# The option --use-tor Dirmngr and thus GnuPG into “Tor mode” to route all network access via Tor (an anonymity network).
use-tor

# Provide a certificate store to override the system default
# Get this from https://sks-keyservers.net/sks-keyservers.netCA.pem
hkp-cacert /etc/ssl/certs/sks-keyservers.netCA.pem