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Jason Stelzer 2020-05-04 08:28:23 -04:00
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@ -2330,7 +2330,7 @@ Admin PIN: 12345678
1. Programming YubiKey for GPG keys still lets you use its other configurations - [U2F](https://en.wikipedia.org/wiki/Universal_2nd_Factor), [OTP](https://www.yubico.com/faq/what-is-a-one-time-password-otp/) and [static password](https://www.yubico.com/products/services-software/personalization-tools/static-password/) modes, for example.
1. Setting an expiry essentially forces you to manage your subkeys and announces to the rest of the world that you are doing so. Setting an expiry on a primary key is ineffective for protecting the key from loss - whoever has the primary key can simply extend its expiry period. Revocation certificates are [better suited](https://security.stackexchange.com/questions/14718/does-openpgp-key-expiration-add-to-security/79386#79386) for this purpose. It may be appropriate for your use case to set expiry dates on subkeys.
1. To switch between two or more identities on different keys - unplug the first key and restart gpg-agent, ssh-agent and pinentry with `pkill gpg-agent ; pkill ssh-agent ; pkill pinentry ; eval $(gpg-agent --daemon --enable-ssh-support)`, then plug in the other key and run `gpg-connect-agent updatestartuptty /bye` - then it should be ready for use.
1. To use yubikeys on more than one computer with gpg: After the initial setup, import the public keys on the second workstation. Confirm gpg can see the card via `gpg --card-status`, Trust them ultimately (as above). At this point `gpg --list-secret-keys` should show your (trusted) key.
1. To use yubikeys on more than one computer with gpg: After the initial setup, import the public keys on the second workstation. Confirm gpg can see the card via `gpg --card-status`, Trust the public keys you imported ultimately (as above). At this point `gpg --list-secret-keys` should show your (trusted) key.
# Troubleshooting