GPNCTF

Writeups for GPNCTF challenges.

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Scanwich Station

Challenge by vurlo

A table-side QR reader for hungry guests and suspicious menus. One special order can make the scanner serve more than dinner.

2026-06-05 14 min read 5 solves / 405 points

Smile at me

Challenge by vurlo

Be careful, others might be able to find out your most sacred secrets! (Flag only consists of emojis surrounded by 'GPNCTF{...}') The remote instance is not deployed via Docker-compose but plain Docker, resulting in the bot URL to be 'localhost:3000' instead of 'bot_service:3000' and the challenge server being 'localhost:9222' instead of 'challenge_service:9222'.

2025-08-21 11 min read 1 solve / 500 points