Resolution:
TIBCO Runtime Adapter 5.4.2 Hotfix 7 and TIBCO 5.5 have a defect correction directly related to BusinessConnect 5.X.  If TIBCO BusinessConnect was configured to use AES encryption algorithm with strong ciphers (AES-192 and AES-256), it would fall back to using 128-bit keys (AES-128) when encrypting messages.  Because of the underlying protocols, encrypted transactions would still be completed successfully, albeit with a lower level of encryption.

This hotfix/service pack will correct this issue for BusinessConnect installation using TRA 5.4 and TRA 5.5.