  The aim of the Nu.Sa. project is the definition of national level data
standards to collect data coming from General Practitioners' Electronic Health
Records and to allow secure data sharing between them. This paper introduces
the Nu.Sa. framework and is mainly focused on security issues. A solution for
secure data sharing and service interoperability is presented and implemented
in the actual system used around Italy. The solution is strongly focused on
privacy and correct data sharing with a complete set of tools devoted to
authorization, encryption and decryption in a data sharing environment and a
distributed architecture. The implemented system with more than one year of
experiences in thousands of test cases shows a good feasibility of the approach
and a future scalability in a cloud based architecture.
