[Cryptography] Design of a secure hardware dongle

[Ron Garret]

I’m working on a design for a minimalist secure hardware dongle.  The goal is to have it be usable as an HSM for the secure storage of secrets.  I have a prototype running on a Teensy3, but I’ve come to the conclusion that in order to really be secure there has to be some I/O on the dongle itself.  Hence, I am commissioning a new design that is essentially a Teensy3 with the addition of an OLED display and two push-buttons.  It will also have an on-board noise source for key generation.  The resulting device will be very similar to the Trezor, but not designed specifically for BitCoin.  I expect to be able to sell them for about $50.

If anyone here has an interest in such a device and would like to see a feature that I have not listed please let me know.

rg