On 17/11/2013 22:25, Learmonth, Iain Ross wrote:
>>> Also, to completely contradict that point, facebook with https enabled 
>>> still uses a CDN, so the theory that https prevents CDNs from working is 
>>> apparently wrong anyway.
> 
>> I said "possibly" because I wasn't sure. Maybe somebody can explain
> how it works and how the associated trust model works?
> 
> The CDN has one TLS connection from the client to the CDN and another from 
> the CDN to the server, it sees everything in plaintext. A CA signs the CDNs 
> TLS server certificate so that it can still be accepted by browsers. 
> Depending on the CA, different verifications of ownership may be made.
> 
> This does raise the issue that these CDNs, which may be managing many large 
> services, would be a great place to tap the wires. Maybe we should be 
> discouraging them?

Yep, that's my concern about the trust model (also after redaing Ted Lemon's 
response).

All I know is that some site I have decided to trust has redirected me
to content on a third-party site, which presents an apparently valid cert.
I don't understand why I should trust that third-party site.

   Brian
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