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Status Not under consideration
Workspace z/OS
Categories SMP/E
Created by Guest
Created on Feb 22, 2024

RELATED IDEAS

SMP/E Root CA certificate change request

Current IBM SMP/E Root certificate, DigiCert Global Root CA, is using weak SHA1 algorithm. We are working on replacing all certificates using SHA1 with much more secure SHA256.

Many vendors already switched their SMP/E client certificates to use Root CA with SHA256. I think it is reasonable to ask, that IBM also updates their certificates.

Idea priority Medium
  • Guest
    Reply
    |     Feb 26, 2024
    The issuing intermediate CA for IBM's Automated Service Request server used by SMP/E RECEIVE ORDER (eccgw01.boulder.ibm.com) is a SHA-256 certificate, even though the root CA is a SHA-1 certificate.

    A trust chain is built by verifying the issuer of the certificate up to the root CA, which is pre-trusted by definition, unlike the verification process performed for the intermediate CA(s). That is why SHA-1 root CAs are still widely used in many well-known Certificate Authorities.

    When the IBM server certificate expires IBM will request a new certificate originating from a stronger root CA.

    Here is the complete chain currently:
    - The root cert's signature uses the SHA-1 with RSA algorithm. This is DigiCert Global Root CA. This signature does not need to be verified, as it is a root CA and is pre-trusted.
    - The intermediate cert's signature uses SHA-256 with RSA. This is DigiCert TLS RSA SHA2456 certificate. This is the issuer of the IBM server cert, and is the one that matters in this chain.
    - The IBM server's cert's signature uses SHA-256 with RSA.

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