ISCA Archive Interspeech 2013
ISCA Archive Interspeech 2013

Secure binary embeddings of front-end factor analysis for privacy preserving speaker verification

José Portêlo, Alberto Abad, Bhiksha Raj, Isabel Trancoso

Remote speaker verification services typically rely on the system to have access to the users recordings, or features derived from them, and also a model of the users voice. This conventional scheme raises several privacy concerns. In this work, we address this privacy problem in the context of a speaker verification system using a factor analysis based front-end extractor, the so-called i-vectors. Speaker verification without exposing speaker data is achieved by transforming speaker i-vectors to bit strings in a way that allows the computation of approximate distances, instead of exact ones. The key to the transformation uses a hashing scheme known as Secure Binary Embeddings. Then, a modified SVM kernel permits operating on the i-vector hashes. Experiments on sub-sets of NIST SRE 2008 showed that the secure system yielded similar results as its non-private counterpart.


doi: 10.21437/Interspeech.2013-417

Cite as: Portêlo, J., Abad, A., Raj, B., Trancoso, I. (2013) Secure binary embeddings of front-end factor analysis for privacy preserving speaker verification. Proc. Interspeech 2013, 2494-2498, doi: 10.21437/Interspeech.2013-417

@inproceedings{portelo13_interspeech,
  author={José Portêlo and Alberto Abad and Bhiksha Raj and Isabel Trancoso},
  title={{Secure binary embeddings of front-end factor analysis for privacy preserving speaker verification}},
  year=2013,
  booktitle={Proc. Interspeech 2013},
  pages={2494--2498},
  doi={10.21437/Interspeech.2013-417}
}