[plasma] S/MIME for document control

Phillip Hallam-Baker <hallam@gmail.com> Fri, 04 February 2011 15:59 UTC

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Date: Fri, 4 Feb 2011 11:03:08 -0500
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From: Phillip Hallam-Baker <hallam@gmail.com>
To: plasma@ietf.org
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Subject: [plasma] S/MIME for document control
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I have been thinking for a while that S/MIME is probably less useful as a
mail security feature as a document security feature.

Imagine that I could tag a file from Word or Excel with a security policy so
that it woud be automatically saved in an encrypted CMS package with
decryption keys for both me and a document server.

That would be the best way to make sure that the document is encrypted
end-to-end which these days means securing the document in the end point
mobile device as at least as great a priority as on the wire.

There are CMS systems for inside enterprises, but use seems to be marginal
at best and the most interesting/confidential documents in a commercial
environment are almost exclusively those that have to be passed to other
companies to fullfil their function. I.e. the ones exchanged with lawyers,
customers etc. Even patient records need to be exchanged with specialists
from other hospitals.

There is a relevant patent that covers the efficient way to do this -
http://www.freepatentsonline.com/5481613.html, issued in 1994. Currently
assigned to Entrust I believe. Thats only three years and a few months.

Website: http://hallambaker.com/