Abstract:
The development in digital technologies and
advanced speech analysis/synthesis tools these days
enable speech signals to be tampered without leaving
any perceptual clues. As an important information
carrier, the integrity of speech signals should be
strictly confirmed and digital watermarking can be
used for this purpose. In this paper, a self-embedding
speech watermarking scheme is proposed for
detection of unauthorized manipulation (tampering)
and localization. Firstly, hash code is generated from
original speech signal and then this hash code (as a
watermark) is embedded directly into the signal itself
without affecting the original quality. Once tampering
occurred, the watermark in the tampered segment
should be destroyed and thus the receiver can detect
the tampered position. Experimental results show that
the proposed method provides not only inaudibility
and blindness but also fragility against tampering and
detects the position of tampering.
