Cross-layer Secure Transmission Protocol of VANET Based on Random Frequency Hopping Diversity
To prevent the eavesdropping in existing VANET( Vehicular Ad-hoc Network),the cross-layer security routing protocol based frequency diversity is presented in this paper. When building the routing in network layer,according to the positions of nodes,the protocol limited the broading rage of node geographical position. As a result,the nodes,except to the source node and the destination node,cannot gain the whole channel information about routings and channel states. Then. the channel states is transparently transmitted from network layer to physical layer,on which the random frequency diversity is adopted,to make the receiving constellation of eavesdropper disheveled. Finally,the eavesdropper cannot recover the information,which means the security of information transmission is gained.