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Borislav,

On 9/20/14 11:57 PM, Borislav Trifonov wrote:
> Switched to a configuration where Tomcat is now front-ended by
> Nginx acting as a load balancer, so now the problem has moved to a
>  different spot.

Just curious: how does Nginx do this? IIRC, Nginx can use either
OpenSSL or GnuTLS. What does the configuration look like? It seems
reasonable for httpd/APR to support PSK... perhaps it can be added if
it does not already exist.

> As for the PSK: the computational expense of key exchange (we have
>  many frequent short lived connections) is a con that brings zero 
> benefit to our setup, as the clients are fixed and already have the
>  symmetric keys.

Makes sense.

> I could ask the inverse question: if one controls not just the
> server but also the clients, what's the point of public key
> crypto?

You never mentioned that you had "control" of the clients. Using PSKs
 of course means you have some measure of control over the clients,
but it is not always so.

> The only reason I'm relying on TLS is because the same server also
> needs to occasionally support regular connections using 
> certificates.

Would it be an option to use something like stunnel (I'm not sure if
that allows PSKs, either) between the client and server? It's a lot of
extra processes, but it might get the job done.

- -chris
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