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Status Future consideration
Workspace z/OS
Categories SSL
Created by Guest
Created on Nov 4, 2016

RELATED IDEAS

Reduce CPU consumption for cipher suites including DH

We call in our CICS applications external webservices and external http requests, which are hosted at external Partners, means there is a http conversation between CICS and an external Partner, in which CICS has the role Client. For security reason there is the requirement to encrypt This communication via SSL/TLS. For this Task there are different cipher suites available with different key lengths and different encryption processes. We realized, that it consumes a lot of CPU if we use ciphers suites which include Diffie-Hellmann, e.g. TLS_DHE_RSA_WITH_AES_256_CBC_SHA, because a lot of the calculations are execucuted in SW, means on the usual GP CPUs. Other suites are completely calculated in crypto Hardware, but the modern cipher suites mainly use DH. We reduced the cipher suites to the following list 0A2F35 to avoid the CPU Overhead, but this is only a short term solution (TLS_RSA_WITH_AES_256_CBC_SHA is actually used). The middle-term solution should be to offer more stronger and modern cipher suites, without any Overhead in the CPU. consumption.

Idea priority High
  • Guest
    Reply
    |     Feb 2, 2017

    I have opened a second RFE as you proposed for the support for Diffie-Hellman in the crypto coprocessor cards (CEXnC), the id is 100412.

  • Guest
    Reply
    |     Jan 31, 2017

    After reviewing the submitted RFE, it appears there are two requirements being presented.

    1. Having support for Diffie-Hellman in the crypto coprocessor cards (CEXnC)
    2. Having equivalent System SSL crypto progressing for Diffie-Hellman in both FIPS and non-FIPS mode

    If this is correct (please confirm), it will be best to address these requirements in separate RFEs. The currently opened RFE can address the System SSL requirement to have equivalent DH support in both FIPS and non-FIPS mode and a new RFE can address the crypto card requirement.

  • Guest
    Reply
    |     Nov 9, 2016

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/OS
    Component - SSL
    Operating system - IBM z/OS
    Source - Client

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/OS
    Component - PKI
    Operating system - IBM z/OS
    Source - Client

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