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Sanity check: Yubikeys and password shares (reddthat.com)

submitted 2 weeks ago by Telorand@reddthat.com to c/cybersecurity@sh.itjust.works

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I've been thinking about getting a couple of Yubikeys for a partner and myself, but we share certain accounts. While I would love to have the Yubikey 5 that can store TOTP, that seems like it could be problematic for shared accounts.

Would using the cheaper Yubico Security Keys to unlock Bitwarden Premium vaults, that use a Shared Organization, be a better/more sane option than trying to sync up TOTP secrets every time a new shared account gets added? Any other critiques or suggestions?

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[–] MostlyBlindGamer@rblind.com 3 points 2 weeks ago (8 children)

All it takes to sync TOTP is to manually set up the secrets on all keys.

Keeping a second factor in a password manager makes it a single factor, doesn’t it?

[–] Telorand@reddthat.com 2 points 2 weeks ago (5 children)

So let's say I'm at work, I set up NewAccount to use Yubikey A. Partner has Yubikey B and isn't nearby. How would I share or retrieve that secret key later? My understanding is that's not possible if it's stored on the key, but maybe I'm wrong.

[–] girsaysdoom@sh.itjust.works 2 points 2 weeks ago (2 children)

If you're just storing the password on the key then, no you can't get it unless you have the key. The main usage (arguably) for a yubikey is the FIDO2 auth method where you add those keys as MFA methods. That would allow access using either key.

[–] MostlyBlindGamer@rblind.com 1 points 2 weeks ago

I think of that like putting multiple things in the same basket, but putting two locks on that basket.

[–] Telorand@reddthat.com 1 points 2 weeks ago

Thanks, that's kind of what I was thinking.

Sounds like a YK5 might still be a viable use case, but I'd have to do a deeper analysis of what account 2FA secrets would need to be shared versus which can be relegated onto individual keys and safely lose that "always accessible anywhere" trait.

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