Write an executive technical report outlining the threats and possibilities of security on the Internet of Things (IoT). This report should cover low level hardware and software threats and vulnerabilities, giving actual examples. This should be followed by some of the ways these attacks can be defended against for example features such as arms TrustZone. The report should be structured as follows: background and overview of IoT, threats and vulnerabilities, defence strategies and recommendations for future systems. The report should be around 1500 words long. There should be full references made to commercial, technical and academic material.