Just in case it could help anyone else, I also discovered that I could have 
used this callable service to encipher the response:

Encode (CSNBECO and CSNEECO)
Use the encode callable service to encipher an 8-byte string using a clear key. 
The
callable service uses the electronic code book (ECB) mode of the DES. (This
service is available only on a DES-capable system.)

This service only allows eight bytes of clear text to be enciphered using an 
eight byte clear key, but that was just what I wanted to do.

Regards,
John.

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