With the proliferation of many innovative data communications services such as social networks, cloud computing, location‐based service, and Internet of Things, security and privacy issues become more and more demanding and challenging. This symposium aims to bring together academics and industry professionals working on the security and privacy aspects of data communications and computer networks, and provide a forum to present and discuss emerging ideas, progresses and Trends in this highly challenging research field. Topics of interest include, but are not limited to: Privacy and security in mobile and wireless communications Privacy and security in grid and cloud computing Privacy and security in pervasive and ubiquitous computing Privacy and security in location‐based service Privacy and security in social networks Privacy and security in Internet of Things Key management and Public Key Infrastructures Intrusion detection and protection systems