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devel / comp.protocols.kerberos / Re: RFC 4121 & acceptor subkey use in MIC token generation

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o Re: RFC 4121 & acceptor subkey use in MIC token generationNico Williams

1
Re: RFC 4121 & acceptor subkey use in MIC token generation

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From: nic...@cryptonector.com (Nico Williams)
Newsgroups: comp.protocols.kerberos
Subject: Re: RFC 4121 & acceptor subkey use in MIC token generation
Date: Thu, 26 Oct 2023 13:17:37 -0500
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 by: Nico Williams - Thu, 26 Oct 2023 18:17 UTC

On Thu, Oct 26, 2023 at 01:41:42PM -0400, Ken Hornstein via Kerberos wrote:
> >Yeah; IIRC that was to allow cases where the initiator would send the first
> >context token in the same packet/message with early data, such as a MIC
> >binding the exchange to some channel. In retrospect, perhaps it has caused
> >more trouble than it was worth. We didn't use this in RFC 4462 userauth,
> >which doesn't use mutual anyway.
>
> As a side note, my impression is that gss-keyex has fallen out of favor,
> and at least for us part of the problem is the unfortunate decision
> to use MD5 in that protocol. You and I both know that the use of MD5
> in there isn't security related, but if you live in a FIPS world
> then any use of MD5 is a "challenge".

What MD5? It's used for generating a mechanism name, which has no
security implications. You can hardcode the OID->name mappings so you
don't invoke MD5.

Nico
--

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