Cybdokey

CybdoKey

A RP2354 based usb hardware authentication key, or anything else you can write firmware for ;)

Cybdokey was made because yubikeys are too expensive and all the other options, including picofido on other devboards, were clunky. the user interaction button was tiny and hard to press, and depending on the board it was too big and/or needed an extra cable. Cybdokey was made to be a polished, compact FIDO key with capacative touch support.

Note: bom.csv is the LCSC parts list with working liks, whilst overall-bom.csv is an estimate of the overall project cost

Zine Page / Poster

pdf in assets/zine/Zine page.pdf

Features

• RP2354-based development board
• Stacked 2MB flash storage
• onboard USB-A connector
• Capacative touch pad with shine-through red and blue LEDs
• exposed 3V3, GND, RESET and BOOTSEL
• 2 keyring/accessory mount holes
• Hand-solderable (in theory)
• tiny form factor!

Usage

Simply plug Cybdokey into your computer's USB-A port, and it will function similar to a yubikey. Passkeys and OTPs can be stored on it, and it supports human presence detection using the capacative touch pad. LED signals are identical to that of any other pico-fido key.

Schematics

PCB

Firmware

See https://github.com/cybdo/cybdokey-fw for FIDO key firmware.

Firmware can be flashed on first boot, or by shorting the BOOTSEL jumper on the left side of the crystal, diagonally underneath the MCU, before booting.

CybdoKey is also compatiable with anything written for a RP2350/RP2354.

Credits and Acknowledgements

• KiCad
• Hack Club Fallout
• pcb2blender
• Blender
• MicroKey
• Pico FIDO, forked to make CybdoKey firmware