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Re: [babel] hmac info model elements

Juliusz Chroboczek <jch@irif.fr> Fri, 04 January 2019 22:02 UTC

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From: Juliusz Chroboczek <jch@irif.fr>
To: "STARK, BARBARA H" <bs7652@att.com>
Cc: 'Mahesh Jethanandani' <mjethanandani@gmail.com>, Babel at IETF <babel@ietf.org>
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Subject: Re: [babel] hmac info model elements
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>> In my experience, these sorts of shared keys are modeled as strings.

>> I would think the keys are modeled as binary.

> That depends on how we generally expect the keys to be generated. If we
> think they'll be randomly generated by a centralized machine, then
> binary makes sense. If we think they'll be created by a human being who
> will input them through a keyboard, then string makes sense. I was
> thinking the latter would be more common. I'm curious what others think?

There's a third model -- locally generated from a passphrase on the local
host (e.g. using a PSK).

-- Juliusz

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