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I made one of these a while ago in school, it was fun! I think it's a great idea. Mine really had nothing: an overly complicated MCU, since it was provided by the class, but otherwise no need for an OS or anything: https://benkettle.xyz/projects/password-keeper/

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Nice. My wishlist also includes something similar looking with Luckfox Pico Mini + small OLED for displaying info about requests (via USB), to authorize various crypto operations with secret material stored on the device. :)

Check out Precursor (FPGA device with softcore CPU running on it for trustability).

Xous (microkernel OS for Precursor) has an application called Vault that does FIDO2/U2F as well as password management and USB HID emulation.

https://www.crowdsupply.com/sutajio-kosagi/precursor/updates...

Much more on the dev board side and probably overkill for just this purpose but a really cool device.

Yeah, very cool!

Interestingly, Pinephone is in the almost good intersection of hackable and portable: :)

https://www.crowdsupply.com/sutajio-kosagi/precursor

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