I'm using GNU GPG. I want to replace my old keypair with a new one, and I have a couple of specific questions as I haven't done this before!
My keyring currently contains both the new and old keypairs.
I think I need to sign the new key with the old, to prove that it's actually mine:
gpg --default-key <old> --sign-key <new>
And then push the new key to the MIT keyserver (which currently contains my old key):
gpg --keyserver pgp.mit.edu --send-key <new>
What would the commands be to revoke the old key, and push that to the keyserver?
I've been told I should create a 'revocation certificate' immediately for my new key. What is this for? Is there a command to do this with gpg?
Many thanks for any help!