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Forum Discussion

Anesh's avatar
Anesh
Icon for Cirrostratus rankCirrostratus
Jun 08, 2018

SSL TPS license limits on 4096 bit key size versus RSA 4096 bit key size

The article K6475 mentions only 20% of the license is available for RSA key sizes over 4096 bits and greater   Does it mean   if the box can support 4000 SSL TPS connections , when using RSA...
application delivery
LTM
security
Simon_Blakely's avatar
Simon_Blakely
Icon for Employee rankEmployee
Jun 10, 2018

if the box can support 4000 SSL TPS connections , when using RSA 4096 bit keys we get only 800 SSL TPS connections?

 

That is correct. This is because handling 4096 bit keys requires approximately 5 times the CPU of a 2048 bit key.

 

Does this rule also apply for key sizes that are 4096 bits and NOT RSA?

 

As stated in K6475,

 

The key-based SSL TPS limit applies per core and only to RSA ciphers.