The term Trust Services stands for all services which concern communication trustability over open networks (e.g. internet). This ranges from a pure channel encryption over several mechanisms for the identification of the communication partners to a complete solution for Virtual Private Networks or Single Sign On. For the identification methods (e.g. Mobile TAN, electronic signature) it is also important how they are issued (registration). Profound knowledge about the market environment and an accurate analysis of the customer's framework are required in order to profit from the trust services' potential and to ensure the applications' profitability.