Feeling the cost of commercial options like the YubiKey and Nitrokey were too high, [TheStaticTurtle] started researching DIY alternatives. He found an open source project allows the STM32F103 to act as a USB cryptographic token for GNU Privacy Guard, which was a start. All he had to do was build a suitable device to install it on.
See how at STM32 Blue Pill Turned GPG Security Token
Feeling the cost of commercial options like the YubiKey and Nitrokey were too high, [TheStaticTurtle] started researching DIY alternatives. He found an open source project allows the STM32F103 to a…