Under CopyrightBittl, SebastianSebastianBittlRoscher, KarstenKarstenRoscher2022-03-1325.5.20162016https://publica.fraunhofer.de/handle/publica/39200810.24406/publica-fhg-392008Wireless ad hoc networks are an important topic in the automotive domain. Thereby, strict security requirements lead to high effort for verification of digital signatures used to secure message exchange. A popular approach to limit such effort is to apply verify-on-demand schemes. However, we show that verify-on-demand requires much more cross layer dependencies than identified before. Moreover, a massive denial of service weakness of this kind of verification mechanism is found. Thus, we recommend to prefer verify-all schemes over their verify-on-demand counterparts.envehicular ad hoc networkVANETverify-on-demandsecuritywireless networkvehicular ad hoc networkautomotiveautomotive connectivity621conference paper