Long time ago, I tried to use GnuPG for singing and encrypting emails. I remember uploading some keys to the MIT PGP Public Key Server and they still exists there!

Now, I wanted to start to use it again, and keep a healthy and usable public key.

Create a public/private key

$ gpg --expert --full-gen-key

I used this values for creating the key:

• ECC (sign and encrypt)
• Curve 25519
• 2 years of expiration time

List available keys

Once the key pair is created, you can list the available keys:

$ gpg --list-sigs
/home/marcos/.gnupg/pubring.kbx
-------------------------------
pub   ed25519 2026-01-13 [SC] [caduca: 2028-01-13]
      0AB25347D0BC94600DE1548B382154DEBCB48AF4
uid        [  absoluta ] Marcos Gabarda <hey@marcosgabarda.com>
sig 3        382154DEBCB48AF4 2026-01-13  [autofirma]
sub   cv25519 2026-01-13 [E] [caduca: 2028-01-13]
sig

In this case:

• 0AB25347D0BC94600DE1548B382154DEBCB48AF4 is the fingerprint.
• 382154DEBCB48AF4 is the key ID.

Send public key to a public keyserver

The public key can be sent to a public keyserver. By default, hkps://keys.openpgp.org is used as keyserver:

$ gpg --send-key 382154DEBCB48AF4
gpg: enviando clave 382154DEBCB48AF4 a hkps://keys.openpgp.org

It's possible to send the public key to a different one:

$ gpg --keyserver hkps://keyserver.ubuntu.com --send-key 382154DEBCB48AF4
gpg: enviando clave 382154DEBCB48AF4 a hkps://keyserver.ubuntu.com