NXP's secure over-the-air communication for automotive networks features embedded hardware crystallographic engine for the rapid decryption of received data.
Features
OTA Encryption Decryption Cypher Block encoding.
This needs a more complete description provided from Automotive group to explain the details of why/what is happening. Essentially this shows two different types of encryption schemes on the Automotive processors. The visual shows that one form of encoding even though encrypted, still "reveals" some details of the original image (you can see the outline of the freescale logo for example) as hence isn't really as secure as the second method.