Re-assessing the threat of replay spoofing attacks against automatic speaker verification

Alegre, Federico; Evans, Nicholas; Janicki, Artur
BIOSIG 2014, 13th International Conference of the Biometrics Special Interest Group, 10-12 September 2014, Darmstadt, Germany

This paper re-examines the threat of spoofing or presentation attacks in the
context of automatic speaker verification (ASV). While voice conversion and speech
synthesis attacks present a serious threat, and have accordingly received a great deal
of attention in the recent literature, they can only be implemented with a high level
of technical know-how. In contrast, the implementation of replay attacks require no
specific expertise nor any sophisticated equipment and thus they arguably present a
greater risk. The comparative threat of each attack is re-examined in this paper against
six different ASV systems including a state-of-the-art iVector-PLDA system. Despite
the lack of attention in the literature, experiments show that low-effort replay attacks
provoke higher levels of false acceptance than comparatively higher-effort spoofing
attacks such as voice conversion and speech synthesis. Results therefore show the
need to refocus research effort and to develop countermeasures against replay attacks
in future work.

Sécurité numérique
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