We often consider data security to include confidentiality, so security and privacy are generally seen as being two sides of the same coin. If we broaden security to concerns about terrorism and serious crime, then increases in security often come at the expense of reduced privacy. Similarly, companies wishing to personalize the services offered to customers often infringe on the privacy of individuals. Actions by agencies can be direct and targeted at individual suspects or may be more generally applied. An example of a broader targeting approach is the amalgamation and analysis of content across social network sites in an attempt to identify anomalous behavior and predict intent. Although the various actors may have benign objectives, understanding the relationship between security and privacy is imperative to ensure against malign abuses. The core questions include the following: Can we develop an appropriate measure of the risks involved when security and privacy are traded off against each other? Is a sociological shift in expectations on privacy possible? Are there ways of robustly modeling such issues with a view to optimizing the balance between security and privacy? This problem requires collaboration between computer scientists, philosophers, and social scientists. In this symposium, we will explore ways to balance security and privacy, especially in today’s interconnected world in which different countries may have different notions of security and privacy.