Question #676836 on Duplicity changed:
https://answers.launchpad.net/duplicity/+question/676836
Status: Open => Answered
edso proposed the following answer:
symmetric encryption is already the default, if no key is given.
fronm the man page section env vars
"
PASSPHRASE
This passphrase is passed to GnuPG. If this is not set, the user will be
prompted for the passphrase.
"
http://duplicity.nongnu.org/duplicity.1.html#sect6
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