Abstract
Computer-assisted speech mimicking is not only interesting but is
also a security threat. It involves the transformation of the speech
produced by one speaker into the speech seemingly spoken by another
speaker. We have built such a system that can be used to attack text
prompted speaker verification systems by producing concatenated speech
from authentic speech waveform segments of the impersonation target. The
technique is based on the replacement of waveform segments of the
impostor's speech with the corresponding waveform segments of the target
speech. This paper presents two automatic speech mimicking algorithms
that are based on the variable-length waveform segment replacement
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