From 07134a4e4f3e532cd8783714049bcabe21b6bdbd Mon Sep 17 00:00:00 2001 From: Jason Stelzer Date: Mon, 4 May 2020 08:22:14 -0400 Subject: [PATCH] GPG keys on multiple computers I feel like this took me longer to figure out than it should have. --- README.md | 1 + 1 file changed, 1 insertion(+) diff --git a/README.md b/README.md index 53b7c91..129d397 100644 --- a/README.md +++ b/README.md @@ -2330,6 +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. # Troubleshooting