In the age of globalization and social media, Europe is facing a new wave of terrorism. Most often, the jihadists are associated with the Islamic State (IS). Their number is growing rapidly due to massive online propaganda. But how exactly is radicalization promoted by the Islamic State? What are the challenges for security authorities? Tobias Mattes explains recent findings of radicalization research. Moreover, he analyses the online magazine "Rumiyah" in order to find out which triggers promote radicalization. His publication helps to understand the messages propagated through this magazine and how this knowledge can be used by governmental agencies for a counter-strategy against Islamic State's radicalization attempts in online jihad. In this book: - Radicalization; - Islamic State; - Jihad; - Terrorism; - Deradicalization; - Online propaganda