Towards reactive acoustic jamming for personal voice assistants

Peng Cheng, Ibrahim Ethem Bagci, Jeff Yan, Utz Roedig

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

2 Citations (Scopus)

Abstract

Personal Voice Assistants (PVAs) such as the Amazon Echo are commonplace and it is now likely to always be in range of at least one PVA. Although the devices are very helpful they are also continuously monitoring conversations. When a PVA detects a wake word, the immediately following conversation is recorded and transported to a cloud system for further analysis. In this paper we investigate an active protection mechanism against PVAs: reactive jamming. A Protection Jamming Device (PJD) is employed to observe conversations. Upon detection of a PVA wake word the PJD emits an acoustic jamming signal. The PJD must detect the wake word faster than the PVA such that the jamming signal still prevents wake word detection by the PVA. The paper presents an evaluation of the effectiveness of different jamming signals. We quantify the impact of jamming signal and wake word overlap on jamming success. Furthermore, we quantify the jamming false positive rate in dependence of the overlap. Our evaluation shows that a 100% jamming success can be achieved with an overlap of at least 60% with a negligible false positive rate. Thus, reactive jamming of PVAs is feasible without creating a system perceived as a noise nuisance.

Original languageEnglish
Title of host publicationMPS '18
Subtitle of host publicationProceedings of the 2nd International Workshop on Multimedia Privacy and Security, co-located with CCS 2018
Place of PublicationNew York, NY
Pages12-17
Number of pages6
ISBN (Electronic)9781450359887
DOIs
Publication statusPublished - 15 Oct 2018
Event2nd International Workshop on Multimedia Privacy and Security, MPS 2010, co-located with CCS 2018 - Toronto, Canada
Duration: 15 Oct 2018 → …

Conference

Conference2nd International Workshop on Multimedia Privacy and Security, MPS 2010, co-located with CCS 2018
Country/TerritoryCanada
CityToronto
Period15/10/18 → …

Keywords

  • acoustic privacy
  • reactive acoustic jamming
  • security and privacy in IoT
  • wake word detection

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