rework gpg.conf based on the Riseup OpenPGP Best Practices

configs/gnupg/gpg.conf

@@ -1,9 +1,90 @@
-# personal digest preferences
-personal-digest-preferences SHA512
+#
+# This is an implementation of the Riseup OpenPGP Best Practices
+# https://help.riseup.net/en/security/message-security/openpgp/best-practices
+#
+
+
+#-----------------------------
+# default key
+#-----------------------------
+
+# The default key to sign with. If this option is not used, the default key is
+# the first key found in the secret keyring
+
+#default-key 0xD8692123C4065DEA5E0F3AB5249B39D24F25E3B6
+
+
+#-----------------------------
+# behavior
+#-----------------------------
+
+# Disable inclusion of the version string in ASCII armored output
+no-emit-version
+
+# Disable comment string in clear text signatures and ASCII armored messages
+no-comments
+
+# Display long key IDs
+keyid-format 0xlong
+
+# List all keys (or the specified ones) along with their fingerprints
+with-fingerprint
+
+# Display the calculated validity of user IDs during key listings
+list-options show-uid-validity
+verify-options show-uid-validity
+
+# Try to use the GnuPG-Agent. With this option, GnuPG first tries to connect to
+# the agent before it asks for a passphrase.
+use-agent
+
+
+#-----------------------------
+# keyserver
+#-----------------------------
+
+# This is the server that --recv-keys, --send-keys, and --search-keys will
+# communicate with to receive keys from, send keys to, and search for keys on
+keyserver hkps://hkps.pool.sks-keyservers.net
+
+# Provide a certificate store to override the system default
+# Get this from https://sks-keyservers.net/sks-keyservers.netCA.pem
+keyserver-options ca-cert-file=/usr/local/etc/ssl/certs/hkps.pool.sks-keyservers.net.pem
+
+# Set the proxy to use for HTTP and HKP keyservers - default to the standard
+# local Tor socks proxy
+# It is encouraged to use Tor for improved anonymity. Preferrably use either a
+# dedicated SOCKSPort for GnuPG and/or enable IsolateDestPort and
+# IsolateDestAddr
+#keyserver-options http-proxy=socks5-hostname://127.0.0.1:9050
+
+# Don't leak DNS, see https://trac.torproject.org/projects/tor/ticket/2846
+keyserver-options no-try-dns-srv
+
+# When using --refresh-keys, if the key in question has a preferred keyserver
+# URL, then disable use of that preferred keyserver to refresh the key from
+keyserver-options no-honor-keyserver-url
+
+# When searching for a key with --search-keys, include keys that are marked on
+# the keyserver as revoked
+keyserver-options include-revoked
+
+
+#-----------------------------
+# algorithm and ciphers
+#-----------------------------
+
+# list of personal digest preferences. When multiple digests are supported by
+# all recipients, choose the strongest one
+personal-cipher-preferences AES256 AES192 AES CAST5
+
+# list of personal digest preferences. When multiple ciphers are supported by
+# all recipients, choose the strongest one
+personal-digest-preferences SHA512 SHA384 SHA256 SHA224
 
 # message digest algorithm used when signing a key
 cert-digest-algo SHA512
 
-# Set the list of default preferences to string.
-# used for new keys and default for "setpref"
+# This preference list is used for new keys and becomes the default for
+# "setpref" in the edit menu
 default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed