Information security is a critical concern in a wide range of embedded computing and communications systems. Embedded systems are being used in critical applications (medical electronics, automotive systems, and avionics), where the consequence of security attacks can be severe. Several business models (e.g., distribution of multimedia content, mobile e-commerce, etc.) require an adequate level of security in the associated electronic systems in order to be viable. On the other hand, the increasing complexity and networked nature of embedded systems has led to many vulnerabilities or weaknesses that can be easily targeted for security attacks. IBM?s Global Business Security Index Report (2005) projected "the aggressive spread of viruses and worms to handheld devices, cell phones, wireless networks, car and satellite systems, and other embedded computers", as a major emerging trend.