Gervase Markham | 9 Feb 14:10
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Re: Google about to fix the CRL download mechanism in Chrome

On 09/02/12 12:54, Rob Stradling wrote:
> We've calculated that there are currently ~53,000 revoked Server
> Authentication certs that were issued by Comodo's CA systems, each with
> a serial number of 16 bytes (+ a leading zero byte if required to ensure
> it's not treated as a negative number). That adds up to well over 800KB.
> And obviously we're not the only CA!

Which is why he's obviously not going to transmit the information as a 
list of serial numbers :-)

He's probably planning something vaguely like this:
http://en.wikipedia.org/wiki/Bloom_filter

Gerv
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Gmane