User Guide
You will need pcscd service running in Linux for the AppImage to work.
sudo apt install pcscd -y
sudo systemctl restart pcscd
sudo dnf install pcsc-lite
sudo systemctl restart pcscd
On Mac Sillicon systems, the dmg should just work.
After you upload an openpgpkey to the Yubikey, remember to change/update the admin pin and the user pin. The default admin pin is 12345678 and user pin is 123456.
The application stores the database in ~/.tumpa/ directory.
Remember to give a strong passphrase for the key. By default we are creating Cv25519 key, but in the advanced section you can choose to create RSA4096 key too. You can also select an expiry date for the keys.
You can click on details button and see the details about any key.
If you need to generate a key like in an air gapped Tails, but you don't have access to such a system (say you are running on Apple Silicon Mac), you can use the "One shot" mode and generate a key and upload to the smartcards (more than 1 card is better for backup). When you close the application, the secret part of the key is erased from the memory.
Every time we upload a key to the Yubikey, we have to change the admin & user pin.