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[Cfrg] I like PKEX

"Salz, Rich" <rsalz@akamai.com> Thu, 16 November 2017 07:11 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: "cfrg@irtf.org" <cfrg@irtf.org>
Thread-Topic: I like PKEX
Thread-Index: AQHTXqoTZAQltIulBkOMVFlFBjIuLg==
Date: Thu, 16 Nov 2017 07:11:09 +0000
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Subject: [Cfrg] I like PKEX
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I think the PKEX stuff is very interesting.  It inverts the trust model used on the Web.   Suppose I want to do some online banking with mybank.com. My browser checks the server cert, and decided to trust it if the CA verifies the identity. I then type my name and password into the website. There is a risk if I end up at the wrong website.

With PKEX, I can use my name and password and the bank can use something like my account number or other similar info, and we exchange and get a shared secret. We then use that secret to get an authenticated ECDSA key and then I switch to TLS and get its benefits.  No third-party trust is needed.

I think this solves an interesting use-case and it would be nice to have it in our toolbox.

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