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Your phone contacts, text messages, calendar entries and social media details are all gathered by the app and it also searches for over 73,000 specific files. Prof Thorsten Holz, faculty of electrical engineering and IT at Ruhr-Universität Bochum, and one of his PhD students explain what the app does and how it can be broken into. (Photo: Breaking into the Chinese surveillance app: what data were they looking for? Credit: © Mareen Meyer.)