Security Fest 2024 Feskekôrka Piano Badge
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.
Security Fest 2023 Gothenburg Skyline Badge
historical
Cryptography serial CTF
The badge CTF uses a serial monitor at 9600 baud; sending three stars enters CTF mode and solving eight cryptography puzzles unlocks eight building lights.
Security Fest 2018 Challenge Badge
historical
HID and serial puzzle flow
The badge presents itself as both HID and serial; HID button output gives onboarding and clues, while listening on the serial interface reveals the path into the PGP/key-recovery challenge.
Security Fest 2024 Feskekôrka Piano Badge
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.
Security Fest 2023 Gothenburg Skyline Badge
historical
Soldering-village LED personalization
Security Fest hosted a soldering village so attendees could solder their own LEDs in chosen colours and personalize the badge.
Operational history
Issues & Camp Impact
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.
The quoted badge text says the board is loaded with an Arduino Leonardo bootloader and can be treated as an Arduino clone, but warns that getting everything to work and fit can be finicky.
The compendium records this as a practical attendee caveat rather than an unresolved defect: the badge was intentionally open and modifiable, but not frictionless.
The badge's full visual payoff depended on attendees soldering their own LED colors in the conference soldering village.
This is a useful lifecycle record: the badge was partly a shipped object and partly an on-site hardware workshop artifact.
No documentary photo of the original 2022 artifact has been cleared for public reuse.
The source-backed facts remain useful while the catalogue withholds imagery until licensed original photos are curated.
No Security Fest 2018 Challenge 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.
No Security Fest 2023 Gothenburg Skyline 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.
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.
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.
The current public source set found for this pass describes the badge through later Security Fest badge retrospectives rather than a standalone 2022 build page.
The dossier keeps the 2022 badge discoverable while avoiding chip-level, firmware, app, production, or author claims until primary sources are recovered.
The current build has not cleared a reusable original badge photo from the field writeup or repository.
The record remains source-backed for facts, while the catalogue withholds imagery until a licensed original photo is curated.
Resources
Gothenburg Skyline Badge mirror
article mirror · Readable mirror of the badge writeup, useful for text extraction and corroborating serial/CTF details.
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.
The Gothenburg Skyline Badge
badge writeup · Hackster project writeup for the Security Fest 2023 UV-printed Gothenburg Skyline badge.
SecBadge BOM
bill of materials · BOM listing the 69x43 mm board's ATmega32U4, USB-A connector, four-position DIP switch, two tactile switches, red/green LEDs, crystal, passives, and ISP header.
Security Fest CTFtime profile
ctf context · CTFtime profile for Security Fest; may require anti-abuse access controls.
Security Fest
event site · Current public Security Fest site for Swedish conference-lineage context.
Security Fest
event site · Current public Security Fest site for conference-lineage context.
Security Fest 2018 challenge badge writeup
field writeup · Zeta-Two field report documenting the challenge badge, HID/serial behavior, DIP-switch clue paths, prize flow, and community attribution.
Feskekôrka Piano Badge retrospective
retrospective badge writeup · Later Security Fest badge writeup that helps place the 2022 tram badge in the same Gothenburg-landmark badge lineage.
Gothenburg Skyline Badge retrospective
retrospective badge writeup · Later Security Fest badge writeup mentioning the previous year's fun blinky badge inspired by Gothenburg trams and Rickroll.
SecBadge repository
source · Public hardware repository with board files, schematic/layout assets, firmware directory, and Gerbers for the challenge badge.
Sources
GitHub / znibb: SecBadge
Retrieved 2026-05-15 · Primary open-hardware source for board dimensions, design files, Gerbers, firmware directory, and component evidence.
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 · Supporting source for Security Fest's continuing Gothenburg landmark badge design lineage.
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.
Hackster.io: The Gothenburg Skyline Badge | Security Fest
Retrieved 2026-05-15 · Retrospective source for the 2022 tram-inspired blinky badge and Rickroll lore.
Hackster.io: The Gothenburg Skyline Badge | Security Fest
Retrieved 2026-05-15 · Primary source for design story, hardware components, UV printing, soldering village, serial CTF behavior, and author credit.
JPRalves mirror: The Gothenburg Skyline Badge | Security Fest
Retrieved 2026-05-15 · Corroborating readable copy of the Hackster project text.
Zeta-Two: Security Fest 2018 Challenge Badge & Prize Assembly
Retrieved 2026-05-15 · Primary field source for challenge behavior, HID/serial lore, clue flow, prize context, Weckzen attribution, and Zkylark Electronics thanks.