What program Network Security Platform or Hips? This so i can move the post to a better forum. I would assume NSP
There is no 'other way' of doing SSL decryption on NSP other than enabling the decryption settings on the sensor (requires a reboot) and load and push the certificates to the sensor to decrypt the HTTPS traffic.
I am going to echo what David has already said. There is no other method with just the NSP to decrypt SSL flows. However, if you are behind a proxy...then the proxy can forward the unencrypted flows to sensor.