Re: [lamps] Adam Roach's Yes on draft-ietf-lamps-rfc5751-bis-10: (with COMMENT)
Jim Schaad <ietf@augustcellars.com> Tue, 03 July 2018 16:43 UTC
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From: Jim Schaad <ietf@augustcellars.com>
To: 'Adam Roach' <adam@nostrum.com>, 'The IESG' <iesg@ietf.org>
CC: draft-ietf-lamps-rfc5751-bis@ietf.org, 'Russ Housley' <housley@vigilsec.com>, lamps-chairs@ietf.org, spasm@ietf.org
References: <153056475779.16504.16273523283477340877.idtracker@ietfa.amsl.com> <046701d412e2$59aee510$0d0caf30$@augustcellars.com> <4de6554b-0def-ce1d-5e1f-a02ee572c477@nostrum.com>
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Date: Tue, 03 Jul 2018 09:43:36 -0700
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Subject: Re: [lamps] Adam Roach's Yes on draft-ietf-lamps-rfc5751-bis-10: (with COMMENT)
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> -----Original Message----- > From: Adam Roach <adam@nostrum.com> > Sent: Tuesday, July 3, 2018 9:10 AM > To: Jim Schaad <ietf@augustcellars.com>; 'The IESG' <iesg@ietf.org> > Cc: draft-ietf-lamps-rfc5751-bis@ietf.org; 'Russ Housley' > <housley@vigilsec.com>; lamps-chairs@ietf.org; spasm@ietf.org > Subject: Re: Adam Roach's Yes on draft-ietf-lamps-rfc5751-bis-10: (with > COMMENT) > > Jim -- > > Thanks for the quick response. Comments inline. > > On 7/3/18 10:27 AM, Jim Schaad wrote: > > > >> §3.5.3.2: > >> > >>> The values to be placed in the micalg parameter SHOULD be from the > >>> following: > >>> > >>> Algorithm Value Used > >>> MD5 md5 > >>> SHA-1 sha-1 > >>> SHA-224 sha-224 > >>> SHA-256 sha-256 > >>> SHA-384 sha-384 > >>> SHA-512 sha-512 > >>> Any other (defined separately in algorithm profile or "unknown" if > >>> not defined) > >> The example then goes on to demonstrate the use of "micalg=sha-1". > >> This is probably a misunderstanding on my part, but I thought that > >> this document was intending to mark MD5 and SHA-1 as historic for > digesting content (cf. > >> §1.7 and §B.1). Wouldn't that mean they should be annotated as > >> deprecated in some way here? I would have also expected the example > >> to use sha-256 or sha-512. > > In terms of the content of the table, this table is the only registry that exists > for the values to be placed here. This means that I have not removed any of > the "historical" values as I believe that they need to be part of the table. > > Sure; I didn't expect to see them removed. I expected them to be annotated > in some way; something like: > > > Algorithm Value Used > MD5* md5 > SHA-1* sha-1 > SHA-224 sha-224 > SHA-256 sha-256 > SHA-384 sha-384 > SHA-512 sha-512 > Any other (defined separately in algorithm profile or "unknown" if > not defined) > > *Note: MD5 and SHA-1 are historic and no longer considered secure. > See section B.1 for details. That makes sense. Done > > > In terms of the following example, it is one of the examples that I did not > re-generate as part of this document and thus is still setup with a micalg of > sha-1. While I could re-generate this example, it is correct as it is and has > been validated. I cannot have that same assurance if it is replaced. > > I have a lot of sympathy for the challenges involved with generating > correct examples. At the same time, I think it's problematic to publish > a document that deprecates an algorithm while simultaneously > demonstrating its use. On the balance between these two factors, I think > this document really needs to be updated so that the examples are > consistent with the text. Ok - I will put this on my list. It is not a simple think to do. > > /a