I wrote:
> I'm reading RFC 4880 now, to get my own answers. Still, I would be
> grateful if someone with deeper knowledge would answer my question.
Quoting the last paragraph of section 2.1 of RFC 4880:
Both digital signature and confidentiality services may be applied to
the same message. First, a signature is generated for the message
and attached to the message. Then the message plus signature is
encrypted using a symmetric session key. Finally, the session key is
encrypted using public-key encryption and prefixed to the encrypted
block.
Exactly as I said. So what I'm asking for can certainly be done.
Mark
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