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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!

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Which OS do you use? What is your mail client of choice? – Kirk Jun 5 '11 at 15:40
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2 Answers

up vote 1 down vote accepted

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
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What does gpg> uid <uid> do? Is <uid> just my email address foo@bar.com? – Computist Jun 6 '11 at 1:43
@lumeng.dev: is the number right before your new user ID (the list is shown after adduid). Once you enter this command, there should be an asterisk near it, indicating that this is the uid trust will operate on. – kAlug Jun 6 '11 at 1:51
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up vote 2 down vote

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.

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Don't forget to add an user ID for the second email address to your key, through OpenPGP -> Manage keys. – grawity Jun 5 '11 at 19:48
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