Re: [dane] Digest Algorithm Agility discussion
Peter Palfrader <peter@palfrader.org> Sat, 22 March 2014 07:47 UTC
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Date: Sat, 22 Mar 2014 08:47:37 +0100
From: Peter Palfrader <peter@palfrader.org>
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References: <20140315051704.GY21390@mournblade.imrryr.org> <0l4n2sa5a0.fsf@wjh.hardakers.net>
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Subject: Re: [dane] Digest Algorithm Agility discussion
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On Thu, 20 Mar 2014, Wes Hardaker wrote: > Do you, Mr. System Administrator defining the local policy for the > *client*, want: > > A) Accept any published hashing algorithm out of my "unordered set" > to validate the remotely presented certificate. [Ordering it > doesn't buy you anything since you'll simply accept a match and it > doesn't matter which you try first, since any success in any > algorithm will equally indicate "ok"; in fact in an implementation > aiming for speed, it might be best to choose the order based on > how fast you can execute the algorithm]. If the server fails to > publish a perfect record set, as long as one matches I'm ok with that. > > B) Believe that the server will always publish perfect records, and > if my "ordered set" of algorithms is [SHA512, SHA256] and they > publish SHA512, then I never want to accept SHA256 because I fear > an attack more than I fear a server administrator blowing their > configuration. > But the real question, is what is the *default* that we should suggest > an implementation do? > II) what should we do in SMTP? This is where Viktor, considering case > #2 above, is wanting to do B ("accept just the 'best' in an ordered set > of algorithms) instead of A. The arguments, though, from both sides > are probably talking about different cases (generic vs SMTP) and I > think that is ending up with some of the confusion. I'd like to see the SMTP draft suggest B. (All the others should do B too, but that's a different story). Aloha, -- | .''`. ** Debian ** Peter Palfrader | : :' : The universal http://www.palfrader.org/ | `. `' Operating System | `- http://www.debian.org/
- [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Martin Rex
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion (c… Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Jim Schaad
- Re: [dane] Digest Algorithm Agility discussion (c… Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion (c… Andrew Sullivan
- Re: [dane] Digest Algorithm Agility discussion (c… Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion (c… Scott Rose
- Re: [dane] Digest Algorithm Agility discussion (c… Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion (c… Scott Rose
- Re: [dane] Digest Algorithm Agility discussion Wes Hardaker
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Wes Hardaker
- Re: [dane] Digest Algorithm Agility discussion Wes Hardaker