Detecting covert dubious actors using cross domain associations

National Security has become a big challenge of the 21st century. Undetected suspicious individuals, hiding among normal population, disguising themselves as normal people yet maybe involved in terrorist activities silently. Such individuals are called sleepers and from sleeping terrorist cells. It is a very difficult task to identify such individuals. Two or more individuals, who want to have an interaction to participate in a suspicious activity, may not have a direct link rather they may be use other individuals and different modes of association to establish a link between them. The aim of this paper is to propose a novel idea to identify such individuals/group with different association between members which may not be observed under normal circumstances.