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Date: Wed, 21 Oct 2015 23:09:16 -0600
From: Kurt Seifried <>
To: oss-security <>
Subject: Re: Prime example of a can of worms

On Wed, Oct 21, 2015 at 10:45 PM, Joshua Rogers <> wrote:

> On 22/10/15 15:27, Kurt Seifried wrote:
> > Ideally we'd like
> > to see people using different primes (e.g. hardware manufacturers not
> using
> > the same primes as everyone else) and where possible people needing more
> > security (e.g. a VPN hosting provider) should generate their own keys
> > securely.
> Could it be possible to generate a new prime in the background, and when
> it has been generated, on the next reboot use that one instead? And if
> there is not enough time for the new prime to be generated, it falls
> back to the old one?
> I agree that manufacturers should be using a different prime per, at
> least, batch of products.
My fear would be device makers getting it horribly wrong on the devices in
question. E.g.:

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".

> Thanks,
> --
> -- Joshua Rogers <>


Kurt Seifried -- Red Hat -- Product Security -- Cloud
PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
Red Hat Product Security contact:

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