An intelligent transportation system, ITS, station (600) comprising: a host processor (640); and a memory (664) operably coupled to the host processor (640). The host processor (640) is configured to: perform verification per identity that includes precomputation of data for a plurality of neighbouring ITS stations of the ITS station (600); store precomputation data for the verified identity of the plurality of neighbouring ITS stations in the memory (664); and extract from memory (664) and use the stored precomputation data for a respective neighbouring ITS station to perform an accelerated verification of a subsequent message received from that neighbouring ITS station.