Apparently newer gnupg has support for hardware-accelerated AES-NI. It
would be good to have an option to use that. I also wonder if using the
same symmetric key for many files presents a security issues (and whether
using GPG keys directly would be more secure).

> [[done]]; you can now use encryption=pubkey when setting up a special
> remote to use pure public keys without the hybrid symmetric key scheme.
> Which you choose is up to you. Also,  annex.gnupg-options can configure
> the ciphers used. --[[Joey]]