Channel Bindings presentation from IETF 58 SAAG meeting

Attached.

I've added notes to some of the slides and one slide that should have
been there ("Goals").  No slides have been modified.

The most consisten feedback I have received since I made the
presentation is that it was much too long, for which I apologize.

I have also received positive feedback on the concept of IPsec channels,
which is encouraging.

Cheers,

Nico
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