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Angel_Lopez_116's avatar
Angel_Lopez_116
Icon for Altostratus rankAltostratus
Apr 08, 2015

Impact of key size in SSL TPS

Hi,

 

According to SOL13067 the impact of move from 1K keys to 2K keys is around a factor of 1/5, decreasing the maximum SSL TPS from 50.000 to 10.000 in a Viprion B2150. I've been asked about the impact of moving to 4K keys for both server certificates (virtual servers) and client certificates (client authentication). Could I assume a performance reduction of 1/5 too? So I'd get about 2.000 SSL TPS with 4K keys, right?

 

application delivery
LTM
performance
ssl
TMOS
tps
  • nathe's avatar
    nathe
    Icon for Cirrocumulus rankCirrocumulus
    Apr 08, 2015

    Angel,

     

    It talks about 4k keys in the SOL you reference:

     

    "Note: F5 Product Development has not yet completed performance testing for the impact of 4096-bit keys. However, they have determined the theoretical impact could be as much as a 17x performance decrease over 1024-bit keys."

     

    You may wish to raise a support case to see if there is any update on this but i see the SOL was last modified this month so there may not be any more info.

     

    N