utf8-strings keyserver hkp://keyserver.ubuntu.com personal-digest-preferences SHA512 cert-digest-algo SHA512 default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed keyserver-options no-honor-keyserver-url,no-self-sigs-only,no-import-clean