This was an excellent read, and had the technical meat I was looking for. Too much actually, my eyes started glazing over during the CAN protocol checksum part.

This was an excellent read, and had the technical meat I was looking for. Too much actually, my eyes started glazing over during the CAN protocol checksum part. It was a hair-raising experience learning that up until recently thousands of cars' head units could be controlled remotely at any given time by telneting to port 6667 (irc, hah!) and sending unauthenticated D-Bus commands over the Sprint 3G IP network.