* Change the internal representation of keyid into a struct which
can also hold the localid and extend the localid to hold information
of the subkey number because two subkeys may have the same keyid.
* Add a way to override the current cipher/md implementations
by others (using extensions)
* Not GnuPG related: What about option completion in bash?
Can "--dump-options" be used for this or should we place the
options in an ELF note section?
* Split key support (n-out-of-m). Use our own protocol or figure out
how PGP does it.
* add an option to re-create a public key from a secret key; we
can do this in trustdb.c:verify_own_keys. (special tool?)
Hmmm, we better drop the duplication of the public part and just keep
the secrets in the "secring" - this has the additional that we can
put those secrets on a hardware token.
* write a tool to extract selected keys from a file.
* Change the buffering to a mbuf like scheme? See Michael's proposal.
* Keep a list of duplicate, faked or unwanted keyids.
* The current code has knowledge about the structure of a keyblock.
We should add an abstraction layer so that adding support for
different certificate structures will become easier.
* "Michael T. Babcock" <email@example.com> suggested to write
an event log so that other software can display a key history or
alike with GnuPG results. This should be connected to the keyrings.
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