Somu: A tiny FIDO2 security key for two-factor authentication and passwordless

Опубликовано: 29 Март 2026
на канале: Tech5
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Somu is a tiny FIDO2 security key you can use with your Google, Twitter, and GitHub accounts for two-factor authentication, or your Microsoft account for passwordless login. Somu fits in your USB port, so you’ll never forget your key again.
Somu is the micro version of Solo. We were inspired to make a secure Tomu, so we took its tiny form factor, we added the secure microcontroller and firmware of Solo, et voilà! Here we have Somu.
Stretch Goals
$35k - campaign goal - we'll start manufacturing as soon as we reach this goal, so hurry up and back Somu! If you're undecided just go ahead and pick a pledge, you can always change it later.
$50k - tie die case - we'll cheer to a special campaign and make limited edition, unique cases for each Somu.
$100k - SSH/GPG - we'll invest part of the funding to speed up the implementation of SSH/GPG support, starting with ECDSA keys.
$150k - Ed25519 - we'll continue investing in our features set by supporting Ed25519 in both FIDO2 and SSH/GPG, that should provide better speed and security.

Open Source: Verified and TrustworthySomu and all our other keys share open source hardware and firmware, because we believe that security should be more open, especially when it comes to hardware. Our keys are verified, trustworthy and hide no secrets. Well, except one: a master secret is safely stored and protected by the STM32 microcontroller, so that only you can log in, of course.
A note on security: in this campaign, we’re only selling Somu Hacker, the reprogrammable version of Somu. Please read the details in the section "Somu Hacker and Security" below.














Hand soldered prototype.


FIDO2: Strongest Web AuthenticationLike many other FIDO2 security keys on the market, Somu works seamlessly with your Google, Twitter, and GitHub accounts for two-factor authentication, or with your Microsoft account for passwordless login. Somu fits in your USB port, so you’ll never forget your key again. And FIDO2 / WebAuthn is now a web standard, so you don’t need any extension whatsoever, Somu just works on most operating systems and browsers.
Unlike many other FIDO2 security keys on the market, Somu is fully open source and reprogrammable. It has an STM32L4, one RGB led, and two buttons. It’s secure against online attacks and can be permanently locked down to be secure against physical attacks (more on firmware security below).
SSH (Stretch Goal): Hardware-backed AuthenticationDuring this campaign, we’ll be building the much-awaited support for SSH/GPG. We plan to add ECDSA keys first, followed by Ed25519. RSA is still a question mark because of the size of the keys, but of course the design will be modular enough to support everything eventually.
Development is already in progress, but the space is pretty fragmented with many lacking features from other tools (for example, ssh-agent/opensc l

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