Adding a XMPP proof
Let's add a decentralized XMPP proof to your OpenPGP keys.
Add a message to your XMPP vCard
This is an OpenPGP proof that connects my OpenPGP key to this XMPP account. For details check out https://keyoxide.org/guides/openpgp-proofs
[Verifying my OpenPGP key: openpgp4fpr:FINGERPRINT]
Update the PGP key (basic edition)
First, edit the key (make sure to replace FINGERPRINT):
gpg --edit-key FINGERPRINT
Add a new notation:
Enter the notation (make sure to replace XMPP-ID):
The XMPP-ID looks something like an email address: firstname.lastname@example.org.
Save the key:
Upload the key to WKD or use the following command to upload the key to keys.openpgp.org (make sure to replace FINGERPRINT):
gpg --keyserver hkps://keys.openpgp.org --send-keys FINGERPRINT
And you're done! Reload your profile page, it should now show a XMPP account.
Update the PGP key (OMEMO edition)
XMPP communication can be end-to-end encrypted with OMEMO. Verifying OMEMO fingerprints is essential to trust your communication and keep it safe from Man-in-the-Middle attacks.
Keyoxide makes the fingerprint verification process easy for all. Add a special identity proof that not only contains your XMPP-ID but also the fingerprints of all your OMEMO keys.
If your XMPP identity proof is verified, a QR code is shown. Anyone can scan this QR code using XMPP apps like Conversations (free on F-Droid) to not only add you as a contact, but also verify your OMEMO keys with the highest level of trust.
Making this identity proof yourself can be a tad difficult when using clients like Gajim, but luckily for us, Conversations can directly generate the proof by going to Account details > Share > Share as XMPP URI. The resulting URI should look something like:
To take advantage of the easy and secure XMPP identity proof including OMEMO fingerprints, follow the basic edition guide above but replace XMPP-ID with the URI obtained through the Conversations app.