As telecoms move towards cloud-based models to affordably handle the wave of newly connected devices, thanks to 5G and the Internet of Things (IoT) trend, security of such critical infrastructure has never been more important in order to meet government regulations. In particular, network security services are gaining momentum as a key use case for Network Function Virtualization (NFV), giving operators the opportunity to offer universal security protection for heterogeneous clients. However, outsourcing security to the edge of the network raises a number of security and privacy concerns requiring a great deal of faith and trust from the tenant as they must rely on the edge to perform correct enforcement of security policies. This talk will report on the progress of the SECURED project for leveraging NFV as a security gateway for the IoT, and will describe the trust architecture used to deliver assurance to end tenants of its proper operation.