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Automotive embedded systems now include numerous software-intensive functions that are critical from a safety point of view (e.g., braking, assisted driving, etc). These functions are distributed on the Electronic Control Units and they need to exchange large amount of data with real-time constraints. In this context, the communication system plays a major role and it has to respect stringent dependability constraints. Security, especially with the widespread of wireless networks, is now becoming a serious matter of concern too. In this talk, we will review the main threats to dependability and security in automotive communication systems, the existing technical solutions to attain them, and, highlight areas where developments might be needed.