Re: [Lurk] [TLS] WG Call for adoption of draft-rescorla-tls-subcerts

Yaron Sheffer <yaronf.ietf@gmail.com> Tue, 18 July 2017 21:06 UTC

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To: Watson Ladd <watsonbladd@gmail.com>, "Fossati, Thomas (Nokia - GB/Cambridge, UK)" <thomas.fossati@nokia.com>
Cc: LURK BoF <lurk@ietf.org>, tls@ietf.org
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From: Yaron Sheffer <yaronf.ietf@gmail.com>
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Date: Tue, 18 Jul 2017 23:06:34 +0200
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Subject: Re: [Lurk] [TLS] WG Call for adoption of draft-rescorla-tls-subcerts
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On 18/07/17 18:34, Watson Ladd wrote:
>
>     I understand the logics but, since LURK boxes don’t scale, the
>     cost to cover your entire footprint for the sporadic cases when
>     the CA is down might be a bit prohibitive.
>
>
> CA reliability is not good.
>
>
 From my own experience, I agree that CA reliability is "not good". 
However if I'm using short-term certs with say, a 7 day validity, and 
(per draft-ietf-acme-star) the next certificate is issued halfway 
through this period, it means that the CA has to to be unavailable for 
all of 3.5 days for the failure to affect the delegated site. That's a 
lot, even for a CA.

On the other hand the LURK signing box (though managed by the same 
organization, which is a clear benefit) needs to be available at the 
same level of the delegated site - 99.99% of the time or whatever your 
standard is.

Thanks,
     Yaron