Speaking within the context of https SSL certs, is there any real value
   to a key/cert above 2048 bits?
   The reason I asked: updating a few certs at office recently I nuked an
   older F5 LTM device by installing a 4096 bit key/cert pair - the load
   on the appliance (Linux based) shot up from less than 1 to about 30 and
   became so excruciatingly slow it was nearly impossible to back the
   change out (web GUI and ssh were both nearly non-responsive)..
   On modern hardware, including modern F5s, this problem doesn't exist...
   but from what reading I've done it seems 4096 buys you very little
   anyway ?
   With a theoretical quantum computer attacking is there any significant
   gain with the bigger key size?
   Curious what others think....
   John
   --
   Sent from my Android device with K-9 Mail. Please excuse my brevity.