This article introduces the main principles and the design of a system for identifying terroristic indicators and predicting terroristic actions based on processing of information from social media and the dark web. The presented system (which is conveniently called VIGILANT) is aimed at responding to recent challenges stemming from the increased exploitation of the internet by terroristic groups, as a means of conducting psychological warfare, gaining publicity, spreading propaganda, mining/collecting information about their targets, raising funds for their activities, recruiting and mobilizing supporters, as well as planning and coordinating their attacks. The article is not confined to the presentation of the technical design of a platform for social media and dark web information processing, but discusses legal and privacy aspects as well.
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