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During disasters, existing telecommunication infrastructures are often congested or even destroyed. In these situations, mobile devices can be interconnected using wireless ad hoc and disruption-tolerant networking to establish a backup emergency communication system for civilians and emergency services. When available, a connection to cloud services in the Internet is a valuable aid in crisis and disaster management. However, such communication systems entail serious security risks, sincedoi:10.17192/z2019.0044 fatcat:n7vxw37ogbb7pjnvc6sd4q6fqu