Controlling encryption and decryption processing

TRANSMIT and RECEIVE provide encryption and decryption options. By setting an installation default in the INMXPARM CSECT, you can require that all transmitted data be encrypted, give users the option of encrypting data, or prohibit encryption. Setting up the TRANSMIT and RECEIVE environment describes how to specify defaults in INMXPARM.

If you allow encryption, and have MVS™ Programmed Cryptographic Unit Support Program installed, TRANSMIT and RECEIVE use the Access Methods Services REPRO function to encipher and decipher the data. Before invoking the service, TRANSMIT or RECEIVE gives control to either the TRANSMIT encryption or the RECEIVE decryption exit. Those exits can:

Modify the ENCIPHER or DECIPHER options that the user specified
Invoke encryption or decryption processing themselves
Prevent the data set from being encrypted or decrypted