Ryan,
The current CMS format used by S/MIME allows for only a single algorithm
to be used for encrypting the content. While there are several
different ways around this, the only ones that I consider to be
practical are to either 1) send two messages as you presently do or 2)
install a Domain boundry server (ala RFC 3183) to change the build
encryption algorithm.
jim
-----Original Message-----
From: owner-ietf-smime(_at_)mail(_dot_)imc(_dot_)org
[mailto:owner-ietf-smime(_at_)mail(_dot_)imc(_dot_)org] On Behalf Of Ryan Koh
Sent: Tuesday, January 21, 2003 10:03 PM
To: ietf-smime(_at_)imc(_dot_)org
Subject: Multiple symmetric algo-encrypted data in single S/MIME message
Hi
My organisation users need to communicate with 2 groups of users, on
different S/MIME secure mail systems. The problem lies in them using
different symmetric algorithms for data encryption. I am assessing
possibility of building a single mail client to compose and send S/MIME
messages to selected users on both nets, at the same time (i.e. at one
sending operation). This means that there would logically be 2 sets of
encrypted blobs in the S/MIME message sent out, but I am not sure if
this is supported in S/MIME format.
The easy way out of course is to send out the same mails twice
separately, to users of each group, as what we are doing now. This
however is neither efficient nor elegant.
Any suggestion/recommendation would be greatly appreciated.
Thanks
Ryan Koh
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