It's possible to generate a key on a regular computer and transfer it to a YubiKey if you prefer. (It's not like software key generation has been flawless either; [OpenSSL/Debian fiasco]. Oh well, such is life).
Even if you're not going to put your SSH keys on a YubiKey, I _strongly_ encourage folks to get a Security Key (aka U2F device), of which YubiKeys are one brand, and use it for 2FA with Google/Github/Facebook/etc. In addition to (IMO) being more usable than Google Authenticator, Security Keys are resistant to phishing, which is a huge win.
Alex
On Mon, Dec 11, 2017 at 7:57 AM, Stefan Krah stefan@bytereef.org wrote:
On Mon, Dec 11, 2017 at 01:47:50PM +0100, Victor Stinner wrote:
2017-12-11 13:29 GMT+01:00 Stefan Krah stefan@bytereef.org:
Ssh isn't available everywhere, I don't want to install an app or give out my phone number to half of Silicon Valley [1].
SMS and FreeOTP are just a few options that you have to generate/get OTP.
I suggest to use Yubikey. It doesn't need to install an app or to give your phone number, but it costs 50$. The advantage is that you can use it to store your SSH and GPG keys.
I'm not a fan of hardware key generation. :-)
https://en.wikipedia.org/wiki/YubiKey
"In October 2017, security researchers found a vulnerability (known as ROCA) in the implementation of RSA keypair generation in a cryptographic library used by a large number of Infineon security chips. The vulnerability allows an attacker to reconstruct the private key by using the public key.[18][19] All YubiKey 4, YubiKey 4C, and YubiKey 4 nano within the revisions 4.2.6 to 4.3.4 are affected by this vulnerability.[20] Yubico publicized a tool to check if a Yubikey is affected and replaces affected tokens for free.[21]"
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