Towards the paramount objective of covering the entire ITS reference model with security and privacy measures, Hagen Stübing develops dedicated solutions for each layer, respectively. On application layer a security architecture in terms of a Public Key Infrastructure is presented, which provides low complexity and operational costs, while at the same time security and privacy constraints are preserved. On facility layer complementary security solutions based on mobility data verification are proposed, which promise efficient message content protection at a low computational complexity. On network layer a privacy protocol is presented aiming at a creation of cryptographic mix zones by means of group keys, which enhance privacy towards a global adversary. On physical layer a technique denoted as Secure C2X Beamforming is presented, which enhances privacy and security by means of radiation pattern control.