Matthew Longo is Assistant Professor of Political Science at Leiden University. Previously, he was the Clayman Junior Research Fellow in Politics and Political Ideas at St Anne's College, Oxford. He received his Ph.D. with distinction from Yale University, Connecticut in 2014 and was awarded the American Political Science Association's Leo Strauss Award for the Best Doctoral Dissertation in Political Philosophy. His work has been published in the American Journal of Political Science and Democratization, the New York Times and the Los Angeles Times, and has been featured in the Washington Post and National Public Radio.

'Beautifully written, Matthew Longo's book opens our eyes to the transformation of state borders in an era of new security technologies and big data. Longo's approach is rather unique in its combination of anthropological fieldwork and normative argument. His target audience is not any academic discipline, it is citizens who want to understand the new threats to their freedom, and do something about it too.' Rainer Bauböck, European University Institute, Florence

• Introduction; 1. Borders: thick and thin; Part I. The Perimeter: 2. The wall and its shadow: security in the borderlands; 3. Co-bordering: one border, two sovereigns?; 4. A global question: co-bordering, cosmopolitanism, and the spectre of empire; Part II. The Ports of Entry: 5. The tiniest constable: big data, security, and the politics of identification; 6. Sovereignty, security, and the politics of trust; 7. Into the digital dark: data, the global firewall, and the future of security.

Matthew Longo is Assistant Professor of Political Science at Leiden University. Previously, he was the Clayman Junior Research Fellow in Politics and Political Ideas at St Anne's College, Oxford. He received his Ph.D. with distinction from Yale University, Connecticut in 2014 and was awarded the American Political Science Association's Leo Strauss Award for the Best Doctoral Dissertation in Political Philosophy. His work has been published in the American Journal of Political Science and Democratization, the New York Times and the Los Angeles Times, and has been featured in the Washington Post and National Public Radio.

'Beautifully written, Matthew Longo's book opens our eyes to the transformation of state borders in an era of new security technologies and big data. Longo's approach is rather unique in its combination of anthropological fieldwork and normative argument. His target audience is not any academic discipline, it is citizens who want to understand the new threats to their freedom, and do something about it too.' Rainer Bauböck, European University Institute, Florence

• Introduction; 1. Borders: thick and thin; Part I. The Perimeter: 2. The wall and its shadow: security in the borderlands; 3. Co-bordering: one border, two sovereigns?; 4. A global question: co-bordering, cosmopolitanism, and the spectre of empire; Part II. The Ports of Entry: 5. The tiniest constable: big data, security, and the politics of identification; 6. Sovereignty, security, and the politics of trust; 7. Into the digital dark: data, the global firewall, and the future of security.

Matthew Longo is Assistant Professor of Political Science at Leiden University. Previously, he was the Clayman Junior Research Fellow in Politics and Political Ideas at St Anne's College, Oxford. He received his Ph.D. with distinction from Yale University, Connecticut in 2014 and was awarded the American Political Science Association's Leo Strauss Award for the Best Doctoral Dissertation in Political Philosophy. His work has been published in the American Journal of Political Science and Democratization, the New York Times and the Los Angeles Times, and has been featured in the Washington Post and National Public Radio.

'Beautifully written, Matthew Longo's book opens our eyes to the transformation of state borders in an era of new security technologies and big data. Longo's approach is rather unique in its combination of anthropological fieldwork and normative argument. His target audience is not any academic discipline, it is citizens who want to understand the new threats to their freedom, and do something about it too.' Rainer Bauböck, European University Institute, Florence

• Introduction; 1. Borders: thick and thin; Part I. The Perimeter: 2. The wall and its shadow: security in the borderlands; 3. Co-bordering: one border, two sovereigns?; 4. A global question: co-bordering, cosmopolitanism, and the spectre of empire; Part II. The Ports of Entry: 5. The tiniest constable: big data, security, and the politics of identification; 6. Sovereignty, security, and the politics of trust; 7. Into the digital dark: data, the global firewall, and the future of security.