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Whenever I try decrypting or signing files with GPG in Elementary Luna, I see a graphical password prompt come up for my GPG key.

The key is then cached in memory for future requests for some time. My first thought was to use gpg-agent to purge it from memory or to configure the TTL, but to my surprise, it wasn't installed. seahorse also isn't installed.

What is being used as a GPG agent on Elementary Linux?

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If it's a GNOME based desktop I believe it's built into GNOME, as part of the gnome-keyring-daemon. You can find out the duration the keys are cached using this command:

$ gsettings get org.gnome.crypto.cache gpg-cache-method
'session'

You can see the other keys under the org.gnome.crypto.cache schema with this command:

$ gsettings list-keys org.gnome.crypto.cache
gpg-cache-authorize
gpg-cache-method
gpg-cache-ttl

The "keyring" process will show like so:

$ ps -eaf|grep [k]eyring
saml      2444     1  0 Jun04 ?        00:00:33 /usr/bin/gnome-keyring-daemon --daemonize --login

If you want the daemon to flush it's cached contents:

$ gnome-keyring-daemon -r -d

If you really want a GUI to manage the contents then install seahorse to do so. There isn't a default application that I'm aware of which is typically included with GNOME.

$ seahorse

       ss #1

References

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