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Status Not under consideration
Workspace z/OS
Categories Order/Distr/Install
Created by Guest
Created on Mar 15, 2023

RELATED IDEAS

Strengthen the Certificate that authenticates SMP/E Download-Servers (deliverycb-bld.dhe.ibm.com/ deliverycb-mul.dhe.ibm.com)

The Root-Certificate used to sign the Server-Certificates for the SMP/E Download Servers (deliverycb-bld.dhe.ibm.com/ deliverycb-mul.dhe.ibm.com) has been created with an old SHA1 algorithm.

We would like to ask, if you could create new Server-Certificates and have them signed with a newer and more secure Root-Certificate.



Idea priority Medium
  • Guest
    Reply
    |     Apr 17, 2023
    In fact, the issuing CA of the SMP/E Download-Server is a SHA-256 certificate, although 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 involves in the intermediate CA(s). That?s why SHA-1 root CAs are still widely used in many well-known CAs.

    When IBM switches to request all certificates originate from a stronger root CA, SMP/E usage would be amongst all the other IBM products to get such certificate. It would be a corporate-wide policy, and not specific to these specific download servers.

    Here is the complete chain today:
    ? The root cert's signature uses the SHA-1 with RSA algorithm. This is our DigiCert Global Root CA. This signature does not need to be verified, as it is root CA and is pre-trusted.
    ? The intermediate cert's signature uses SHA-256 with RSA. This is our 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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