In order to explore critical infrastructure protection and the changing forms of security, this chapter discusses literature on the relationship between security, sovereignty and borders, further making the case for focusing on 'critical infrastructure protection' (CIP). It sets the stage for the actual analysis of the CIP discourse. The analysis is focused on exploring how policies are argued by the US administration in trying to make security inside sovereign space. This analysis consists of three parts: first, discusses the history of CIP; second investigates how domestic space both limits sovereign power and empowers new private actors. Third looks at how the US administration tries to combine the concepts of risk and protection in the rationalization of its security strategy in relation to CIP policies. The chapter analyses the struggle for conceptual coherence concerning the concepts of security, and thus, ultimately, sovereignty, as negotiation and probability are incorporated into the security strategies of the state.