Re: [saag] SHA-1 to SHA-n transition
Eric Rescorla <ekr@networkresonance.com> Tue, 03 March 2009 17:34 UTC
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Date: Tue, 03 Mar 2009 09:57:24 -0800
From: Eric Rescorla <ekr@networkresonance.com>
To: Peter Gutmann <pgut001@cs.auckland.ac.nz>
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References: <0DE6E86D395C657BABF43B97@minbar.fac.cs.cmu.edu> <E1LeXZP-0000x0-NP@wintermute01.cs.auckland.ac.nz>
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Cc: saag@ietf.org, mouse@Rodents-Montreal.ORG, Nicolas.Williams@sun.com
Subject: Re: [saag] SHA-1 to SHA-n transition
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At Wed, 04 Mar 2009 05:34:15 +1300, Peter Gutmann wrote: > > Jeffrey Hutzelman <jhutz@cmu.edu> writes: > > >How do you expect users to remember not to give away their passwords when > >they can't be bothered to remember to wash their hands or look both ways > >before crossing a street? > > site_password = HMAC( user_password || 128-bit salt, site_URL ); > > (or assorted variations thereof, there are a pile of password-fortification > techniques around, and all manner of free and low-cost commercial products > that implement them). That way even if they hand their password over a > phisher, it won't do the phisher much good. > > At this point I expect the peanut gallery to jump in with the usual million or > so corner cases where this won't work, but the important point is that the > above would help most of the people most of the time, and in particular it'd > help the demographic who are most likely to fall into phisher traps, i.e. non- > technical people for whom the standard "the salt isn't portable across my > eight computers and three laptops and therefore your scheme isn't worth > trying" objection doesn't apply. Peter, While I think this general class of solutions has some utility, but the difficulty is that it requires some UI mechanism to stop the phisher from convincing the user to type their password into a dialog which goes directly to the phisher rather than being hashed. I'm unaware of any general solution to that problem, and this is not really a corner case but rather the main case. -Ekr
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- [saag] SHA-1 to SHA-n transition Stephen Kent
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Hannes Tschofenig
- Re: [saag] SHA-1 to SHA-n transition Stephen Kent
- Re: [saag] SHA-1 to SHA-n transition Chandersekaran, Coimbatore S
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Yoav Nir
- Re: [saag] SHA-1 to SHA-n transition Pasi.Eronen
- Re: [saag] SHA-1 to SHA-n transition David McGrew
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Santosh Chokhani
- Re: [saag] SHA-1 to SHA-n transition der Mouse
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Paul Hoffman
- Re: [saag] SHA-1 to SHA-n transition David Harrington
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Michael O'Neill
- Re: [saag] SHA-1 to SHA-n transition Theodore Tso
- [saag] Deployment Deadlock Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Bill Sommerfeld
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- [saag] Channel binding is great but not a silver … Sam Hartman
- Re: [saag] Channel binding is great but not a sil… Nicolas Williams
- Re: [saag] Channel binding is great but not a sil… Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] Channel binding is great but not a sil… Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] Channel binding is great but not a sil… Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] Channel binding is great but not a sil… Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] Channel binding is great but not a sil… Alan DeKok
- Re: [saag] Channel binding is great but not a sil… Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] Channel binding is great but not a sil… Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] Channel binding is great but not a sil… Alan DeKok
- [saag] Or grow a real PKI (Re: SHA-1 to SHA-n tra… Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Stephen Kent
- Re: [saag] Channel binding is great but not a sil… Stephen Kent
- Re: [saag] Channel binding is great but not a sil… Stephen Kent
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Stephen Kent
- Re: [saag] Channel binding is great but not a sil… Nicolas Williams
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Nicolas Williams
- Re: [saag] Deployment Deadlock Pasi.Eronen
- Re: [saag] Deployment Deadlock Hallam-Baker, Phillip
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Nicolas Williams
- Re: [saag] SHA-1 to SHA-n transition Nicolas Williams
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Hallam-Baker, Phillip
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Stephen Kent
- Re: [saag] Or grow a real PKI (Re: SHA-1 to SHA-n… Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Eric Rescorla
- Re: [saag] SHA-1 to SHA-n transition Peter Gutmann
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Jeffrey Hutzelman
- Re: [saag] SHA-1 to SHA-n transition Theodore Tso
- Re: [saag] SHA-1 to SHA-n transition Hallam-Baker, Phillip
- Re: [saag] SHA-1 to SHA-n transition Bill Sommerfeld
- [saag] Credential portability RE: SHA-1 to SHA-n … Hallam-Baker, Phillip