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Cryptography serial CTF

A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.

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Security Fest 2023 Gothenburg Skyline Badge historical

challenge software

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.

Badge: Security Fest 2023 Gothenburg Skyline Badge
Type: challenge software
Status: historical
Compatibility: Security Fest 2023 Gothenburg Skyline Badge
Source: https://www.hackster.io/HacksFromPanda/the-gothenburg-skyline-badge-security-fest-eed557

Badge context

Related Resources

article mirror

Gothenburg Skyline Badge mirror

Readable mirror of the badge writeup, useful for text extraction and corroborating serial/CTF details.

Badge: Security Fest 2023 Gothenburg Skyline Badge

badge writeup

The Gothenburg Skyline Badge

Hackster project writeup for the Security Fest 2023 UV-printed Gothenburg Skyline badge.

Badge: Security Fest 2023 Gothenburg Skyline Badge

Source trail

Evidence Sources

Hackster.io · retrieved 2026-05-15

The Gothenburg Skyline Badge | Security Fest

Primary source for design story, hardware components, UV printing, soldering village, serial CTF behavior, and author credit.

Badge: Security Fest 2023 Gothenburg Skyline Badge

JPRalves mirror · retrieved 2026-05-15

The Gothenburg Skyline Badge | Security Fest

Corroborating readable copy of the Hackster project text.

Badge: Security Fest 2023 Gothenburg Skyline Badge