Abstract: | The spread and development of e-Government services caused significant interest in maintaining security, trust and privacy. This paper presents a state-of-the-art review of the widely accepted Privacy Enhancing Technologies (PETs). A strict classification of several parameters is performed in order to conduct a comparative analysis among Anonymizer, Crowds, Onion Routing, TRUSTe, P3P, LPWA, Hordes and Freedom. The selection of the comparison criteria is relevant to Security Threats, Technological Issues and User Demands. |