solo-hw

I see your point too, and we're looking forward to a world in which low-power (to enable NFC) open source chips with security features exist. For instance, https://tropicsquare.com is a project that is working towards that. For now, what we mean by open source hardware is on the one hand that all components are freely available (without NDAs, which nearly all secure elements entail), and on the other that the schematic of the device is open source and passes OSHWA Certification (the CERN license https://ohwr.org/project/cernohl/wikis/Documents/CERN-OHL-ve... is relevant here). This means that you can in principle build a device yourself. The certification will be done post-campaign (we want to avoid copycat products appearing before ours is available in the open market). Like we did with our three previous keys (e.g., https://certificatio

This repo has 3 open boards based on STM32 to make your own security key: https://github.com/solokeys/solo-hw It could be useful to take inspiration and build your own, with a working example in mind. From a "process" perspective, check out this project: https://www.crowdsupply.com/sutajio-kosagi/fomu If you look at the things you can buy, they have a EVT board, which is I think what you're asking for. Usually you first build a larger version of the board to validate the design (and that you can start using to build the firmware), and then you shrink it.

For a mature, non-Google open source _and_ open hardware option: https://solokeys.com/ Software: https://github.com/solokeys/solo Hardware: https://github.com/solokeys/solo-hw

I've got a few SoloKey. This project seems like a joke comparatively as solo is actually open source hardware[0] and this is not. You can look above to see how OnlyKey might be more trouble on the software side than it's worth and potentially is just a liability. [0] https://github.com/solokeys/solo-hw