Increased adoption of mobile communications technologies (e.g., smartphones and Internet tablets), along with the growing popularity of mobile applications and online social network services (e.g., mobile Facebook, Foursquare, mobile YouTube), dramatically changed the computing and networking landscapes. Such mobile environments, while creating and promoting several new opportunities for users, businesses and enterprises by complementing and often supplanting traditional Internet communication, opened up new challenges with new forms of security risks and privacy threats. Mobile devices security and privacy research has been very active and productive since the inception of smartphones and app markets. Both regulatory and technology efforts are also underway to address some of the privacy and security requirements of mobile systems and services. The workshop will discuss issues in mobile devices and applications, mobile location-based services, ad-hoc and infrastructure-based mobile networks, with particular focus on theoretical and practical aspects of design, usability and performance evaluation of security and privacy. This workshop will solicit research papers, work-in-progress papers, industry and regulatory position reports from academia, industry, and government agencies. The proposed workshop seeks to promote dynamic interdisciplinary discussions and collaboration on the various aspects of security and privacy of mobile devices, applications and mobile networking operations.