DOA-Trusted Cloud 2013 is the third International Symposium on Secure Virtual Infrastructures, organized as a component conference of the OnTheMove Federated Conferences & Workshops. Current and future software needs remain focused towards the development and deployment of large and complex intelligent and networked information systems, required for the internet- and intranet-based systems in organizations, and covering a very wide range of application domains as well as technology and research issues.