One GnuPG/PGP key pair, two emails?

I have two emails I use frequently, for both of which I'd like to use PGP keys generated/managed by GnuPG. I'd like to avoid creating a different key pair for each email, if possible, as that's unnecessary for my situation, i.e. I use the two emails interchangeably.

Is there a way to do this?

I am using Mac OS X 10.5 and Ubuntu 11.04, and Thunderbird 3.1.10.

Thanks in advance!

3 Answers

If you want to add an user ID to an existing key from the command line (your input is in bold):

 $ gpg --edit-key <key-id> gpg> adduid Real Name: <name> Email address: <email> Comment: <comment or Return to none> Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O Enter passphrase: <password> gpg> uid <uid> gpg> trust Your decision? 5 Do you really want to set this key to ultimate trust? (y/N) y gpg> save$ gpg --send-keys <key-id>

Assuming that you use Enigmail for GPG support in Thunderbird, you can simply use the "OpenGPG Security" Tab for each of your identities. You can get there via

Account Preferences -> Manage Identities -> Edit.

Alternatively, you can select from the Menu:

 OpenPGP -> Key Management -> [Right-click on your key] -> Manage User IDs

And then add more IDs to your key.

1. Install Kgpg (yeah I also hate that it installs KDE libs...)

2. Select your key

3. Right click --> Add User Id