EDIINT Processing only SignedEncrypted Files

We are using the EDIINT/TN 6.0.1 setup. I’d like to be able to process only signed/encrypted files and reject the rest. How can this be accomplished as the security verification process is within the EDIINT package and it accepts both plain (unsecured) and secured files.
I’d like not to change the standard EDIINT processing service.

There is a fix available for this issue - EDIINT_601_Fix1