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Security in vehicular networks established itself as a highly active research area in the last few years. However, there are only a few results so far on assuring security for communication buses inside vehicles. Here we advocate the use of a protocol based entirely on simple symmetric primitives that takes advantage of two interesting procedures which we call key splitting and MAC mixing. Rather than achieving authentication independently for each node, we split authentication keys between groups of multiple nodes. This leads to a more efficient progressive authentication that is effective especially in the case when compromised nodes form only a minority and we believe such an assumption to be realistic in automotive networks. To gain more security we also account an interesting construction in which message authentication codes are amalgamated using systems of linear equations. We study several …