Because of its ultra-light weight block cipher, Trillium’s SecureCAN can encrypt CAN (and LIN) messages in real time, claimed Uze.

Source: www.eetimes.com

Is CAN encryption (or lack of it) the issue? I think the rest of the ECU’s in he car would need modification. A CAN firewall is another proposed solution. It is clear the designers of CAN never envisioned 2015.