Am 09.09.2013 18:12, schrieb Paul Wouters: > On Mon, 9 Sep 2013, Reindl Harald wrote: >>> I don't get it, either >> >> google "dhe versus ecdhe performance" >> >> http://vincent.bernat.im/en/blog/2011-ssl-perfect-forward-secrecy.html >>>> Let’s focus on the server part. Enabling DHE-RSA-AES128-SHA cipher suite >>>> hinders the performance of TLS handshakes by a factor of 3. Using >>>> ECDHE-RSA-AES128-SHA instead only adds an overhead of 27%. However, if we >>>> use the 64bit optimized version, the cost is only 15% >> >> is that enough to understand why nobody on this world is using DHE and so your >> "Current Fedora supports perfect forward secrecy just fine" is *far* away >> from the reality? > > Not for me. I thought TLS was latency bound. The above "factor 3" does > not state whether TLS client/server were in the same LAN (or even VMs on > the same host). it does not matter, the world measures CPU load here > For the client, clearly CPU is not the limiting factor if you stay on topic you realize that this does not matter you can't do PFS to *any* major website these days > For regular TLS servers, this should also not matter. For fully loaded TLS > servers or TLS accelerators, the factor 3 on the CPU load will matter, but > we're talking clusters of machines here. Dropping in a few extra machines > shouldn't be that hard to give your patent-encumbered endusers PFS. *you* are talking clusters here >> it does not help much support forward secrecy in a way *nobody* else on this >> planet is supporting it and so you repsonse below is uneducated - period > > Ignoring the obvious legal (and now potential backdoor) problems with > ECC is also not very educated we are speaking about the real world, not about therory *you can't* do PFS to *any* relevant target because nobody offers negotiation with DHE - so stay on topic and as long nothing is *proven* ignore it while it *is* proven that PFS doe snot work with Redhat/Fedora systems to the rest of the world
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