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Re: [kitten] [Curdle] Diffie-Hellman modulus sizing in Kerberos PKINIT

Robbie Harwood <rharwood@redhat.com> Mon, 02 August 2021 17:13 UTC

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From: Robbie Harwood <rharwood@redhat.com>
To: "Mark Baushke (ietf)" <mbaushke@gmail.com>
Cc: curdle@ietf.org, kitten@ietf.org
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Subject: Re: [kitten] [Curdle] Diffie-Hellman modulus sizing in Kerberos PKINIT
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"Mark Baushke (ietf)" <mbaushke@gmail.com> writes:

> Hi Robbie,
>
> I made a few mistakes in my last message.

No worries.  To be sure I understand, though, please let me know if this
matches what you're suggesting:

    - 1k: MUST NOT (matches the draft)
    - 2k: SHOULD NOT (strengthen the draft's MAY)
    - 4k: MUST (matches the draft)
    - 6k/8k: MAY (not present in draft)

I'm probably fine to add larger groups like the 6k and 8k you suggest at
MAY.  If I read right, Heimdal implements MODP 6k and 8k already.

For completeness: Heimdal also implements 3072-, 1636-, and 768-bit
MODP.  It seems worth taking a position on those groups as well.  I
imagine that position would be imagine would be:

    - 3072: MAY
    - 1636: SHOULD NOT
    - 768: MUST NOT

(though it may be cleaner to adjust the language to address sizes rather
than specific groups at that point).

Be well,
--Robbie

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