A Cooperative Message Authentication Protocol in VANETs
Safety provision is a crucial application for the Vehicular Ad hoc NETworks (VANETs). In the VANETs, vehicles periodically broadcast their geographic information. Therefore, collisions can be avoided. In this paper, the authors address the issue of large computation overhead caused by the safety message authentication. A Cooperative Message Authentication Protocol (CMAP) is presented to alleviate vehicles' computation burden. In the protocol, because vehicles share their verification results with each other in a cooperative way, the number of safety messages that each vehicle needs to verify will be reduced greatly. A new research issue of the protocol is how to select verifiers in the city road scenario.