Yubikeys are great. Many use them just for 2 factor authentication. But Yubikeys are capable to hold your GPG keys also. And you can use your GPG keys for SSH authentication. So here is the story of how I carry my SSH keys in my pocket all the time in (almost) pain-free and relatively secure way. You have two options for creating GPG keys: creating directly on Yubikey or creating on your computer and import to Yubikey.
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