Date: Thu, 22 Oct 2015 17:37:49 -0600 From: Kurt Seifried <kseifried@...hat.com> To: Daniel Kahn Gillmor <dkg@...thhorseman.net> Cc: oss-security <oss-security@...ts.openwall.com> Subject: Re: Prime example of a can of worms On Thu, Oct 22, 2015 at 4:55 PM, Daniel Kahn Gillmor <dkg@...thhorseman.net> wrote: > On Thu 2015-10-22 01:09:16 -0400, Kurt Seifried wrote: > > Having a large pool of known good primes would be easier for them to use > I > > suspect. Sadly we can't let perfect be the enemy of the good, or in this > > case the "not completely terrible". > > a large pool of known-good primes doesn't help so much, particularly for > the embedded case -- peers that are offered a group need to be able to > easily verify that the group is strong. embedded devices simply aren't > going to carry around a large list of well-vetted primes of short > length, but we could *maybe* convince them to carry around a shorter > list of well-vetted strong primes. > > I'd rather see us increase the security margin for a set of well-vetted > standard groups than ask people to make implementations that can't > determine whether they're in a reasonable group or not. > > --dkg > Sorry when I said a "large" pool I meant more then the current 5 or so that seem to be in popular use, but certainly not more than a few hundred. Basically we're in agreement, I think nothing under 2048 should even be considered, and we probably need to bump that up in a few years anyways. I've also been going through source code to see how people use dh params/treat them, and I have some worrying results (basically what I expected though, everything is terrible as usual) I'm going to be writing this up as an article rather than a long email as I have a few more sticky points to raise (security rabbit holes are so much fun). -- Kurt Seifried -- Red Hat -- Product Security -- Cloud PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 Red Hat Product Security contact: secalert@...hat.com
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