Help with S/MIME illustration

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1

Hi, I’am trying to illustrate complete process of sending message encrypted by S/MIME with triple-encapsulation.

Here is the illustration that I have done.

http://img31.imageshack.us/img31/6876/aqfx.jpg

Please comment. I think I am missing something out.
Any help will be greatly appreciated!

2

I’m not an expert on this topic, but I assume you are attempting to implement this?
http://www.ietf.org/rfc/rfc2634.txt

3

Hey,
Thanks for reply.
This realy is described in that RFC2634, but it is not very clear what is happening in each stage and what is the output of each stage.
I couldn’t find a single detailed illustration of S/MIME on the internet.
On the other hand, processes of PGP are illustrated in detail on many sites.

Someone please help with.