Mainkey with many subkeys??

[Brian Minton]

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I recently created a key, with a RSA 4096-bit main key (certify only)
and 4 subkeys: one DSA for signing, and one ELGamal for encryption, for
communicating with people who I don't know are using ECC, and one each
of ED25519 and nistp384 for people who are.  The cool thing is that
since the dates on the ECC keys are newer, gpg 2.1 and other  versions
that are able to use those keys will do so automatically, while gpg and
other openpgp implementations which don't support ECC will basically
ignore those subkeys and use the DSA/ELGamal ones.  When signing a
message I often just use both signing capable subkeys, so everyone will
be able to check the signature.
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