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Status Future consideration
Workspace z/OS
Categories ICSF
Created by Guest
Created on Jul 3, 2023

RELATED IDEAS

ICSF Hardware Support for (EC)DHE Key Exchange & TLS1.3 Handshakes

Even for TLS1.2 and for TLS1.3, (EC)DHE key exchange becomes more and more required. (EC)DHE based Ciphers are currently only minimal supported by Hardware (CPACF/Crypto CoProcessor). Also, TLS1.3 has a much larger footprint in terms of CPU consumption compared to TLS1.2 for the handshake. (EC)DHE ciphers become mandatory for example for OpenShift and other services running in the open world.


We used TLS1.3 in our CICS regions, where CICS acted as client to REST Services in OpenShift. The overhead for SSL on an S8 TCB in CICS was about 50ms CPU per TLS handhake. After we switched it back to TLS1.2 it requires only between 1ms and 10ms of CPU.


ICSF and Hardware Support should be enhanced to support more algorithm that are used by (EC)DHE Ciphers. Also, TLS1.3 Handshakes should be supported more in Hardware. Otherwise, this would require much larger machines and costs.



Idea priority Urgent
  • Guest
    Reply
    |     Jul 11, 2023
    We will add this item to the ICSF backlog. Thanks.

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