Figuring out GPG, SSH and U2F with YubiKey 4

You know your wife is a keeper when she gets you a YubiKey 4 for your birthday! I was really excited about this YubiKey because of its support for storing your GPG private keys and also for an SSH private key, in addition to the U2F (Universal 2nd Factor) support. I've been using earlier versions of the YubiKey for OTP (one-time password) and U2F, but the new version was especially interesting to me because of ...

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