The Secure Storage service for the gLite middleware provides users with a set of tools to store in a secure way and in an encrypted format confidential data (e.g. medical or financial data) on the Grid storage elements. The data stored though provided tools will be accessible and readable by authorized users only. Moreover, it solves the Insider abuse problem preventing also the administrators of the storage elements to access the confidential data in a clear format. The service has been designed and developed for the grid middleware of the EGEE Project, gLite, in the context of the TriGrid VL Project.