I noticed that the postgis23_96-2.3.3-1 RPM is not signed. It is strange
that it was updated on 7/24/2017 since it is an older version.
This is the URL I got the RPM from:
https://download.postgresql.org/pub/repos/yum/9.6/redhat/rhel-7-x86_64
And this is the exact package.
postgis23_96-2.3.3-1.rhel7.x86_64.rpm 2017-Jul-24 08:25:04 4.1M
application/x-redhat-package-manager
Regards,
Jeff Hastings