All,
In case you haven't heard, S/MIME and PGP have been broken:
https://efail.de/efail-attack-paper.pdf
The MTA attacks (using HTML links) don't affect us, but the cryptographic attacks against them *do*.
I've updated the IPP WG slides with a link to this paper and some discussion points for the IPP Encrypted Jobs and Documents segment...
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Michael Sweet, Senior Printing System Engineer