In this work we study the need of template protection to provide security
and privacy in text-dependent pass-phrase voice authentication systems.
For this purpose, we analyze the robustness of two state-of-the-art
speaker verification systems against attacks performed using input
data generated from a compromised voice template. This analysis shows
that compromised templates can be used to gain unauthorized access
to authentication systems, when these systems use the same speaker
verification technology, background models and pass-phrase as the one
from which the compromised template was stolen. However we also show
that the compromised template may not be helpful to attack an authentication
system which uses a speaker verification technology or pass-phrase
different from those considered in the system the template was obtained
from. This fact facilitates the fulfillment of the main requirements
that a protected template should meet to guarantee user privacy: irreversibility
Finally we propose a set of guidelines for the design of voice authentication systems that enable the preservation of user privacy and provide revocability measures in case a template is compromised.
Bibliographic reference. Vaquero, Carlos / Rodríguez, Patricia (2015): "On the need of template protection for voice authentication", In INTERSPEECH-2015, 219-223.