Revisiting the security of speaker verification systems against imposture using synthetic speech

In this paper, we investigate imposture using synthetic speech. Although this problem was first examined over a decade ago, dramatic improvements in both speaker verification (SV) and speech synthesis have renewed interest in this problem. We use a HMM-based speech synthesizer which creates syntheti...

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Bibliographic Details
Main Authors: De Leon, Phillip L, Apsingekar, Vijendra Raj, Pucher, Michael, Yamagishi, Junichi
Format: Conference Proceeding
Language:English
Subjects:
Covariance matrix
Hidden Markov models
Kernel
Security
Signal synthesis
Speaker recognition
Speech synthesis
Support vector machine classification
Support vector machines
Synthesizers
System testing
Online Access:Request full text
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Summary:In this paper, we investigate imposture using synthetic speech. Although this problem was first examined over a decade ago, dramatic improvements in both speaker verification (SV) and speech synthesis have renewed interest in this problem. We use a HMM-based speech synthesizer which creates synthetic speech for a targeted speaker through adaptation of a background model. We use two SV systems: standard GMM-UBM-based and a newer SVM-based. Our results show when the systems are tested with human speech, there are zero false acceptances and zero false rejections. However, when the systems are tested with synthesized speech, all claims for the targeted speaker are accepted while all other claims are rejected. We propose a two-step process for detection of synthesized speech in order to prevent this imposture. Overall, while SV systems have impressive accuracy, even with the proposed detector, high-quality synthetic speech will lead to an unacceptably high false acceptance rate.
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.2010.5495413