How to decrypt a message while preserving the signature?
Mark H Weaver
mhw at netris.org
Sun Nov 3 08:15:40 CET 2019
> 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
Exactly as I said. So what I'm asking for can certainly be done.
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