Off-By-One
The June 26-27, 2024 first Off-By-One Singapore offensive-security conference whose source-backed Octopus hardware badge carried dual screens, ESP32-S3 and ATmega328P controllers, MicroPython challenge apps, and a six-flag badge challenge.
M Hotel Singapore · Singapore · 2024
Off-By-One Conference 2024 used an Octopus-themed hardware badge with ESP32-S3 and ATmega328P controllers, dual 128x128 GC9A01 round LCDs, IR, WS2812 LEDs, buttons, a user-flashable MicroPython challenge surface, and six published challenge flags.
Lifecycle
The documented hardware includes IR transmitter/receiver and an SAO connector alongside the main badge controls and lights.
The writeup documents USB file access, Python files, and six challenge flags across web, BLE, roulette, file, and inter-controller puzzle surfaces.
The badge carried two 128x128 GC9A01 circular LCDs, buttons, WS2812 LEDs, USB-C, and a visible Octopus board shape.
The attendee writeup identifies an ESP32-S3 running Arduino and an ATmega328P running MicroPython, with the two controllers talking over I2C.
Operational history
The catalogue uses the writeup to prove challenge behavior while avoiding full challenge-solution reproduction in the badge summary.
Hardware and software fields stay limited to the attendee writeup, licensed photos, and public event context.
The Singapore record can show a real badge photo with source URL, license, attribution, preserved local source original, and optimized WebP delivery rather than generated or unclear imagery.
