Although many transport and logistics companies have tracking and tracing systems, these systems typically are proprietary solutions. At the same time, supply chains are becoming increasingly complex, involving multiple carriers and transport modes. Accurate, up-to-date information exchange across different carriers and modes of transport is in high demand. The objective of the European project ParcelCall is the development of an open and standardized architecture for seamless tracking and tracing across the entire logistics and transportation chain. Security issues that arise in this context are discussed.