BACKGROUND Electronic disease surveillance systems can be extremely valuable tools; however, a critical step in system implementation is collecting data. Without accurate and complete data, statistical anomalies that are detected hold little meaning. Many people who have established successful surveillance systems acknowledge the initial data collection process to be one of the most challenging...

Detailed data collection of individuals is a fundamental requirement for profound statistical analysis of a complex system as the health care system of Switzerland. The aim of this report is to model a privacy-preserving data collection system, to analyze an already proposed implementation and to develop a new proposal giving highest security.