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Smart Home Personal Assistants (SPA) are an emerging innovation that ischanging the way in which home users interact with the technology. However,there are a number of elements that expose these systems to various risks: i)the open nature of the voice channel they use, ii) the complexity of theirarchitecture, iii) the AI features they rely on, and iv) their use of awide-range of underlying technologies. This paper presents an in-depth reviewof the security and privacy issues in SPA, categorizing the most importantattack vectors and their countermeasures. Based on this, we discuss openresearch challenges that can help steer the community to tackle and addresscurrent security and privacy issues in SPA. One of our key findings is thateven though the attack surface of SPA is conspicuously broad and there has beena significant amount of recent research efforts in this area, research has sofar focused on a small part of the attack surface, particularly on issuesrelated to the interaction between the user and the SPA devices. We also pointout that further research is needed to tackle issues related to authorization,speech recognition or profiling, to name a few. To the best of our knowledge,this is the first article to conduct such a comprehensive review andcharacterization of the security and privacy issues and countermeasures of SPA.

Smart Home Personal Assistants: A Security and Privacy Review