Re: [secdir] [saag] Interest in draft-dong-savi-cga-header-03.txt; possibility of a five minute slot at saag?

Sam Hartman <hartmans-ietf@mit.edu> Thu, 29 July 2010 08:13 UTC

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From: Sam Hartman <hartmans-ietf@mit.edu>
To: Stephen Kent <kent@bbn.com>
References: <tsl630fmwok.fsf@mit.edu> <p06240805c86a38f57df9@[128.89.89.72]> <BF345F63074F8040B58C00A186FCA57F1F66885082@NALASEXMB04.na.qualcomm.com> <p06240801c86d39d160ab@[192.168.9.234]> <BF345F63074F8040B58C00A186FCA57F1F6688540F@NALASEXMB04.na.qualcomm.com> <p06240807c876e0f794c1@[130.129.114.216]>
Date: Thu, 29 Jul 2010 04:14:13 -0400
In-Reply-To: <p06240807c876e0f794c1@[130.129.114.216]> (Stephen Kent's message of "Thu\, 29 Jul 2010 03\:53\:34 -0400")
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Cc: "Laganier, Julien" <julienl@qualcomm.com>, Dong Zhang <zhangdong_rh@huawei.com>, "secdir@ietf.org" <secdir@ietf.org>, PaddyNallur <paddy@huaweisymantec.com>, "saag@ietf.org" <saag@ietf.org>, Margaret Wasserman <mrw@painless-security.com>, Sam Hartman <hartmans-ietf@mit.edu>
Subject: Re: [secdir] [saag] Interest in draft-dong-savi-cga-header-03.txt; possibility of a five minute slot at saag?
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>>>>> "Stephen" == Stephen Kent <kent@bbn.com>; writes:

    Stephen> I agree that the primary motivation for CGAs arose in the
    Stephen> SeND context, and that privacy is an independent
    Stephen> feature. But, the context in which CGAs were intended to
    Stephen> provide an ability to establish a binding to an IPv6
    Stephen> address was local. When one moves beyond this local
    Stephen> context, and one advocates having more distant nodes
    Stephen> challenge a host, this creates privacy questions.

I think we've been looking at CGAs that have non-local scope for a
while.  Section 7.4 of RFC 3972 seems to anticipate CGAs used with other
protocols.  It's my understanding that shim6 supports both HBAs and CGAs
for non-local contexts.  I also believe the MIP6 context for CGA use is
non-local.